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Measurements And Mechanisms Of Localized Aqueous Corrosion In Aluminum Lithium Alloys
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722362485 Total Pages :44 pages Book Rating :4.3/5 (624 download)
Book Synopsis Measurements and Mechanisms of Localized Aqueous Corrosion in Aluminum-Lithium Alloys by : National Aeronautics and Space Administration (NASA)
Download or read book Measurements and Mechanisms of Localized Aqueous Corrosion in Aluminum-Lithium Alloys written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-07 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like most heat treatable aluminum alloys, localized corrosion and stress corrosion of Al-Li-Cu alloys is strongly dependent on the nature and distribution of second phase particles. To develop a mechanistic understanding of the role of localized corrosion in the stress corrosion process, bulk samples of T(sub 1) (Al2CuLi) and a range of Al-Cu-Fe impurity phases were prepared for electrochemical experiments. Potentiodynamic polarization and galvanic couple experiments were performed in standard 0.6 M NaCl and in simulated crevice solutions to assess corrosion behavior of these particles with respect to the alpha-Al matrix. A comparison of time to failure versus applied potential using a constant load, smooth bar SCC test technique in Cl(-), Cl(-)/CrO4(2-), and Cl(-)/CO3(2-) environments shows that rapid failures are to be expected when applied potentials are more positive than the breakaway potential (E sub br) of T(sub 1) (crack tip) but less than E(sub br) of alpha-Al (crack walls). It is shown that this criterion is not satisfied in aerated Cl(-) solutions. Accordingly, SCC resistance is good. This criterion is satisfied, however, in an alkaline isolated fissure exposed to a CO2 containing atmosphere. Rapid failure induced by these fissures was recently termed preexposure embrittlement. Anodic polarization shows that the corrosion behavior of T(sub 1) is relatively unaffected in alkaline CO3(2-) environments but the alpha-Al phase is rapidly passivated. X ray diffraction of crevice walls from artificial crevices suggests that passivation of alpha-Al occurs as hydrotalcite-type compound (LiAl2(OH)6)2(+) - CO3(2-) - nH2O. Buchheit, Rudolph G., Jr. and Stoner, Glenn E. Unspecified Center ...
Book Synopsis Mechanisms of Localized Aqueous Corrosion in Aluminum-lithium-copper Alloys by : Rudolph G. Buchheit
Download or read book Mechanisms of Localized Aqueous Corrosion in Aluminum-lithium-copper Alloys written by Rudolph G. Buchheit and published by . This book was released on 1991 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this dissertation is to determine the role of microstructural heterogeneity, the localized environment chemistry and unusual surface films in localized corrosion and stress corrosion cracking of an Al-3Cu-2Li alloy commercially designated as 2090.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723569500 Total Pages :258 pages Book Rating :4.5/5 (695 download)
Book Synopsis Environment Assisted Degradation Mechanisms in Aluminum-Lithium Alloys by : National Aeronautics and Space Administration (NASA)
Download or read book Environment Assisted Degradation Mechanisms in Aluminum-Lithium Alloys written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Section 1 of this report records the progress achieved on NASA-LaRC Grant NAG-1-745 (Environment Assisted Degradation Mechanisms in Al-Li Alloys), and is based on research conducted during the period April 1 to November 30, 1987. A discussion of work proposed for the project's second year is included. Section 2 provides an overview of the need for research on the mechanisms of environmental-mechanical degradation of advanced aerospace alloys based on aluminum and lithium. This research is to provide NASA with the basis necessary to permit metallurgical optimization of alloy performance and engineering design with respect to damage tolerance, long term durability and reliability. Section 3 reports on damage localization mechanisms in aqueous chloride corrosion fatigue of aluminum-lithium alloys. Section 4 reports on progress made on measurements and mechanisms of localized aqueous corrosion in aluminum-lithium alloys. Section 5 provides a detailed technical proposal for research on environmental degradation of Al-Li alloys, and the effect of hydrogen in this. Gangloff, Richard P. and Stoner, Glenn E. and Swanson, Robert E. Unspecified Center NASA-CR-182482, NAS 1.26:182482, UVA/528266/MS88/101 NAG1-745...
