Characterization of Electrodeposited Zn-Ni Alloy Coatings as a Replacement for Electrodeposited Zn and Cd Coatings PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Characterization of Electrodeposited Zn-Ni Alloy Coatings as a Replacement for Electrodeposited Zn and Cd Coatings PDF full book. Access full book title Characterization of Electrodeposited Zn-Ni Alloy Coatings as a Replacement for Electrodeposited Zn and Cd Coatings by Sriraman Kankoduthavanitham Rajagopalan. Download full books in PDF and EPUB format.
Author: Sriraman Kankoduthavanitham Rajagopalan Publisher: ISBN: Category : Languages : en Pages :
Book Description
"Sacrificial metallic coatings, such as those based on Zn and Cd are used to protect steel components against corrosion. Growing environmental and health concerns have limited the use of Cd in any form since Cd plating bath is cyanide based and Cd compounds are carcinogenic. This thesis investigates Zn-Ni as a potential replacement for Cd and Cd based alloy coatings used in aerospace industries and Zn in automotive industries with respect to their tribological, corrosion and tribocorrosion resistance and hydrogen embrittlement susceptibility. In situ tribometry and additional ex situ analyses revealed that Zn-Ni coatings had superior resistance to adhesive wear compared to cadmium coatings. The microhardness of Zn-Ni coatings was higher than Zn and Cd coatings. Hardness on the wear track of Zn-Ni coatings showed the formation of strain hardened tribo layer. Zn-Ni coatings had higher polarization resistance after wear testing as compared to zinc and cadmium coatings. The mass loss due to wear enhanced corrosion was less with Zn-Ni than with Zn and Cd coatings. Zn-Ni coatings are a suitable replacement to Cd coatings when the surfaces are subjected to simultaneous wear and corrosion. Zn-Ni coatings had higher polarization resistance after the 24 hour immersion tests compared to zinc and cadmium coatings. Zn-Ni coatings offer better sacrificial corrosion protection because of low corrosion rates, and are a suitable replacement for Cd coatings. The Passivated Zn-Ni coatings showed lower corrosion resistance when heat treated due to localized damage of passive films while there was no effect of heat treatment on corrosion resistance of as plated Zn-Ni coatings. During the electrodeposition of metals, hydrogen is evolved due to electrolysis. The evolved hydrogen may diffuse outward and become trapped in the substrate/coating interface or migrate inward into the steel lattice causing delayed embrittlement when the component is subjected to stress. This study reports two principal variables for Zn, Zn-Ni, and Cd coatings: (i) quantity of hydrogen absorbed by the coating and substrate, by vacuum thermal desorption (ii) permeability of the coating material to hydrogen, by electrochemical permeation. The findings were analyzed in correlation with microstructural characteristics of both the coating material and the coating/substrate interface. With Zn-Ni, both coating process and coating material combined to significantly reduce the risk of internal hydrogen embrittlement by: (i) introducing the least amount hydrogen during the electrodeposition process, and (ii) by the ease with which hydrogen can be extracted by baking due to the presence of cracks in the coating.Keywords: Zn-Ni, Cd, Cd-Ti, Zn, EIS, insitu tribology, tribocorrosion, hydrogen permeation, TDS" --
Author: Sriraman Kankoduthavanitham Rajagopalan Publisher: ISBN: Category : Languages : en Pages :
Book Description
"Sacrificial metallic coatings, such as those based on Zn and Cd are used to protect steel components against corrosion. Growing environmental and health concerns have limited the use of Cd in any form since Cd plating bath is cyanide based and Cd compounds are carcinogenic. This thesis investigates Zn-Ni as a potential replacement for Cd and Cd based alloy coatings used in aerospace industries and Zn in automotive industries with respect to their tribological, corrosion and tribocorrosion resistance and hydrogen embrittlement susceptibility. In situ tribometry and additional ex situ analyses revealed that Zn-Ni coatings had superior resistance to adhesive wear compared to cadmium coatings. The microhardness of Zn-Ni coatings was higher than Zn and Cd coatings. Hardness on the wear track of Zn-Ni coatings showed the formation of strain hardened tribo layer. Zn-Ni coatings had higher polarization resistance after wear testing as compared to zinc and cadmium coatings. The mass loss due to wear enhanced corrosion was less with Zn-Ni than with Zn and Cd coatings. Zn-Ni coatings are a suitable replacement to Cd coatings when the surfaces are subjected to simultaneous wear and corrosion. Zn-Ni coatings had higher polarization resistance after the 24 hour