ASTM B842-1999(2016) Standard Specification for Electrodeposited Coatings of Zinc Iron Alloy Deposits《锌铁合金镀层的电解沉积镀层的标准规格》.pdf
《ASTM B842-1999(2016) Standard Specification for Electrodeposited Coatings of Zinc Iron Alloy Deposits《锌铁合金镀层的电解沉积镀层的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM B842-1999(2016) Standard Specification for Electrodeposited Coatings of Zinc Iron Alloy Deposits《锌铁合金镀层的电解沉积镀层的标准规格》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B842 99 (Reapproved 2016)Standard Specification forElectrodeposited Coatings of Zinc Iron Alloy Deposits1This standard is issued under the fixed designation B842; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 specification covers the requirements for electrode-posited zinc iron alloy coatings on metals.1.2 The value
3、s stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 The 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,
4、 associated with its use. It is the responsibility 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) Apparatus
5、B183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Preparation of High-Carbon Steel for Elec-troplatingB320 Practice for Preparation of Iron Castings for Electro-platingB322 Guide for Cleaning Metals Prior to ElectroplatingB374 Terminology Relating to ElectroplatingB48
6、7 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB499 Test Method for Measurement of Coating Thicknessesby the Magnetic Method: Nonmagnetic Coatings onMagnetic Basis MetalsB504 Test Method for Measurement of Thickness of Metal-lic Coatings
7、 by the Coulometric MethodB568 Test Method for Measurement of Coating Thicknessby X-Ray SpectrometryB571 Practice for Qualitative Adhesion Testing of MetallicCoatingsB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB697 Guide for Selection of Sampling Plans for Inspectionof E
8、lectrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsB849 Specification for Pre-Treatments of Iron or Steel forReducing Risk of Hydrogen EmbrittlementB850 Guide for Post-Coating Treatments of Steel for Reduc-ing the Risk of Hydrogen E
9、mbrittlementD3951 Practice for Commercial Packaging3. Terminology3.1 DefinitionsMany terms used in this specification aredefined in Terminology B374.3.2 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
10、 to meet all therequirements of the coating specification for that article.3.2.1.1 DiscussionSignificant surfaces are usually thosethat are essential to the serviceability or function of the article,or that can be a source of corrosion products or tarnish filmsthat interfere with the function or des
11、irable appearance of thearticle. Significant surfaces are those surfaces that are identi-fied by the purchaser by, for example, indicating them on anengineering drawing of the product or marking a sample itemof the product.4. Classification4.1 There is one class of zinc iron alloy that is defined as
12、follows:4.1.1 Class 1Deposits having approximately 99 mass %zinc, balance iron.4.2 There are two coating types that are defined as follows:4.2.1 Type AZinc iron with black chromate conversioncoating, and4.2.2 Type BZinc iron with iridescent yellow chromateconversion coating.1This specification is un
13、der the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.06 on Soft Metals.Current edition approved Nov. 1, 2016. Published November 2016. Originallyapproved in 1993. Last previous edition approved in 2011 as B842 99 (2011).DOI:
14、 10.1520/B0842-99R16.2For 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.Copyright ASTM International, 100 Barr H
15、arbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.3 There are three coating grades according to thicknessthat are defined as follows:Minimum Thickness, m New ASTM Grade Old ASTM Grade66112 12 218 18 35. Ordering Information5.1 In order to make the application of this specif
16、icationcomplete, 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 class (see 4.1),type (see 4.2), and grade (see 4.3),5.1.3
17、Composition and metallurgical condition of the sub-strate to be coated,5.1.4 Location of significant surfaces (see 3.2),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 Any
18、 requirement for submission of sample coatedarticles,5.1.8 Whether or not location of rack marks is to be defined(see 6.3.1),5.1.9 Any requirement for special test specimens (see 8.1),5.1.10 Acceptance inspection procedure to be used (seeSection 8),5.1.11 Any requirement for certification (see Secti
19、on 10),and5.1.12 Any other items needing agreement. For the purposesof this specification, prior agreement on the nature of the finishis required as items plated in bulk may differ slightly inappearance from those that are rack plated.6. Coating Requirements6.1 SubstrateThe metal to be plated shall
20、be free of flawsand defects that will be detrimental to the zinc alloy coating. Itshall be subjected to such cleaning, pickling, and electroplatingprocedures as are necessary to yield deposits with the desiredquality.NOTE 1Proper preparatory procedures and thorough cleaning areessential to ensure sa
21、tisfactory adhesion and corrosion resistance perfor-mance of the coating. Materials used for cleaning should not damage thebasis metal. It is recommended that the following practices for cleaning beused, where appropriate: Practices B183 and B320, and Guides B242 andB322.6.1.1 The electroplating sha
22、ll be applied after all basis metalheat treatments have been completed.6.2 Nature of CoatingThe coating shall consist of a zinciron alloy that is approximately 99 mass % zinc and the balanceiron.6.3 Appearance:6.3.1 The coating on all readily visible surfaces shall havean acceptable and characterist
23、ic appearance as agreed upon bythe purchaser and seller. The coating shall be uniform insofaras the basis metal will permit. When the article is to be platedon a rack, contact marks may be unavoidable. Location of suchmark(s) shall be indicated on the article or its drawing.6.3.2 Defects and variati
24、ons in appearance that arise fromsurface conditions of the substrate (scratches, pores, roll marks,inclusions, and the like) and that persist in the coating despitethe observance of good metal finishing practices shall not because for rejection. The coating shall be adherent, free fromblisters, pits
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