ASTM B841-1999(2004) Standard Specification for Electrodeposited Coatings for Zinc Nickel Alloy Deposits《锌镍合金沉积物用电解镀层标准规范》.pdf
《ASTM B841-1999(2004) Standard Specification for Electrodeposited Coatings for Zinc Nickel Alloy Deposits《锌镍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 B841-1999(2004) Standard Specification for Electrodeposited Coatings for Zinc Nickel Alloy Deposits《锌镍合金沉积物用电解镀层标准规范》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 841 99 (Reapproved 2004)Standard Specification forElectrodeposited Coatings of Zinc Nickel Alloy Deposits1This standard is issued under the fixed designation B 841; 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 nickel alloy coatings on metals.1.2 Th
3、e values stated in SI units are to be regarded as thestandard.1.3 The following precautionary statement pertains to thetest method 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 responsibi
4、lity of the userof this standard to establish appropriate safety and healthpractices 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 S
5、teel forElectroplatingB 242 Guide for Preparation of High-Carbon Steel 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
6、 OxideCoating Thickness by Microscopical Examination of aCross SectionB 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 Prac
7、tice for Design of Articles To Be Electroplatedon RacksB 568 Test Method 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
8、Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic 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
9、for Re-ducing the Risk of Hydrogen EmbrittlementB 3951 Practice for Commercial Packaging3. Terminology3.1 DefinitionsMany items 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
10、 surface where the coating is required to meet all therequirements of the coating specification for that article.Significant surfaces are usually those that are essential to theserviceability or function of the article, or that can be a sourceof corrosion products or tarnish films that interfere wit
11、h thefunction or desirable appearance of the article.3.2.2 DiscussionSignificant surfaces are those surfacesthat are identified by the purchaser by, for example, indicatingthem on an engineering drawing of the product or marking asample item of the product.4. Classification4.1 There is one class of
12、zinc nickel coating defined asfollows:4.1.1 Class 1Deposits having a minimum of 5 and maxi-mum 12 mass % nickel, the balance being zinc.4.2 There are five chromate conversion coating types thatare defined as follows:4.2.1 Type AWith colorless (blue bright) conversion coat-ings,4.2.2 Type BWith yello
13、w iridescent conversion coatings,4.2.3 Type CWith bronze conversion coatings,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
14、 August 2004. Originallyapproved in 1993. Last previous edition approved in 1999 as B 841 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
15、Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2.4 Type DWith black chromate conversion coatings,and4.2.5 Type EAny of the above plus organic topcoat.NOTE 1Whereas colored chromate conversion coatin
16、gs are usuallymeant to include various shades of yellow to bronze when used withnonalloyed zinc, yellow and bronze chromate conversion coatings areconsidered distinctly different in appearance and performance whenapplied to alloyed zinc coatings and are formulated specifically to producethe desired
17、coating and are formulated specifically to produce the desiredcoating.4.3 There are three grades according to thickness and aredefined as follows:Minimum Thickness, m New ASTM Grade Old ASTM Grade55188210 10 35. Ordering Information5.1 In order to make the application of this specificationcomplete,
18、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 standard specification,5.1.2 Deposit by classification including Class, Type, andGrade (see 4.1, 4.2, 4.3),5.1.3 Composition and me
19、tallurgical condition of the sub-strate to be coated,5.1.4 Location of significant surfaces (see 3.2.1),5.1.5 Heat treatment for stress relief, whether it has beenperformed by purchaser or is required (see 6.7),5.1.6 Heat treatment after electroplating, if required (see6.8),5.1.7 Whether or not loca
20、tion of rack marks is to be defined(see 6.3.1),5.1.8 Any requirement for special test specimens (see8.1.1),5.1.9 Acceptance inspection procedure to be used (seeSection 8), and5.1.10 Any requirement for certification (see Section 10).5.1.11 Any other items needing agreement. For the purposesof this s
21、pecification, 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 detrimental to the zinc alloy coating. Itshal
22、l 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 perfor-mance of the coating. Materials us
23、ed 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 followingpractices for cleaning, where appropriate, be used: Practices B 183 andB 320, and Guides B 242 and B 322.6.1.1 The elec
24、troplating 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 nickel alloy that hasa minimum of 5 and maximum 12 mass percent nickel, thebalance being zinc.6.2.2 The coating shall be produced from an aqueouselectr
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