Book Synopsis Study of Localized Corrosion in Aluminum Alloys by the Scanning Reference Electrode Technique by : Merlin D. Danford
Download or read book Study of Localized Corrosion in Aluminum Alloys by the Scanning Reference Electrode Technique written by Merlin D. Danford and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aqueous Corrosion of Aluminum-Lithium Alloys by :
Download or read book Aqueous Corrosion of Aluminum-Lithium Alloys written by and published by . This book was released on 1952 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Studies of Localized Corrosion in Welded Aluminum Alloys by the Scanning Reference Electrode Technique by : Merlin D. Danford
Download or read book Studies of Localized Corrosion in Welded Aluminum Alloys by the Scanning Reference Electrode Technique written by Merlin D. Danford and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Localized Corrosion of Aluminum-lithium Alloy by : Shouliang Shao
Download or read book Localized Corrosion of Aluminum-lithium Alloy written by Shouliang Shao and published by . This book was released on 1988 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environment assisted degradation mechanisms in aluminum-lithium alloys by : R. P. Gangloff
Download or read book Environment assisted degradation mechanisms in aluminum-lithium alloys written by R. P. Gangloff and published by . This book was released on 1988 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environment assisted degradation mechanisms in advanced light metals by : R. P. Gangloff
Download or read book Environment assisted degradation mechanisms in advanced light metals written by R. P. Gangloff and published by . This book was released on 1989 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Observations on the Mechanisms and Kinetics of Aqueous Aluminum Corrosion by : R. L. Dillon
Download or read book Observations on the Mechanisms and Kinetics of Aqueous Aluminum Corrosion written by R. L. Dillon and published by . This book was released on 1957 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stress-corrosion Behavior of Aluminum-lithium Alloys in Aqueous Environments by :
Download or read book Stress-corrosion Behavior of Aluminum-lithium Alloys in Aqueous Environments written by and published by . This book was released on 1983 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Localized Corrosion--cause of Metal Failure by :
Download or read book Localized Corrosion--cause of Metal Failure written by and published by ASTM International. This book was released on 1972 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Corrosion of Aluminium by : Christian Vargel
Download or read book Corrosion of Aluminium written by Christian Vargel and published by Elsevier. This book was released on 2004-10-02 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of Aluminium highlights the practical and general aspects of the corrosion of aluminium alloys with many illustrations and references. In addition to that, the first chapter allows the reader who is not very familiar with aluminium to understand the metallurgical, chemical and physical features of the aluminium alloys. The author Christian Vargel, has adopted a practitioner approach, based on the expertise and experience gained from a 40 year career in aluminium corrosion This approach is most suitable for assessing the corrosion resistance of aluminium- an assessment which is one of the main conditions for the development of many uses of aluminium in transport, construction, power transmission etc. 600 bibliographic references provide a comprehensive guide to over 100 years of related study Providing practical applications to the reader across many industries Accessible to both the beginner and the expert
Book Synopsis Corrosion Studies of 2195 Al-Li Alloy and 2219 Al Alloy with Differing Surface Treatments by : M. D. Danford
Download or read book Corrosion Studies of 2195 Al-Li Alloy and 2219 Al Alloy with Differing Surface Treatments written by M. D. Danford and published by . This book was released on 1998 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1992 with total page 1720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exfoliation Corrosion Susceptibility and Mechanisms of Al-Li 2060 T8E30 Aluminum Lithium Alloy in Acidic Media by : Ahmad Ivan Karayan
Download or read book Exfoliation Corrosion Susceptibility and Mechanisms of Al-Li 2060 T8E30 Aluminum Lithium Alloy in Acidic Media written by Ahmad Ivan Karayan and published by . This book was released on 2015 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Al-Li 2060 aluminum lithium alloy was first launched in 2011. This alloy is a potential candidate for the use at wing/fuselage forgings, lower wing, and fuselage/pressure cabin. However, since its first launching, the corrosion properties of this alloy has not been extensively explored. There are three common laboratory tests for assessing the exfoliation corrosion (EFC) susceptibility of aluminum alloy 2XXX, namely EFC test in EXCO, modified EXCO and MASTMAASIS media. The objectives of this work is to study the susceptibility and mecahnism of corrosion of this alloy in EXCO, modified EXCO and MATSMAASIS media. These three media are acid. In the EXCO solution, this alloy suffers EFC after a 96-hour EFC test. The pH dramatically increases in the first 11 hours from 0.25 to 0.30. The pH then slightly increases and tends to remain constant at pH of 3.45 after 96 hours. The cyclic potentiodynamic polarization (CPP) test results show the presence of negative hysteresis and one breakdwon potential. This negative hysteresis suggests the absence of pitting corrosion due to the breakdown of passive film. The potentiostatic tests at potentials below and above the breakdown potential show an abrupt increase in potential in the first minutes and the presence of current transients. The scanning electron microscopy (SEM)-energy dispersive x-ray spectroscopy (EDS) examination confirms that the Al20Cu2Mn3 particles preferentially dissolve, leaving the pitting after a potentiostatic test below the breakdown potential. From the potentiostatic test at a potential above the breakdown potential and an SEM examination after this potentiostatic test, intergranular corrosion (IGC) was observed. The electrochemical impedance spectroscopy (EIS) test and mathematical modeling indicates that the adsorption of intermediates in reduction of hydrogen ions is dominant in the first hours of immersion. The two time constants are observed when EFC occurs. The video capture microscopy obviously reveals the contribution of corrosion product and hydrogen gas bubbles to the grain lifting during EFC. An XRD analysis on this corrosion product confirms that this is composed of aluminum hydroxide and hydrated aluminum oxide. Unlike the EXCO solution, the modified EXCO one has a higher initial pH. In the first fifteen hours, the pH increases from 3.43 at hour 1 to 3.47 at hour 15. The pH value then increases very slowly and tends to remain constant at 3.49 after 96 hours. The CPP curve has two breakdown potentials where the first one correspond to pitting corrosion and the second one is attributed to IGC. The positive hysteresis indicates this alloy experiences the localized breakdown of passive film that generates pitting corrosion. No indication of EFC was observed after a 96-hour EFC test in the modified EXCO solution. The Nyquist and phase angle plots only show one single time constant during the EFC test for 96 hours. Cyclic acidified salt fog MASTMAASIS testing is an accelerated test method that closely mimic the outdoor exposure. Therefore, the results of MASTMAASIS test predict the EFC susceptibility of aluminum alloy in the real applications more accurately. Our results show that this alloy suffers pitting corrosion only after a four-week MASTMAASIS test in the fog chamber.
