_STP_785-1982.pdf

GUIDE TO THE SELECTION AND USE OF ELECTROPLATED AND RELATED FINISHES A manual sponsored by ASTM Committee B-8 on Metallic and Inorganic Coatings ASTM SPECIAL TECHNICAL PUBLICATION 785 F.A.Lowenheim ASTM Publication Code Number(PCN)04-785000-04 9 1916 Race Street,Philadelphia,Pa.19103 Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Copyright by AMERICAN SOCIETY FOR TESTING AND MATERIALS 1982 Library of Congress Catalog Card Number:82-70617 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Ann Arbor,Mich.July 1982 Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Foreword F.A.Lowenheim had nearly completed the final revision of Guide to the Selection and Use of Electroplated and Related Finishes at the time of his death in August 1980.Final review was undertaken by his colleagues,and the manuscript was prepared for the printer by the ASTM Editorial Staff.This manual is sponsored by ASTM Committee B-8 on Metallic and Inorganic Coatings.Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Related ASTM Publications Annual Book of ASTM Standards,Part 9,Metallic and Inorganic Coatings;Metal Powders;Sintered P/M Structural Parts,01-009082-05 Unified Numbering System for Metals and Alloys and Cross Index of Chem-ically Similar Specifications,DS 56A(1977),05-056001-01 MetallographyA Practical Tool for Correlating the Structure and Properties of Materials,STP 557(1974),04-557000-28 Ferroalloys and Other Additives to Liquid Iron and Steel,STP 739(1981),04-739000-01 Industrial Applications of Titanium and Zirconium,STP 728(1981),04-728000-05 Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.A Note of Appreciation to Reviewers This publication is made possible by the authors and,also,the unheralded efforts of the reviewers.This body of technical experts whose dedication,sac-rifice of time and effort,and collective wisdom in reviewing the papers must be acknowledged.The quality level of ASTM publications is a direct function of their respected opinions.On behalf of ASTM we acknowledge with ap-preciation their contribution.ASTM Committee on Publications Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Editorial Staff Jane B.Wheeler,Managing Editor Helen M.Hoersch,Senior Associate Editor Helen P.Mahy,Senior Assistant Editor Allan S.Kleinberg,Assistant Editor Virginia M.Barishek,Assistant Editor Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.Contents Chapter 1Scope and Purpose 1 Chapter 2Purposes of Electroplating 4 Chiter 3Metallic Finishes Available for Electroplating 6 Chapter 4Advantages and Disadvantages of Electroplated 8 Chapter 5Methods of Application 10 Chapter 6Design for Electroplating 15 Chter 7Factors to be Considered in Choosing an Electroplated Coatuig 17 Chter 8Criteria of Choice 18 Chtqiter 9Nature of the Basis Metal(Substrate)28 Chapter 10Related Finishes 32 Chapter 11Properties of Coating Metals 37 Chapter 12Tests for Compliance 56 Conclusion 62 Copyright by ASTM Intl(all rights reserved);Sat Jan 2 21:10:56 EST 2016Downloaded/printed byUniversity of Washington(University of Washington)pursuant to License Agreement.No further reproductions authorized.STP785-EB/JUI.1982 Chapter 1Scope and Purpose This guide aims to aid the designer,engineer,and others responsible for specifying finishes in the selection of appropriate electroplated and related coatings.It is not a manual of electroplating practice for the metal finisher,who will know how to apply the specified coating,but rather a guide to the available coatings and their methods of application.The following definitions from ASTM Definitions of Terms Relating to Electroplating(B 374),slightly modified for editorial purposes,outline the scope of this guide.Electroplating is the electrodeposition of an adherent metallic coating upon an electrode for the purpose of securing a surface with properties or dimensions different from those of the basis metal.Electrodeposition,in turn,is the process of depositing a substance upon an electrode by electroly-sis,which is