Encapsulated Corrosion Inhibitors For Eco Benign Smart Coatings

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Encapsulated Corrosion Inhibitors for Eco-Benign Smart Coatings

Author : Ashish Kumar
Publisher : CRC Press
ISBN 13 : 1040090338
Total Pages : 379 pages
Book Rating : 4.0/5 (4 download)

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Book Synopsis Encapsulated Corrosion Inhibitors for Eco-Benign Smart Coatings by : Ashish Kumar

Download or read book Encapsulated Corrosion Inhibitors for Eco-Benign Smart Coatings written by Ashish Kumar and published by CRC Press. This book was released on 2024-08-05 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers all the recent advancements and technologies developed for encapsulated corrosion inhibitors-based coatings by using eco-benign and sustainable encapsulated smart coatings based on self-healing functionality. It includes overview of properties and applicability of encapsulated inhibitors, methodologies to detect corrosion, and recent developments made in the field of corrosion science to study the inhibition potential of encapsulated corrosion inhibitors for eco-benign smart coatings in several corrosive systems. Features: Covers encapsulation of the corrosion inhibitor which explores the self-healing mechanism of the smart coatings. Includes encapsulated corrosion inhibitor fabrication, synthesis, modeling, functionalization, classification, characteristics, and so forth. Reviews effectiveness and significant constraints of scale-up engineering. Discusses the fundamental characteristics of industrial-scale application research for encapsulated corrosion inhibitors. Explores entire aspects of encapsulated corrosion inhibitors-based sustainable smart coatings in one place. This book is aimed at researchers and graduate students of corrosion engineering, surface engineering, and chemistry engineering.

Eco-Friendly Corrosion Inhibitors

Author : Lei Guo
Publisher : Elsevier
ISBN 13 : 0323998429
Total Pages : 578 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Eco-Friendly Corrosion Inhibitors by : Lei Guo

Download or read book Eco-Friendly Corrosion Inhibitors written by Lei Guo and published by Elsevier. This book was released on 2022-06-21 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eco-Friendly Corrosion Inhibitors: Principles, Designing, and Applications wraps up new developments in corrosion inhibitors and their current applications in real-life environments such as in strong acidic pickling and petroleum-based liquids. The book covers several types of environmentally-friendly corrosion inhibitors in detail. In addition, it highlights both established research and technology on industrial scale corrosion inhibitors and their rapidly emerging aspects and future research directions. Provides fundamental basics and applied practices of corrosion prevention at industrial scale Serves as a valuable reference for scientists and engineers who are searching modern design for industrial scale corrosion inhibitors Focuses on the most advanced industrial scale corrosion inhibitors, including current challenges during manufacturing Includes up-to-date reference material such as websites of interest and information about the latest research

Handbook of Smart Coatings for Materials Protection

Author : Abdel Salam Hamdy Makhlouf
Publisher : Elsevier
ISBN 13 : 0857096885
Total Pages : 659 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Handbook of Smart Coatings for Materials Protection by : Abdel Salam Hamdy Makhlouf

Download or read book Handbook of Smart Coatings for Materials Protection written by Abdel Salam Hamdy Makhlouf and published by Elsevier. This book was released on 2014-02-22 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: A smart coating is defined as one that changes its properties in response to an environmental stimulus. The Handbook of Smart Coatings for Materials Protection reviews the new generation of smart coatings for corrosion and other types of material protection. Part one explores the fundamentals of smart coatings for materials protection including types, materials, design, and processing. Chapters review corrosion processes and strategies for prevention; smart coatings for corrosion protection; techniques for synthesizing and applying smart coatings; multi-functional, self-healing coatings; and current and future trends of protective coatings for automotive, aerospace, and military applications. Chapters in part two focus on smart coatings with self-healing properties for corrosion protection, including self-healing anticorrosion coatings for structural and petrochemical engineering applications; smart self-healing coatings for corrosion protection of aluminum alloys, magnesium alloys and steel; smart nanocoatings for corrosion detection and control; and recent advances in polyaniline-based organic coatings for corrosion protection. Chapters in part three move on to highlight other types of smart coatings, including smart self-cleaning coatings for corrosion protection; smart polymer nanocomposite water- and oil-repellent coatings for aluminum; UV-curable organic polymer coatings for corrosion protection of steel; smart epoxy coatings for early detection of corrosion in steel and aluminum; and structural ceramics with self-healing properties. The Handbook of Smart Coatings for Materials Protection is a valuable reference for those concerned with preventing corrosion, particularly of metals, professionals working within the surface coating industries, as well as all those with an academic research interest in the field. - Reviews the new generation of smart coatings for corrosion and other types of material protection - Explores the fundamentals of smart coatings for materials protection including types, materials, design, and processing - Includes a focus on smart coatings with self-healing properties for corrosion protection

