ASTM B840-1999(2004) Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits《锌钴合金沉积物用电解镀层标准规范》.pdf
《ASTM B840-1999(2004) Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits《锌钴合金沉积物用电解镀层标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM B840-1999(2004) Standard Specification for Electrodeposited Coatings for Zinc Cobalt Alloy Deposits《锌钴合金沉积物用电解镀层标准规范》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 840 99 (Reapproved 2004)Standard Specification forElectrodeposited Coatings of Zinc Cobalt Alloy Deposits1This standard is issued under the fixed designation B 840; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the requirements for electrode-posited zinc cobalt alloy coatings on metals.1.2 Th
3、e following precautionary caveat pertains to the testmethod portion only, Section 8, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and he
4、althpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusB 183 Practice for Preparation of Low-Carbon Steel forElectroplatingB 242 Guide for Preparation of High-Carbon Steel
5、ForElectroplatingB 320 Practice for Preparation of Iron Castings for Electro-platingB 322 Guide for Cleaning Metals Prior to ElectroplatingB 374 Terminology Relating to ElectroplatingB 487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination of aCross SectionB
6、 499 Test Method for Measurement of Coating Thick-nesses By the Magnetic Method: Nonmagnetic Coatingson Magnetic Basis MetalsB 504 Test Method for Measurement of Thickness of Me-tallic Coatings by the Coulometric MethodB 507 Practice for Design ofArticles to Be Electroplated onRacksB 568 Test Method
7、 for Measurement of Coating Thicknessby X-Ray SpectrometryB 571 Practice for Qualitative Adhesion Testing of MetallicCoatingsB 602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB 697 Guide for Selection of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic
8、CoatingsB 762 Test Method of Variables Sampling of Metallic andInorganic CoatingsB 849 Specification for Pre-Treatments of Iron or Steel forReducing Risk of Hydrogen EmbrittlementB 850 Guide for Post-Coating Treatments of Steel for Re-ducing the Risk of Hydrogen EmbrittlementD 3951 Practice for Comm
9、ercial Packaging3. Terminology3.1 DefinitionsMany terms used in this specification aredefined in Terminology B 374.3.2 Definitions of Terms Specific to This Standard:3.2.1 significant surface, nthat portion of a coated arti-cles surface where the coating is required to meet all therequirements of th
10、e coating specification for that article.Significant surfaces are usually those that are essential to theserviceability or function of the article or can be a source ofcorrosion products or tarnish films that interfere with thefunction or desirable appearance of the article. Significantsurfaces are
11、those surfaces that are identified by the purchaserby, for example, indicating them on an engineering drawing ofthe product or marking a sample item of the product.4. Classification4.1 There is one coating class, and it is defined as Class1deposits having 99 mass % zinc, the balance being cobalt.4.2
12、 There are five coating types and they are defined asfollows:4.2.1 Type aWith colorless (blue bright) chromate con-version coatings.4.2.2 Type bWith yellow chromate conversion coating.4.2.3 Type cWith bronze chromate conversion coating.4.2.4 Type dWith black chromate conversion coating.4.2.5 Type eA
13、ny of the above types plus organic topcoat.1This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.08.04 on Soft Metals.Current edition approved Aug. 1, 2004. Published August 2004. Originallyapproved i
14、n 1993. Last previous edition approved in 1999 as B 840 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1C
15、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1Whereas colored chromate conversion coatings are usuallymeant to include various shades of yellow to bronze when used withnon-alloyed zinc, yellow and bronze chromate conversion coa
16、tings areconsidered distinctly different when applied to alloyed zinc coatings andare formulated specifically to produce the desired coating.4.3 There are three grades according to thickness and aredefined as follows:Minimum Thickness, m New ASTM Grade Old ASTM Grade66112 12 218 18 35. Ordering Info
17、rmation5.1 In order to make the application of this specificationcomplete, the purchaser needs to supply the following infor-mation to the seller in the purchase order and drawings.5.1.1 Title, ASTM designation number, and date of issue ofthis specification.5.1.2 Deposit by classification including
18、class, type, andgrade (see 4.1, 4.2, 4.3).5.1.3 Composition and metallurgical condition of the sub-strate to be coated.5.1.4 Location of significant surfaces (3.2.1).5.1.5 Heat treatment for stress relief, whether it has beenperformed by purchaser or is required (6.7).5.1.6 Heat treatment after elec
19、troplating, if required (6.8).5.1.7 Whether or not location of rack marks is to be defined(6.3.1).5.1.8 Any requirement for special test specimens (8.1.1).5.1.9 Acceptance inspection procedure to be used (Section7).5.1.10 Any requirement for certification (Section 10).5.1.11 Any other items needing
20、agreement. For the purposesof this specification, prior agreement on the nature of the finishis required as items plated in bulk may differ in appearancefrom those that are rack plated.6. Coating Requirements6.1 SubstrateThe metal to be plated shall be free of flawsand defects that will be detriment
21、al to the zinc alloy coating. Itshall be subjected to such cleaning, pickling, and electroplatingprocedures as are necessary to yield deposits with the desiredquality.NOTE 2Proper preparatory procedures and thorough cleaning areessential to ensure satisfactory adhesion and corrosion resistance perfo
22、r-mance of the coating. Materials used for cleaning should not damage thebasis metal, for example, by causing defects such as pits, intergranularattack, or stress corrosion cracking. It is recommended that the followingASTM practices for cleaning, where appropriate, be used: PracticesB 183, B 320, a
23、nd B 322 and Guide B 242.6.1.1 The electroplating shall be applied after all basis metalheat treatments have been completed.6.2 Nature of Coating:6.2.1 The coating shall consist of a zinc cobalt alloy that isapproximately 99 mass % zinc and the balance cobalt.6.2.2 The coating shall be produced from
24、 an aqueouselectroplating system, either alkaline or acid, and may bespecified at the discretion of the purchaser.6.2.3 The coating shall have such supplementary conversioncoatings as defined in 4.2 and specified in the purchase order.6.3 Appearance:6.3.1 The coating on all readily visible surfaces
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
最后一页预览完了!喜欢就下载吧,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMB84019992004STANDARDSPECIFICATIONFORELECTRODEPOSITEDCOATINGSFORZINCCOBALTALLOYDEPOSITS 合金 沉积物 用电

链接地址:http://www.mydoc123.com/p-462450.html