ASTM_B_380_-_97_2013.pdf

Designation:B38097(Reapproved 2013)Standard Test Method forCorrosion Testing of Decorative Electrodeposited Coatingsby the Corrodkote Procedure1This standard is issued under the fixed designation B380;the number immediately following the designation indicates the year oforiginal adoption or,in the 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 the Corrodkote2method ofevaluating the corrosion performance of copper/nickel/chromium and nickel/chromium coatings electrodeposited onsteel,zinc alloys,aluminum alloys,plastics and other sub-strates.NOTE1The following ASTM standards are not requirements.Theyare reference for information only:Practice B537,Specification B456,Test Method B602,and Specification B604.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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 prior to use.2.Referenced Documents2.1 ASTM Standards:3B117 Practice for Operating Salt Spray(Fog)ApparatusB456 Specification for Electrodeposited Coatings of CopperPlus Nickel Plus Chromium and Nickel Plus ChromiumB537 Practice for Rating of Electroplated Panels Subjectedto Atmospheric ExposureB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB604 Specification for Decorative Electroplated Coatings ofCopper Plus Nickel Plus Chromium on PlasticsD1193 Specification for Reagent Water3.Summary of Test Method3.1 The test is conducted by applying a slurry containingcorrosive salts to test specimens,allowing the slurry to dry,andexposing the specimens coated with the slurry to a high relativehumidity for a specified period of time.4.Significance and Use4.1 Nickel/chromium and copper/nickel/chromium elec-trodeposited coatings are widely used for decorative andprotective applications.The Corrodkote test provides a methodof controlling the quality of electroplated articles and issuitable for manufacturing control,as well as research anddevelopment.5.Apparatus5.1 The apparatus shall consist of a humidity chamber,specimen supports,provision for heating the chamber,andprovisions for air circulation in the chamber.5.2 Drops of moisture that might accumulate on the ceilingor cover of the chamber of specimen supports shall not bepermitted to fall on the specimens being tested.NOTE2Suitable apparatus may be constructed from salt-spray equip-ment by eliminating fog-spray nozzles,substituting water for the saltsolution in the reservoir,adding a manifold for bubbling air through thewater in the reservoir,and adding a fan for circulating the air in thechamber with the fan discharge directed across the surface of the water inthe reservoir.5.3 Materials of construction shall not affect the corrosive-ness of the test.6.Procedure6.1 Corrodkote SlurryPrepare the Corrodkote slurry in aglass beaker by dissolving 0.035 g of reagent grade cupricnitrate(Cu(NO3)23H2O),0.165 g of ACS reagent grade ferricchloride(FeCl36H2O),and 1.0 g of ACS reagent gradeammonium chloride(NH4Cl)in 50 mL of water conforming toSpecification D1193,Type IV.Stir 30 g of water-washed,ceramic-grade kaolin into the solution.Mix the slurry thor-oughly and allow it to stand for about 2 min so that the kaolinwill become saturated.Mix the slurry thoroughly just beforeusing.1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.The original work in developing the Corrodkote procedure was initiated by theAmerican Electroplaters Society Research Committee,Project No.15.Current edition approved Dec.1,2013.Published December 2013.Originallyapproved in 1961.Last previous edition approved in 2008 as B380 97(2008)1.DOI:10.1520/B0380-97R13.2Bigge,D.M.,“Experience with the Use of the Corrodkote Test,”Proceedings,Am.Electroplaters Soc.,Vol.46,1959,p.149.3For 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 Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.1.1 An alternative method of preparing the Corrodkoteslurry is as follows.Weigh out 2.5 g of cupric nitrate(Cu(NO3)23H2O),and dissolve and dilute with distilled waterin a volumetric flask to exactly 500 mL.Weigh out 2.50 g offerric chloride(FeCl36H2O),and dissolve and dilute withdistilled water in a second volumetric flask to exactly 500 mL.(The ferric chloride solution shall be kept in a dark