ASTM B866-1995(2003) 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(2003) 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(2003) 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 2003)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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers equipment and methods fordetecting gross defects and mechanic
3、al 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
5、related 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 pur
6、port 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:B 2
7、46 Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes4B 374 Terminology Relating to Electroplating5B 488 Specification for Electrodeposited Coatings of Goldfor Engineering Uses5B 542 Terminology Relating to Electrical Contacts andTheir Use6B 545 Specificati
8、on for Electrodeposited Coatings of Tin5B 605 Specification for Electrodeposited Coatings of Tin-Nickel Alloy5B 679 Specification for Electrodeposited Coatings of Palla-dium for Engineering Use5B 689 Specification for Electrodeposited EngineeringNickel Coatings5B 733 Specification for Autocatalytic
9、(Electroless) Nickel-Phosphorus Coatings on Metal5B 735 Test Method for Porosity in Gold Coatings on MetalSubstrates by Nitric Acid Vapor6B 741 Test Method for Porosity in Gold Coatings on MetalSubstrates by Paper Electrography6B 765 Guide for Selection of Porosity Tests for Electrode-posits and Rel
10、ated Metallic Coatings5B 798 Test Method for Porosity in Gold or PalladiumCoatings on Metal Substrates by Gel-Bulk Electrography6B 799 Test Method for Porosity in Gold and PalladiumCoatings by Sulfurous Acid/Sulfur Dioxide Vapor6B 809 Test Method for Porosity in Metallic Coatings byHumid Sulfur Vapo
11、r (“Flowers-of-Sulfur”)53. 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 polysulfider
12、eagent 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-
13、plated large pores (with diameters an order of magnitudegreater than intrinsic porosity) and networks of microcracks.NOTE 1Such large pores and microcrack networks indicate seriousdeviations from acceptable coating practice (as, for example, dirty1This test method is under the jurisdiction of ASTM C
14、ommittee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.Current edition approved Feb. 10, 2003. Published May 2003. Originallyapproved in 1995. Last previous edition approved in 1995 as B 866 95.2Clarke, M., “Porosity and Porosity Tests,”
15、 in Properties of Electrodeposits,edited by Sard, Leidheiser, and 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. 47.4Annual Book of ASTM Standard
16、s, Vol 02.03.5Annual Book of ASTM Standards, Vol 02.05.6Annual Book of ASTM Standards, Vol 02.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.basis-metal substrates and contaminated or out-of-balance plating baths).3.2.3 intrinsic
17、 porositythe “normal” porosity that ispresent, to some degree, in all commercial thin platings (suchas in precious-metal coatings for engineering purposes) andwill generally follow an inverse relationship with thickness.NOTE 2Intrinsic porosity is due primarily to small deviations fromideal plating
18、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 micrometres, so that only small areas ofunderlying metal are exposed to the environment.3.2.4 measurement areathe portion or portions
19、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 the provision ofsuitably marked samples.3.2.5 metallic coatingsplatings, claddings, or other metal-lic coatings applied to the
20、 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, crack, or other defect that exposes the underlying metal tothe environment.3.2.7 underplatea metallic coating layer between thebas
21、is 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-throughthe exposure of underplate or basismetal as a direct result of wear. Wear-through is an observablephenomenon.3.2.9 wear
22、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 Test Method4.1 The test samples are immersed in an alkaline polysulfidesolution at 74C (165F) for 60 s. After rinsing and dry
23、ing, 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 Use5.1 The purpose of the alkaline polysulfide immersion test isto determine the presence of mechanical damage, wear-through, a
24、nd 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.5.2 The protection afforded by well applied coatings may bediminished by improper handling following plating or as aresult of w
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