Intelligent Coatings for Corrosion Control

Author : Atul Tiwari
Publisher : Butterworth-Heinemann
ISBN 13 : 0124115349
Total Pages : 747 pages
Book Rating : 4.1/5 (241 download)

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Book Synopsis Intelligent Coatings for Corrosion Control by : Atul Tiwari

Download or read book Intelligent Coatings for Corrosion Control written by Atul Tiwari and published by Butterworth-Heinemann. This book was released on 2014-10-25 with total page 747 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intelligent Coatings for Corrosion Control covers the most current and comprehensive information on the emerging field of intelligent coatings. The book begins with a fundamental discussion of corrosion and corrosion protection through coatings, setting the stage for deeper discussion of the various types of smart coatings currently in use and in development, outlining their methods of synthesis and characterization, and their applications in a variety of corrosion settings. Further chapters provide insight into the ongoing research, current trends, and technical challenges in this rapidly progressing field. Reviews fundamentals of corrosion and coatings for corrosion control before delving into a discussion of intelligent coatings—useful for researchers and grad students new to the subject Covers the most current developments in intelligent coatings for corrosion control as presented by top researchers in the field Includes many examples of current and potential applications of smart coatings to a variety of corrosion problems

Microencapsulation Technology for Corrosion Mitigation by Smart Coatings

Author : Jerry Buhrow
Publisher : BiblioGov
ISBN 13 : 9781289053086
Total Pages : 26 pages
Book Rating : 4.0/5 (53 download)

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Book Synopsis Microencapsulation Technology for Corrosion Mitigation by Smart Coatings by : Jerry Buhrow

Download or read book Microencapsulation Technology for Corrosion Mitigation by Smart Coatings written by Jerry Buhrow and published by BiblioGov. This book was released on 2013-06 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multifunctional, smart coating for the autonomous control of corrosion is being developed based on micro-encapsulation technology. Corrosion indicators as well as corrosion inhibitors have been incorporated into microcapsules, blended into several paint systems, and tested for corrosion detection and protection effectiveness. This paper summarizes the development, optimization, and testing of microcapsules specifically designed to be incorporated into a smart coating that will deliver corrosion inhibitors to mitigate corrosion autonomously. Key words: smart coating, corrosion inhibition, microencapsulation, microcapsule, pH sensitive microcapsule, corrosion inhibitor, corrosion protection pain.

Smart Protective Coatings for Corrosion Control

Author : Lingwei Ma
Publisher : John Wiley & Sons
ISBN 13 : 3527847138
Total Pages : 533 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis Smart Protective Coatings for Corrosion Control by : Lingwei Ma

Download or read book Smart Protective Coatings for Corrosion Control written by Lingwei Ma and published by John Wiley & Sons. This book was released on 2024-03-27 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart Protective Coatings for Corrosion Control Overview of the latest research in advanced coatings for anticorrosion and the development of optimized surfaces with high anticorrosion ability Smart Protective Coatings for Corrosion Control introduces the newest research developments in self-healing coatings, self-reporting coatings, and superhydrophobic coatings, reviewing corrosion processes and strategies, smart coatings for corrosion protection, techniques for synthesizing and applying smart coatings, different kinds of self-healing and self-reporting coatings activated by different environmental stimuli, and current and future trends of protective coatings for automotive, aerospace, marine, nuclear, oil/gas, and military applications. This book also discusses new ideas in the field, such as the combination of self-healing and self-reporting properties, new techniques to study localized microscale electrochemical corrosion behavior, as well as atmospheric corrosion monitor technique to study the real-time protection behavior of coatings in different environments. The processes of coating degradation and metal corrosion are discussed in detail so that non-experts can gain a basic understanding of the corrosion protection techniques. Written by two highly qualified academics with significant research experience in the field, Smart Protective Coatings for Corrosion Control includes information on: Coating preparation, filler preparation, surface characterization, macroscopic and microscopic electrochemical properties, and self-healing performance of self-healing coating systems under different environmental stimuli Photothermal conversion species such as graphene oxide, titanium nitride, and Fe3O4 Different types of corrosion indicators, such as phenolphthalein, sulfosalicylic acid-modified carbon dots, and phenanthroline High-mobility polymer networks that endow a shape memory effect and allow coatings to recover their original shape and barrier properties Solutions to three corrosion conditions—room temperature immersion, alternating wet-dry, and outdoor atmospheric exposure conditions Presenting the latest research in the field, Smart Protective Coatings for Corrosion Control is a practical and highly valuable reference on the subject for scientists, researchers, and students in diverse programs of study.

