Electrodeposition Dalliages Zinc Nickel Sur Acier Et Post Traitement Anti Corrosion Sans Chrome

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Electrodéposition d'alliages zinc-nickel sur acier et post-traitement anti-corrosion sans chrome

Author : Céline Salacruch
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (494 download)

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Book Synopsis Electrodéposition d'alliages zinc-nickel sur acier et post-traitement anti-corrosion sans chrome by : Céline Salacruch

Download or read book Electrodéposition d'alliages zinc-nickel sur acier et post-traitement anti-corrosion sans chrome written by Céline Salacruch and published by . This book was released on 2007 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ces travaux portent sur l'électrodéposition d'alliages zinc-nickel en milieu alcalin sur un substrat en acier en vue d'applications anti-corrosion dans le secteur aéronautique. L'étude des caractéristiques physico-chimiques des dépôts, élaborés à partir d'une formulation standard, montre la nécessité d'ajouter à celle-ci des additifs pour limiter l'évolution morphologique des dépôts en fonction de la densité de courant appliquée. Une étude électrochimique des premiers instants de croissance permet de définir les concentrations en cations métalliques et le mode de préparation optimums de l'électrolyte, permettant de déposer des revêtements épais de teneur en nickel comprise entre 13 et 14%mass, monophasés gamma et de microstructure uniforme sur une plage de densités de courant comprise entre 1 et 10 A.dm-2. Pour évaluer la fragilisation de l'acier occasionnée par l'hydrogène formé au cours de l'électrodéposition, des tests mécaniques de traction sont effectués. Ils mettent en évidence l'efficacité d'une interface dépôt/substrat riche en nickel contre la diffusion de l'hydrogène dans l'acier. Un post-traitement thermique de déshydrogénation est cependant indispensable pour limiter la fragilisation de l'acier. Pour accroître les propriétés anti-corrosion des dépôts ZnNi, une étude est menée sur l'élaboration par voie sol-gel d'un revêtement de finition sans chrome. Après l'étude de l'influence des paramètres opératoires sur les caractéristiques du film déposé, nous montrons que dans le cas d'un dépôt sur un acier à haute limite élastique, celui-ci confère au revêtement ZnNi une meilleure protection contre la corrosion qu'une couche de conversion à base de chrome hexavalent.

Electrodéposition d'alliages Zn-Ni par courant pulsé

Author : Sylvain Bruet-Hotellaz
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (489 download)

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Book Synopsis Electrodéposition d'alliages Zn-Ni par courant pulsé by : Sylvain Bruet-Hotellaz

Download or read book Electrodéposition d'alliages Zn-Ni par courant pulsé written by Sylvain Bruet-Hotellaz and published by . This book was released on 1996 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: DES ELECTRODEPOTS D'ALLIAGE ZINC-NICKEL SUR ACIER, UTILISES COMME REVETEMENT SACRIFICIEL, ONT ETE ELABORES PAR COURANT PULSE. L'UTILISATION DE SIGNAUX DE COURANT DISCONTINUS CONTRIBUE A UNE MODIFICATION DES CARACTERISTIQUES PHYSICOCHIMIQUES DES REVETEMENTS, DONT LA PLUS IMPORTANTE SEMBLE ETRE L'AUGMENTATION DE LA TENEUR EN NICKEL DES ALLIAGES. LA STRUCTURE DES ALLIAGES ELECTRODEPOSES EN COURANT CONTINU OU PULSE EST CONDITIONNEE PAR LEUR COMPOSITION CHIMIQUE. NOUS PROPOSONS UN DIAGRAMME DE PHASES DES DEPOTS ZINC-NICKEL ENTRE 0 ET 15% DE NICKEL, OU LA PHASE DELTA, OBSERVEE A L'EQUILIBRE THERMODYNAMIQUE, EST ABSENTE. EN COURANT CONTINU, LES DEPOTS SONT CONSTITUES DE LA PHASE ETA JUSQU'A 7,5% DE NICKEL, DES PHASES ETA ET GAMMA DE 7,5% ET 12,5% ET ENFIN DE LA PHASE GAMMA JUSQU'A 15%. EN COURANT PULSE, LE DOMAINE DE COEXISTENCE DES PHASES ETA ET GAMMA EST DEPLACE VERS LES PLUS HAUTES TENEURS EN NICKEL (14,5%). LA MORPHOLOGIE DE SURFACE DES DEPOTS OBTENUS EN COURANT CONTINU EVOLUE EN FONCTION DE LEUR STRUCTURE: LES GRAINS SONT EN FORME DE PLAQUETTES POUR UN DEPOT DE ZINC PUR PUIS DEVIENNENT PROGRESSIVEMENT HEXAGONAUX JUSQU'A 7,5% DE NICKEL. AU-DELA, ILS SONT DENDRITIQUES ET NE DEVIENNENT LISSES QU'A PARTIR DE 12,5% DE NICKEL. SOUS COURANT PULSE, UN EFFET NIVELANT ET UN AFFINEMENT DES GRAINS SIMILAIRES A CEUX D'UN ADDITIF ORGANIQUE SONT CONSTATES. L'ETUDE DU COMPORTEMENT EN CORROSION MARINE DES DEPOTS PAR DISSOLUTION INTENTIOSTATIQUE ET IMPEDANCE ELECTROCHIMIQUE A REVELE QUE LA NATURE DES PRODUITS ET LE TYPE DE CORROSION DIFFERENT SUIVANT LA STRUCTURE DES DEPOTS. LORSQUE L'ALLIAGE EST SOUS LA FORME DE LA PHASE ETA, IL Y A FORMATION DE PIQURES ET DE PRODUITS DE CORROSION CONSTITUES ESSENTIELLEMENT D'OXYDE ET D'HYDROXYDE DE ZINC. LORSQUE L'ALLIAGE EST SOUS LA FORME DE LA PHASE GAMMA, LA CORROSION SE DEVELOPPE SUIVANT DES LIGNES DE CONTRAINTES DU DEPOT AVEC FORMATION D'UN RESEAU DENSE DE FISSURES. LES PRODUITS DE CORROSION SONT DANS CE CAS MAJORITAIREMENT COMPOSES D'HYDROXYCHLORURE ET D'HYDROXYDE DE ZINC