immersion tests compared to zinc and cadmium coatings. Zn-Ni coatings offer better sacrificial corrosion protection because of low corrosion rates, and are a suitable replacement for Cd coatings. The Passivated Zn-Ni coatings showed lower corrosion resistance when heat treated due to localized damage of passive films while there was no effect of heat treatment on corrosion resistance of as plated Zn-Ni coatings. During the electrodeposition of metals, hydrogen is evolved due to electrolysis. The evolved hydrogen may diffuse outward and become trapped in the substrate/coating interface or migrate inward into the steel lattice causing delayed embrittlement when the component is subjected to stress. This study reports two principal variables for Zn, Zn-Ni, and Cd coatings: (i) quantity of hydrogen absorbed by the coating and substrate, by vacuum thermal desorption (ii) permeability of the coating material to hydrogen, by electrochemical permeation. The findings were analyzed in correlation with microstructural characteristics of both the coating material and the coating/substrate interface. With Zn-Ni, both coating process and coating material combined to significantly reduce the risk of internal hydrogen embrittlement by: (i) introducing the least amount hydrogen during the electrodeposition process, and (ii) by the ease with which hydrogen can be extracted by baking due to the presence of cracks in the coating.Keywords: Zn-Ni, Cd, Cd-Ti, Zn, EIS, insitu tribology, tribocorrosion, hydrogen permeation, TDS" --
Author: Abner Brenner Publisher: Elsevier ISBN: 1483223116 Category : Technology & Engineering Languages : en Pages : 735
Book Description
Electrodeposition of Alloys: Principles and Practice, Volume I covers the general and theoretical aspects of the electrodeposition of alloy containing silver and/or copper. This book is organized into three parts encompassing 21 chapters. The first part considers first the history of electrodeposition, the applications of electrodeposited alloys, and the practical considerations involved in electrodeposition. This part also deals with the effect of operating variables on composition of electrodeposited alloys, and the physico-chemical properties of the alloy. The second part focuses on the theoretical aspects of alloy electrodeposition. This part includes discussions on the role of cathode diffusion layer, the effects of complexing agents, and the concept of alloy plating. The third part discusses the practical aspects of the electrodeposition of alloys, focusing primarily on the electrodeposition of alloys from aqueous solutions. This part examines first brass and bronze plating, followed by the electrodeposition of copper-tin, silver, and iron containing alloys. This book is directed toward electrochemists and researchers.
Author: Nasser Kanani Publisher: Elsevier ISBN: 0080505392 Category : Technology & Engineering Languages : en Pages : 367
Book Description
Electroplating: Basic Principles, Processes and Practice offers an understanding of the theoretical background to electroplating, which is essential if the practical results are to be as required. This book is different in that it explains HOW the electrodeposition processes work, covering such topics as the elctrodeposition of composites, multilayers, whisker formation and giant magnetoresistive effects. The section on R & D approaches will be especially useful for organisations in the field. This is the first English language version of a well-known German language book from a prestigious author of international repute.'Electroplating' is an invaluable resource for manufacturers of coatings, electrochemists, metal finishers and their customers and academics in surface engineering.·Offers an understanding of the theoretical background to electroplating·Explains how the electrodeposition processes work·Prestigious author of international repute
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781792693229 Category : Science Languages : en Pages : 32
Book Description
Corrosion evaluation studies were conducted on 4130 alloy steel samples coated with electrodeposited zinc-nickel and samples coated with electrodeposited cadmium. The zinc nickel was deposited by the selection electrochemical metallizing process. These coated samples were exposed to a 5-percent salt fog environment at 35 plus or minus 2 C for a period ranging from 96 to 240 hours. An evaluation of the effect of dichromate coatings on the performance of each plating was conducted. The protection afforded by platings with a dichromate seal was compared to platings without the seal. During the later stages of testing, deposit adhesion and the potential for hydrogen entrapment were also evaluated. Mcmillan, V. C. Marshall Space Flight Center NASA-TM-103551, NAS 1.15:103551 ...