Corrosion Mitigation

Author : Ashish Kumar
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110760649
Total Pages : 287 pages
Book Rating : 4.1/5 (17 download)

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Book Synopsis Corrosion Mitigation by : Ashish Kumar

Download or read book Corrosion Mitigation written by Ashish Kumar and published by Walter de Gruyter GmbH & Co KG. This book was released on 2022-07-18 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion Science and Engineering is now an integral part of research throughout the world. Researchers are actively looking for an alternative eco-friendly way of developing non-toxic corrosion inhibitors from natural sources. This book discusses all the recent advancements in the corrosion field with an emphasis on natural sources which is the demand of the era to replace the commercially available toxic corrosion inhibitors.

Smart Anticorrosive Materials

Author : Chandrabhan Verma
Publisher : Elsevier
ISBN 13 : 0323951597
Total Pages : 649 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Smart Anticorrosive Materials by : Chandrabhan Verma

Download or read book Smart Anticorrosive Materials written by Chandrabhan Verma and published by Elsevier. This book was released on 2023-03-28 with total page 649 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart Anticorrosive Materials: Trends and Opportunities covers new developments in nanoscale coatings and their current applications. The book addresses fundamental characteristics, synthesis, inhibition mechanisms and applications of green nanomaterials for educational (academic) as well as industrial purposes and provides a chronological overview of the growth of the field. The book concludes with discussions about commercialization, economics and environmental considerations. This will be an indispensable reference for scholars, chemical engineers, chemists and materials scientists working in R&D and academia who want to understand corrosion systems and modern advancements on smart coatings. Presents current research and the latest developments in corrosion protection and future opportunities, along with anticorrosive effects of nanomaterials and nanocomposites Focuses on advanced nanomaterials and nanocomposites coatings for industry-oriented practices, including current challenges during manufacturing Includes websites of interest and information the about latest research

Corrosion Protection at the Nanoscale

Author : Susai Rajendran
Publisher : Elsevier
ISBN 13 : 0128193603
Total Pages : 540 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Corrosion Protection at the Nanoscale by : Susai Rajendran

Download or read book Corrosion Protection at the Nanoscale written by Susai Rajendran and published by Elsevier. This book was released on 2020-03-10 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion Protection at the Nanoscale explores fundamental concepts on how metals can be protected at the nanoscale by using both nanomaterials-based solutions, including nanoalloys, noninhibitors and nanocoatings. It is an important reference resource for both materials scientists and engineers wanting to find ways to create an efficient corrosion prevention strategy. Nanostructure materials have been widely used in many products, such as print electronics, contact, interconnection, implant, nanosensors and display units to lessen the impact of corrosion. Traditional methods for protection of metals include various techniques, such as coatings, inhibitors, electrochemical methods (anodic and cathodic protections), metallurgical design are covered in this book. Nanomaterials-based protective methods can offer many advantages over their traditional counterparts, such as protection for early-stage, higher corrosion resistance, better corrosion control. This book also outlines these advantages and discusses the challenges of implementing nanomaterials as corrosion protection agents on a wide scale. - Explains the main methods of detection, monitoring, testing, measurement and simulation of corrosion at the nanoscale - Explores how metals can be protected at the nanoscale using nanotechnology and nanomaterials - Discusses the major challenges of detecting and preventing corrosion at the nanoscale

Development of a Smart Coating Based on Hollow Nanoparticles for Corrosion Detection and Protection

Author : Pierre Loison
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (116 download)

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Book Synopsis Development of a Smart Coating Based on Hollow Nanoparticles for Corrosion Detection and Protection by : Pierre Loison