Comprehensive Treatise of Electrochemistry

Author : Peter Horsman
Publisher : Springer Science & Business Media
ISBN 13 : 1461566908
Total Pages : 538 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Comprehensive Treatise of Electrochemistry by : Peter Horsman

Download or read book Comprehensive Treatise of Electrochemistry written by Peter Horsman and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is now time for a comprehensive treatise to look at the whole field of electrochemistry. The present treatise was conceived in 1974, and the earliest invitations to authors for contributions were made in 1975. The completion of the early volumes has been delayed by various factors. There has been no attempt to make each article emphasize the most recent situation at the expense of an overall statement of the modern view. This treatise is not a collection of articles from Recent Advances in Electro chemistry or Modern Aspects of Electrochemistry. It is an attempt at making a mature statement about the present position in the vast area of what is best looked at as a new interdisciplinary field. Texas A & M University John O'M. Bockris University of Ottawa Brian E. Conway Case Western Reserve University Ernest B. Yeager Texas A & M University Ralph E. White Preface to VoluIJJe 8 The past three decades have seen the rapid evolution of the transport aspects of electrochemical engineering into a formal part of electrochemistry as well as chemical engineering. With minor exceptions, however, this subject has not been systematically covered in any treatise or recent electrochemical text. The editors believe that the treatment in this volume will serve the function.

Flexoelectricity in Liquid Crystals

Author : Agnes Buka
Publisher : World Scientific
ISBN 13 : 1848167997
Total Pages : 299 pages
Book Rating : 4.8/5 (481 download)

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Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka

Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.

ZnO Thin Films

Author : Paolo Mele
Publisher :
ISBN 13 : 9781536160864
Total Pages : 0 pages
Book Rating : 4.1/5 (68 download)

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Book Synopsis ZnO Thin Films by : Paolo Mele

Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.

Guide for Aluminum Hull Welding

Author :
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Guide for Aluminum Hull Welding by :

Download or read book Guide for Aluminum Hull Welding written by and published by . This book was released on 2004 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nonlinear Optical Materials

Author : Jerome V. Moloney
Publisher : Springer Science & Business Media
ISBN 13 : 9780387985817
Total Pages : 270 pages
Book Rating : 4.9/5 (858 download)

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Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney

Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.

The Structural Use of Aluminium

Author : Council for Codes of Practice
Publisher :
ISBN 13 : 9780580055201
Total Pages : 186 pages
Book Rating : 4.0/5 (552 download)

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Book Synopsis The Structural Use of Aluminium by : Council for Codes of Practice

Download or read book The Structural Use of Aluminium written by Council for Codes of Practice and published by . This book was released on 1969-06-18 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminium, Aluminium alloys, Structural design, Design, Construction materials, Metal sections, Structural members, Structural systems, Loading, Acceptance (approval), Approval testing, Joints, Corrosion protection, Joining processes

Forms Supplement

Author :
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Forms Supplement by :

Download or read book Forms Supplement written by and published by . This book was released on 1984 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Specification for Tube of 99% Aluminium

Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580148460
Total Pages : 6 pages
Book Rating : 4.1/5 (484 download)

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Book Synopsis Specification for Tube of 99% Aluminium by : British Standards Institute Staff

Download or read book Specification for Tube of 99% Aluminium written by British Standards Institute Staff and published by . This book was released on 1986-02-28 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminium, Seamless pipes, Pipes, Cold-working, Drawing (forming process), Purity, Chemical composition, Thickness, Diameter, Tensile strength, Air transport engineering, Hydraulic tests, Test pressure, Non-destructive testing

Specification for Aluminium Collapsible Tubes

Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580139499
Total Pages : 22 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Specification for Aluminium Collapsible Tubes by : British Standards Institute Staff

Download or read book Specification for Aluminium Collapsible Tubes written by British Standards Institute Staff and published by . This book was released on 1984-09-01 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tubes (packages), Deformable packages, Packages, Packaging, Aluminium, Coatings, Dimensions, Closures, Caps (closures), Orifices, Length, Diameter, Thickness, Seals, Threads, Leak tests, Annealing, Mechanical testing, Crushing tests, Adhesion tests, Test equipment, Electrical testing, Circuits, Flexibility

AWS D10. 12M/D10. 12-2000, Guide for Welding Mild Steel Pipe

Author : American Welding Society
Publisher :
ISBN 13 : 9780871715517
Total Pages : pages
Book Rating : 4.7/5 (155 download)

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Book Synopsis AWS D10. 12M/D10. 12-2000, Guide for Welding Mild Steel Pipe by : American Welding Society

Download or read book AWS D10. 12M/D10. 12-2000, Guide for Welding Mild Steel Pipe written by American Welding Society and published by . This book was released on 2000-01-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Casting defects handbook : Aluminium and Aluminium alloys

Author : David V. Neff
Publisher :
ISBN 13 : 9780874333664
Total Pages : 161 pages
Book Rating : 4.3/5 (336 download)

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Book Synopsis Casting defects handbook : Aluminium and Aluminium alloys by : David V. Neff

Download or read book Casting defects handbook : Aluminium and Aluminium alloys written by David V. Neff and published by . This book was released on 2011 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: