ASTM B866-1995(2008) Standard Test Method for Gross Defects and Mechanical Damage in Metallic Coatings by Polysulfide Immersion《用聚硫化物浸入法测试金属涂层中总疵点和机械损坏的标准试验方法》.pdf
《ASTM B866-1995(2008) Standard Test Method for Gross Defects and Mechanical Damage in Metallic Coatings by Polysulfide Immersion《用聚硫化物浸入法测试金属涂层中总疵点和机械损坏的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM B866-1995(2008) Standard Test Method for Gross Defects and Mechanical Damage in Metallic Coatings by Polysulfide Immersion《用聚硫化物浸入法测试金属涂层中总疵点和机械损坏的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 866 95 (Reapproved 2008)Standard Test Method forGross Defects and Mechanical Damage in Metallic Coatingsby Polysulfide Immersion1This standard is issued under the fixed designation B 866; the number immediately following the designation indicates the year oforiginal adoption or, in th
2、e 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 method covers equipment and methods fordetecting gross defects and mechanica
3、l damage (includingwear-through) in metallic coatings where the breaks in thecoating penetrate down to a copper or copper alloy substrate.1.2 This test method is suitable for coatings consisting ofsingle or combined layers of any coating that does notsignificantly tarnish in an alkaline polysulfide
4、solution. Ex-amples are gold, nickel, tin, tin-lead, and palladium, or theiralloys.1.3 Recent reviews of porosity testing (which include thosefor gross defects) and testing methods can be found inliterature.2,3An ASTM guide to the selection of porosity andgross defect tests for electrodeposits and r
5、elated metalliccoatings is available as Guide B 765. Other related porosity teststandards are Test Methods B 735, B 741, B 798, B 799, andB 809.1.4 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.5 This standard does not purp
6、ort to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:4B 2
7、46 Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical PurposesB 374 Terminology Relating to ElectroplatingB 488 Specification for Electrodeposited Coatings of Goldfor Engineering UsesB 542 Terminology Relating to Electrical Contacts andTheir UseB 545 Specification f
8、or Electrodeposited Coatings of TinB 605 Specification for Electrodeposited Coatings of Tin-Nickel AlloyB 679 Specification for Electrodeposited Coatings of Palla-dium for Engineering UseB 689 Specification for Electroplated Engineering NickelCoatingsB 733 Specification for Autocatalytic (Electroles
9、s) Nickel-Phosphorus Coatings on MetalB 735 Test Method for Porosity in Gold Coatings on MetalSubstrates by Nitric Acid VaporB 741 Test Method for Porosity In Gold Coatings On MetalSubstrates By Paper Electrography5B 765 Guide for Selection of Porosity and Gross DefectTests for Electrodeposits and R
10、elated Metallic CoatingsB 798 Test Method for Porosity in Gold or PalladiumCoatings on Metal Substrates by Gel-Bulk ElectrographyB 799 Test Method for Porosity in Gold and PalladiumCoatings by Sulfurous Acid/Sulfur-Dioxide VaporB 809 Test Method for Porosity in Metallic Coatings byHumid Sulfur Vapor
11、 (“Flowers-of-Sulfur”)3. Terminology3.1 Definitions: Many terms used in this test method aredefined in Terminologies B 374 or B 542.3.2 Definitions of Terms Specific to This Standard:3.2.1 defect indicationsblack or dark colored productsresulting from the reaction between the alkaline polysulfiderea
12、gent and exposed copper or copper alloy underlying metal.3.2.2 gross defectsbreaks in the coating that expose rela-tively large areas of underlying metal to the environment(compare with intrinsic porosity (3.2.3). Gross defects includethose produced by mechanical damage and wear, in addition toas-pl
13、ated large pores (with diameters an order of magnitudegreater than intrinsic porosity) and networks of microcracks.NOTE 1Such large pores and microcrack networks indicate serious1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct respo
14、nsibility of Subcommittee B08.10 onTest Methods.Current edition approved Aug. 1, 2008. Published September 2008. Originallyapproved in 1995. Last previous edition approved in 2003 as B 866 03.2Clarke, M., “Porosity and Porosity Tests,” in Properties of Electrodeposits,edited by Sard, Leidheiser, and
15、 Ogburn, The Electrochemical 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
16、Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.5Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.deviations from acceptable co
17、ating practice (as, for example, dirtybasis-metal substrates and contaminated or out-of-balance plating baths).3.2.3 intrinsic porositythe “normal” porosity that ispresent, to some degree, in all commercial thin platings (suchas in precious-metal coatings for engineering purposes) andwill generally
18、follow an inverse relationship with thickness.NOTE 2Intrinsic porosity is due primarily to small deviations fromideal plating and surface preparation conditions. Scanning electron mi-croscope (SEM) studies have shown that the diameter of such pores, at theplating surface, is of the order of micromet
19、res, so that only small areas ofunderlying metal are exposed to the environment.3.2.4 measurement areathe portion or portions of thesurface examined for the presence of gross defects or mechani-cal damage (and wear-through). The measurement area shall beindicated on the drawings of the parts, or by
20、the provision ofsuitably marked samples.3.2.5 metallic coatingsplatings, claddings, or other metal-lic coatings applied to the basis-metal substrate. The coatingcan comprise a single metallic layer or a combination ofmetallic layers.3.2.6 porosity (general)in a coating, the presence of anyhole, crac
21、k, or other defect that exposes the underlying metal tothe environment.3.2.7 underplatea metallic coating layer between thebasis metal and the topmost metallic coating. The thickness ofan underplating is usually greater than 1 m, in contrast to astrike or flash, which is usually thinner.3.2.8 wear-t
22、hroughthe exposure of underplate or basismetal as a direct result of wear. Wear-through is an observablephenomenon.3.2.9 wear tracka mark that indicates the path alongwhich physical contact had been made during a sliding process(such as the mating and unmating of an electrical contact).4. Summary of
23、 Test Method4.1 The test samples are immersed in an alkaline polysulfidesolution at 74C (165F) for 60 s. After rinsing and drying, thesamples are examined for dark or discolored areas whichindicate exposure of copper or copper alloys to the solutionthrough breaks in the coating.5. Significance and U
24、se5.1 The purpose of the alkaline polysulfide immersion test isto determine the presence of mechanical damage, wear-through, and other gross defects in the coating. Most metalliccoatings are intended to be protective and the presence of grossdefects indicates a serious reduction of such protection.5
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