Download or read book Development of a Smart Coating Based on Hollow Nanoparticles for Corrosion Detection and Protection written by Pierre Loison and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In various domains, but especially in the space industry, protection of metallic structures against corrosion is a foremost objective because of maintenance and fixing costs in harsh environments. In order to preserve their integrity, a promising and original solution consists in detecting and slowing down corrosion as soon as it appears by developing a corrosion-sensitive and reactive coating. Recently, numerous studies have searched for the development of functional surfaces able to locally react to corrosion-related stimuli, belonging to the category of smart coatings. This PhD project, granted by ArianeGroup, is focused on this objective and deals with the development of nanocapsules containing corrosion inhibitors. These nanocapsules, formed through a miniemulsion process, are incorporated within an organic coating, applied on top of either steel of aluminum alloy substrates. The formed nanocapsules are then able to release their payload using a pH increase as a trigger. A pH change is indeed expected during cathodic activity, appearing at the early stages of the substrate degradation. This work describes the synthesis and characterization of nanocapsules, as well as their incorporation within an organic waterborne matrix. Both hydrophilic and hydrophobic-core capsules have been investigated before focusing on oil-core silica nanocapsules with diameter ca. 180 nm. In the first part, the release of a model inhibitor, namely 2-mercaptobenzothiazole (MBT) has been investigated and the inhibiting properties demonstrated. Then, the impact of capsules addition on coating integrity and properties has been studied using mainly electrochemical impedance spectroscopy. Potential enhancements of the proposed system are discussed. This system could be adapted and used for early detection of corrosion, using a corrosion sensor instead of the encapsulated inhibitor.

Theory and Applications of Green Corrosion Inhibitors

Author : Inamuddin
Publisher : Materials Research Forum LLC
ISBN 13 : 1644901048
Total Pages : 288 pages
Book Rating : 4.6/5 (449 download)

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Book Synopsis Theory and Applications of Green Corrosion Inhibitors by : Inamuddin

Download or read book Theory and Applications of Green Corrosion Inhibitors written by Inamuddin and published by Materials Research Forum LLC. This book was released on 2021-01-05 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents theoretical insights, characterization tools and mechanisms of green corrosion inhibitors and their industrial applications in areas such as reinforced concrete, coating, aircraft, oil and gas, acid pickling, water industry and the protection of metals and alloys used in electronic devices. Keywords: Biocorrosion Prevention, Green Corrosion Inhibitors, Corrosion Prevention of Metals & Alloys, Corrosion Inhibitors for Concrete, Corrosion Prevention for Electronic Devices, Biological Wastes, Biodegradable Plants, Smart Coatings, Quantum Chemistry, Molecular Dynamics, Simulation, Quantitative Structure Activity Relationship (QSAR), Pyrazine Corrosion Inhibitors.

Tailored Thin Coatings for Corrosion Inhibition Using a Molecular Approach

Author : Simo Olavi Pehkonen
Publisher : Academic Press
ISBN 13 : 0128135859
Total Pages : 416 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Tailored Thin Coatings for Corrosion Inhibition Using a Molecular Approach by : Simo Olavi Pehkonen

Download or read book Tailored Thin Coatings for Corrosion Inhibition Using a Molecular Approach written by Simo Olavi Pehkonen and published by Academic Press. This book was released on 2018-08-25 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tailored Thin Coatings for Corrosion Inhibition Using a Molecular Approach discusses the fundamentals and applications of various thin coatings for the inhibition of fouling and corrosion from a molecular perspective. It provides the reader with a fundamental understanding of why certain coatings perform better than others in a given environment. Surface analytical and electrochemical techniques in understanding the coating performance are emphasized throughout the book, providing readers with a useful reference on how to pursue a systematic corrosion inhibitor R&D program that involves the testing of coating performance using various, currently available, state-of-the-art laboratory techniques. Wherever relevant, environmental considerations of the discussed coatings’ technologies are highlighted and discussed, with current and upcoming regulatory trends put forth by different governmental organizations. Provides atomic and molecular level understanding of tailored thin coatings for corrosion inhibition Discusses key steps in corrosion, including the attachment of harmful substances to surfaces, the fouling of surfaces, and the initiation and propagation of corrosion on surfaces Written by leading experts in the field

Sustainable Corrosion Inhibitors

Author : Inamuddin
Publisher : Materials Research Forum LLC
ISBN 13 : 164490148X
Total Pages : 232 pages
Book Rating : 4.6/5 (449 download)

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Book Synopsis Sustainable Corrosion Inhibitors by : Inamuddin

Download or read book Sustainable Corrosion Inhibitors written by Inamuddin and published by Materials Research Forum LLC. This book was released on 2021-08-05 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the current status of corrosion inhibitor technology. A special focus is placed on various types of green corrosion inhibitors and their applications. Keywords: Green Corrosion Inhibitors, Sustainable Corrosion Inhibitors, Green Organic Inhibitors, Inhibitors from Biomass and Natural Sources, Polysaccharide, Applications for Concrete, Coatings, Copper and Copper Alloys, Corrosion Control in Conventional and Monolithic Metals.

Dual PH-sensitive Smart Coatings for Corrosion Protection of AA2024-T3

Author : Chao Li (Ph. D. in materials science)
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)

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Book Synopsis Dual PH-sensitive Smart Coatings for Corrosion Protection of AA2024-T3 by : Chao Li (Ph. D. in materials science)

Download or read book Dual PH-sensitive Smart Coatings for Corrosion Protection of AA2024-T3 written by Chao Li (Ph. D. in materials science) and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: To protect aluminum alloys including AA2024-T3 from corrosion, dual-pH sensitive smart coatings have been developed based on the encapsulation of inhibitor-loaded micro/nano-carriers. Previously reported pH-responsive coatings could only respond to either a pH increase or decrease during the corrosion process but not to both. To address this issue, a polyelectrolyte coacervate made from polyethylenimine and polyacrylic acid was developed. The obtained polyelectrolyte coacervate was found to degrade in the presence of either acidic or alkaline pH conditions. For the proof of concept, SrCrO4 as a model inhibitor was enclosed within the polyelectrolyte coacervate, and its release profile at different pH conditions was monitored by UV-vis spectroscopy. The entrapped SrCrO4 was released from the polyelectrolyte coacervate at a faster rate at both pH 2.5 and 10 compared to pH 7, and the released SrCrO4 inhibits the corrosion of AA2024-T3. Therefore, the developed polyelectrolyte coacervate is dual-pH sensitive and can be used to create a dual-pH responsive release system for corrosion protection of AA2024-T3. Dual-pH sensitive microspheres containing the corrosion inhibitor Ce(NO3)3 were fabricated with the polyelectrolyte coacervate as the shell material. Traditional preparation methods such as the layer-by-layer technique are time-consuming and require additional templates during the preparation process, so a simple and template-free coaxial electrospray method was developed to create Ce(NO3)3-loaded microspheres. The as-fabricated Ce(NO3)3-loaded microspheres have a core-shell structure and can release inhibitors when pH shifts to both acidic and alkaline regions. After introducing such microspheres into a polyvinyl butyral coating, the resulting coating system can improve the corrosion resistance of AA2024-T3. A microsphere-based smart coating might have limited corrosion inhibition applications due to the discrete distribution of microspheres within the coating and a negative impact on the integrity of the coating matrix. Thus, to address this issue, nanofibers containing a corrosion inhibitor were also developed. The nanofibers were prepared by the coaxial electrospinning technique with the chitosan/polyacrylic acid polyelectrolyte coacervate and Ce(NO3)3 as shell and core materials, respectively. The rendered nanofibers are also dual-pH sensitive and capable of releasing Ce(NO3)3 at both low and high pH conditions. A smart coating with embedded nanofibers can provide corrosion protection to AA2024-T3, and the nanofibers do not have a detrimental effect on the barrier property of the coating matrix. Furthermore, the nanofibers can facilitate the migration of Ce(NO3)3, leading to a continuous release of corrosion inhibitors at the same damaged site for repeated self-healing performance.

Self-Healing Smart Materials

Author : Inamuddin
Publisher : John Wiley & Sons
ISBN 13 : 1119710235
Total Pages : 560 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Self-Healing Smart Materials by : Inamuddin

Download or read book Self-Healing Smart Materials written by Inamuddin and published by John Wiley & Sons. This book was released on 2021-04-26 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book describes the design, synthesis, mechanisms, characterization, fundamental properties, functions and development of self-healing smart materials and their composites with their allied applications. It covers cementitious concrete composites, bleeding composites, elastomers, tires, membranes, and composites in energy storage, coatings, shape-memory, aerospace and robotic applications. The 21 chapters are written by researchers from a variety of disciplines and backgrounds.

