ASTM B809-1995(2008) Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor ( Flowers-of-Sulfur )《用湿硫黄蒸气( 硫黄华 )作金属涂层中孔隙率测试的标准试验方法》.pdf
《ASTM B809-1995(2008) Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor ( Flowers-of-Sulfur )《用湿硫黄蒸气( 硫黄华 )作金属涂层中孔隙率测试的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM B809-1995(2008) Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor ( Flowers-of-Sulfur )《用湿硫黄蒸气( 硫黄华 )作金属涂层中孔隙率测试的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 809 95 (Reapproved 2008)Standard Test Method forPorosity in Metallic Coatings by Humid Sulfur Vapor(“Flowers-of-Sulfur”)1This standard is issued under the fixed designation B 809; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f 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 standard covers equipment and test methods fordetermining the porosity of metallic coatin
3、gs, where the porespenetrate down to a silver, 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 a reduced sulfur atmosphere, such asgold, nickel, tin, tin-lead, and palladium, o
4、r their alloys.1.3 This test method is designed to determine whether theporosity level is less than or greater than some value which byexperience is considered by the user to be acceptable for theintended application.1.4 Recent reviews of porosity testing and testing methodscan be found in the liter
5、ature.2,3Guide B 765 is suitable toassist in the selection of porosity tests for electrodeposits andrelated metallic coatings. Other porosity test standards are TestMethods B 735, B 741, B 798, and B 799.1.5 The values stated in SI units are to be regarded as thestandard. The values given in parenth
6、eses are for informationonly.1.6 This standard does not purport 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
7、 prior to use. For specific hazardsstatements, see Section 8.2. Referenced Documents2.1 ASTM Standards:4B 374 Terminology Relating to ElectroplatingB 542 Terminology Relating to Electrical Contacts andTheir UseB 735 Test Method for Porosity in Gold Coatings on MetalSubstrates by Nitric Acid VaporB 7
8、41 Test Method for Porosity In Gold Coatings On MetalSubstrates By Paper Electrography5B 765 Guide for Selection of Porosity and Gross DefectTests for Electrodeposits and Related Metallic CoatingsB 798 Test Method for Porosity in Gold or PalladiumCoatings on Metal Substrates by Gel-Bulk Electrograph
9、yB 799 Test Method for Porosity in Gold and PalladiumCoatings by Sulfurous Acid/Sulfur-Dioxide Vapor3. Terminology3.1 DefinitionsMany terms used in this test method aredefined in Terminologies B 374 and B 542.3.2 Definitions of Terms Specific to This Standard:3.2.1 corrosion productsreaction product
10、s of the basismetal or underplate, that protrude from, or are otherwiseattached to, the coating surface after the test exposure.3.2.2 measurement areain this test method, that portion orportions of the surface that is examined for the presence ofporosity. The measurement area shall be indicated on t
11、hedrawings of the parts, or by the provision of suitably markedsamples.3.2.3 metallic coatingsin this test method, include plat-ings, claddings, or other metallic coatings applied to thesubstrate. The coating can comprise a single metallic layer ora combination of metallic layers.3.2.4 porositythe p
12、resence of any discontinuity, crack, orhole in the coating that exposes a different underlying metal(see Guide B 765).3.2.5 significant surface of a coated part, is that portion(or portions) of the coating surface that is essential to theserviceability or function of the part, or which can be thesou
13、rce of corrosion products or tarnish films that interfere withthe function of the part. For many plated products, the criticalsurface is identical to the measurement area.3.2.6 tarnishreaction products of copper or silver withoxygen or reduced sulfur (that is, hydrogen sulfide (H2S) andelemental sul
14、fur vapor, but not sulfur dioxide (SO2) or other1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.Current edition approved Aug. 1, 2008. Published September 2008. Originallyapprove
15、d in 1990. Last previous edition approved in 2003 as B 809 95 (2003).2Clarke, M., “Porosity and Porosity Tests,” Properties of Electrodeposits, Sard,Leidheiser, and Ogburn, eds., The Electrochemical Society, 1975, p. 122.3Krumbein, S. J., “Porosity Testing of Contact Platings,” Transactions of theCo
16、nnectors and Interconnection Technology Symposium, Philadelphia, PA, October1987, p. 47.4For 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 Summa
17、ry page onthe ASTM website.5Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.sulfur oxides). They consist of thin films or spots that do notprotrude significantly from the surface of the metallic coating(in contrast to corro
18、sion products).3.2.7 tarnish creepagemovement of tarnish films acrossthe surface of the coating, the tarnish having originated eitherfrom pores or cracks in the coating or from areas of bare silver,copper, or copper alloy near the measurement area (as in a cutedge).3.2.8 underplate(s)a metallic coat
19、ing layer(s) between thesubstrate and the topmost layer or layers. The thickness of anunderplate is usually greater than 1 m (40 in.).4. Summary of Test Method4.1 The test specimens are suspended over “flowers-of-sulfur” (powdered sulfur) in a vented container at controlledelevated relative humidity
20、 and temperature. Elemental sulfurvapor, which always exists in equilibrium with sulfur power ina closed system, attacks any exposed silver, copper, or copperalloy, such as at the bottom of pores. Brown or black tarnishspots indicate porosity.4.2 Exposure periods may vary, depending on the extent of
21、porosity to be revealed.4.3 This test involves tarnish or oxidation (corrosion) reac-tions in which the products delineate defect sites in coatings.Since the chemistry and properties of these products may notresemble those found in natural or service environments, thistest is not recommended for pre
22、diction of product performanceunless correlation is first established with service experience(but see 5.3).5. Significance and Use5.1 A major use of this test procedure is for determiningcoating quality. Porosity tests are indications of the complete-ness of protection or coverage offered by the coa
23、tings, since thecoatings described in 1.2 are intended to be protective whenproperly applied. The porosity test results are therefore ameasure of the deposition process control.5.2 Aparticular purpose of the humid sulfur vapor test is fordetermining the quality of underplates of nickel or nickel all
24、oyin those finish systems that have thin, 1.2 m or less (50 in. orless) top layers above the nickel, since porosity in the under-plate usually continues into such top layers.5.3 The humid sulfur vapor test is often used as an envi-ronmental test to simulate many indoor humid atmospheretarnishing and
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