Author: Arnold Marder Publisher: Elsevier ISBN: 0323984894 Category : Technology & Engineering Languages : en Pages : 610
Book Description
The Metallurgy of Zinc Coated Steels provides a comprehensive overview of the science and engineering of zinc coatings. Beginning with a look at new innovations made in the hot-dip coating methods (CGL), the book goes on to discuss phase equilibria, Zn bath phenomena and overlay coating formations. Both processing methods and controls are covered, as well as corrosion resistance and coating product properties. The book concludes with a discussion of future opportunities for zinc coatings. This book is a vital resource for both individuals new to this area while also serving as a handbook for users and producers of zinc coatings. - Presents a basic understanding of the science and engineering behind zinc coatings with a thorough and cutting-edge look at their processing methods, controls, properties, and applications - Discusses corrosion resistance, overlay coating formation, heat treatment, interface reactions, deposition processes, and more - Covers real-world applications of these coatings
Author: Branko N. Popov Publisher: Elsevier ISBN: 0444627278 Category : Science Languages : en Pages : 813
Book Description
Corrosion Engineering: Principles and Solved Problems covers corrosion engineering through an extensive theoretical description of the principles of corrosion theory, passivity and corrosion prevention strategies and design of corrosion protection systems. The book is updated with results published in papers and reviews in the last twenty years. Solved corrosion case studies, corrosion analysis and solved corrosion problems in the book are presented to help the reader to understand the corrosion fundamental principles from thermodynamics and electrochemical kinetics, the mechanism that triggers the corrosion processes at the metal interface and how to control or inhibit the corrosion rates. The book covers the multidisciplinary nature of corrosion engineering through topics from electrochemistry, thermodynamics, mechanical, bioengineering and civil engineering. - Addresses the corrosion theory, passivity, material selections and designs - Covers extensively the corrosion engineering protection strategies - Contains over 500 solved problems, diagrams, case studies and end of chapter problems - Could be used as a text in advanced/graduate corrosion courses as well self-study reference for corrosion engineers
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
One possible substitute for cadmium in some applications is a zinc--nickel alloy deposit. Previous work by others showed that electrodeposited zinc--nickel coatings containing about 85 percent zinc and 15 percent nickel provided noticeably better corrosion resistance than pure zinc. Present work which supports this finding also shows that the corrosion resistance of the alloy deposit compares favorably with cadmium.
Author: U. Kamachi Mudali Publisher: Springer Nature ISBN: 9811675546 Category : Technology & Engineering Languages : en Pages : 241
Book Description
This book encompasses select proceedings of NSEST-2020 and ECSIRM-2020. The volume covers advances in major areas of electrochemical science and technology and surface engineering. It covers all aspects of electrochemistry with more emphasis on corrosion. The corrosion topics include self-healing sol-gel based corrosion resistant coatings, nitric acid corrosion of stainless steel, stress corrosion cracking, etc. Few chapters are focused on electrodeposition and new materials for oxygen evolution catalysts, fuel cells and batteries. The chapters on molecularly imprinted polymer sensor for dual analytes, electrochemical sensors for lead ions and dopamine, etc., are of interest. Some papers are related to the green synthesis of nanosized oxides and superhydrophobic coatings. This book will be handy and beneficial to researchers, students, and professionals working in areas related to electrochemistry and surface engineering.
Author: Sriraman Kankoduthavanitham Rajagopalan
Author: Sriraman Kankoduthavanitham Rajagopalan
Author: Abner Brenner
Author: Nasser Kanani
Author: National Aeronautics and Space Adm Nasa
Author: S. Krongelb
Author: Arnold Marder
Author: Branko N. Popov
Author: M. Matlosz
Author: 
Author: U. Kamachi Mudali