Smart Coatings

Author : Theodore Provder
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Smart Coatings by : Theodore Provder

Download or read book Smart Coatings written by Theodore Provder and published by . This book was released on 2007 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past 25 years coatings technologies have been influenced by the need to lower volatile organic contents (VOC) in order to comply with stricter environmental regulations as well as to reduce the use of costly petroleum based solvents. During this time the use of waterborne coatings in the architectural, industrial maintenance and original equipment manufacturing (OEM) sectors has continued to grow replacing solvent based coatings while meeting the ever decreasing VOC targets. In addition to waterborne coatings, other alternative technologies in the industrial and OEM sectors include powder coatings, uv-curable coatings and high solids coatings have had significant growth. Traditionally these coatings had the primary functions of protecting and decorating substrates. More recently, there has been growth in Research and Development and commercial product generation of coatings which have novel functions and sense and interact with their environment in addition to having the traditional protection and decoration functions. These coatings are often referred to as Smart Coatings. These types of coatings generally provide significant added value. Smart Coatings can be achieved in many ways such as by addition of additives and strategically designing polymer structures and coatings morphologies.

Development of an Environmentally Benign Anticorrosion Coating for Aluminum Alloy Using Green Pigments and Organofunctional Silanes

Download Development of an Environmentally Benign Anticorrosion Coating for Aluminum Alloy Using Green Pigments and Organofunctional Silanes PDF Online Free

Author : Zhangzhang Yin
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (5 download)

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Book Synopsis Development of an Environmentally Benign Anticorrosion Coating for Aluminum Alloy Using Green Pigments and Organofunctional Silanes by : Zhangzhang Yin

Download or read book Development of an Environmentally Benign Anticorrosion Coating for Aluminum Alloy Using Green Pigments and Organofunctional Silanes written by Zhangzhang Yin and published by . This book was released on 2009 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerospace aluminum alloys such as Al alloy 2024-T3 and 7075-T6 are subject to localized corrosion due the existence of intermetallics containing Cu, Mg or Zn. Current protection measurement employs substantial use of chromate and high VOC organics, both of which are identified as environment and health hazards. The approach of this study is to utilize a combination of organofunctional silanes and a compatible inhibitor integrated into high-performance waterborne resins. First, an extensive pigment screening has been done to find replacements for chromates using the testing methodology for fast corrosion inhibition evaluation and pigment. Zinc phosphate and calcium zinc phosphomolybdate were found to have the best overall performance on Al alloys. Some new corrosion inhibitors were synthesized by chemical methods or modified by plasma polymerization for use in the coatings. Low-VOC, chromate-free primers (superprimer) were developed using these pigments with silane and acrylic-epoxy resins. The developed superprimer demonstrated good corrosion inhibition on aluminum substrates. The functions of inhibitor and silane in the coating were investigated. Both silane and inhibitor are critical for the performance of the superprimer. Silane was found to improve the adhesion of the coating to the substrate and also facilitate corrosion prevention. Addition of zinc phosphate to the coating improved the resistance of a scratched area against corrosion. The microstructure of the acrylic-epoxy superprimer coating was studied. SEM/EDAX revealed that the superprimer has a self-assembled stratified double-layer structure which accounts for the strong anti-corrosion performance of the zinc phosphate pigment. Zinc phosphate leaches out from the coating to actively protect the scratched area. The leaching of pigment was confirmed in the ICP-MS analysis and the leaching rate was measured. Coating-metal interface and the scribe of coated panels subjected to corrosion test was studied. ToF-SIMS studies confirmed the presence of silane at the interface and the hydrolysis of the silane. The abundant presence of silane was believed to improve the adhesion and also facilitate the corrosion prevention. The protection mechanism of the acrylic-epoxy superprimer was proposed. The self-assembled double-layer structure of the acrylic-epoxy superprimer consist of a less-penetrable hydrophobic layer (epoxy-dominated) on the top and a hydrophilic layer (acrylic-dominated) accommodating the inhibitors underneath. This unique structure of the acrylic-epoxy accounts for the good protection of the coating. Furthermore, the inhibition mechanism of zinc phosphate was explored and compared to those which have been reported. Based on the protection mechanism of the superprimer, electrodeposition was explored in order to achieve a more organized coating with a better engineered metal/coating interface. The electrodeposited coatings were found to have higher barrier property and anticorrosion performance.