ImageVerifierCode 换一换
格式:PDF , 页数:5 ,大小:104.92KB ,
资源ID:186542      下载积分:8 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。 如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【https://www.wnwk.com/docdown/186542.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: QQ登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ASTM_B_877_-_96_2013.pdf)为本站会员(益****师)主动上传,蜗牛文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知蜗牛文库(发送邮件至admin@wnwk.com或直接QQ联系客服),我们立即给予删除!

ASTM_B_877_-_96_2013.pdf

1、Designation:B87796(Reapproved 2013)Standard Test Method forGross Defects and Mechanical Damage in Metallic Coatingsby the Phosphomolybdic Acid(PMA)Method1This standard is issued under the fixed designation B877;the number immediately following the designation indicates the year oforiginal adoption o

2、r,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test standard covers equipment and methods forusing phosphomolybdic acid(PMA)to

3、detect gross defects andmechanical damage including wear through in metallic coat-ings of gold,silver,or palladium.These metals comprise thetopmost metallic layers over substrates of nickel,copper,orcopper alloys.1.2 Recent reviews of porosity testing,which include thosefor gross defects,and testing

4、 methods can be found in theliterature.2,3An ASTM guide to the selection of porosity andgross defect tests for electrodeposits and related metalliccoatings is available as Guide B765.Other related porosity andgross defects test standards are Test Methods B735,B741,B798,B799,B809,and B866,Specificati

5、ons B488,B679,andB689.1.3 The values stated in SI units are the preferred units.Those in parentheses are for information only.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro

6、-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:4B374 Terminology Relating to ElectroplatingB488 Specification for Electrodeposited Coatings of Goldfor Engineering UsesB542 Terminology Relating to El

7、ectrical Contacts and TheirUseB679 Specification for Electrodeposited Coatings of Palla-dium for Engineering UseB689 Specification for Electroplated Engineering NickelCoatingsB735 Test Method for Porosity in Gold Coatings on MetalSubstrates by Nitric Acid VaporB741 Test Method for Porosity In Gold C

8、oatings On MetalSubstrates By Paper Electrography(Withdrawn 2005)5B765 Guide for Selection of Porosity and Gross Defect Testsfor Electrodeposits and Related Metallic CoatingsB798 Test Method for Porosity in Gold or Palladium Coat-ings on Metal Substrates by Gel-Bulk ElectrographyB799 Test Method for

9、 Porosity in Gold and PalladiumCoatings by Sulfurous Acid/Sulfur-Dioxide VaporB809 Test Method for Porosity in Metallic Coatings byHumid Sulfur Vapor(“Flowers-of-Sulfur”)B866 Test Method for Gross Defects and Mechanical Dam-age in Metallic Coatings by Polysulfide Immersion3.Terminology3.1 Definition

10、sMany terms in this test method are definedin Terminology B374 or B5423.2 Definitions of Terms Specific to This Standard:3.2.1 base metal,nany metal other than gold,silver,platinum,palladium,iridium,or rhodium.Typical base metalsused as underplates or substrates are copper,nickel,tin,lead,and their

11、alloys.3.2.2 defect indications,ncolored droplets resulting fromthe reaction between the PMA reagent and the underlyingmetal.3.2.3 gross defects,nthose breaks in the coating thatexpose relatively large areas of underlying metal to theenvironment.Gross defects include those produced by me-chanical da

12、mage and wear,as well as as-plated large pores withdiameters an order of magnitude greater than intrinsic porosityand networks of microcracks.1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onT

13、est Methods.Current edition approved Dec.1,2013.Published December 2013.Originallyapproved in 1996.Last previous edition approved in 2008 as B877 96(2008).DOI:10.1520/B0877-96R13.2Clarke,M.,“Porosity and Porosity Tests,”Properties of Electrodeposits,ed.bySand,Leidheiser,and Ogburn,The Electrochemica

14、l Society,1975,p.122.3Krumbein,S.J.,“Porosity Testing of Contact Platings,”Trans.Connectors andInterconnection Technology Symposium,Philadelphia,PA,October 1987,p.47.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book

15、of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.5The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1L

16、arge pores and microcrack networks indicate serious devia-tions from acceptable coating practice(dirty substrates and contaminatedor out-of-balance plating baths).3.2.4 intrinsic porosity,nthe normal porosity that ispresent,to some degree,in all commercial thin electrodeposits(precious metal coatings for engineering purposes)that willgenerally follow an inverse relationship with thickness.NOTE2Intrinsic porosity is due to small deviations from ideal platingand surface preparation conditions.Scan

copyright@ 2008-2023 wnwk.com网站版权所有

经营许可证编号:浙ICP备2024059924号-2