ASTM B380-1997(2018) Standard Test Method for Corrosion Testing of Decorative Electrodeposited Coatings by the Corrodkote Procedure.pdf

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1、Designation: B380 97 (Reapproved 2018)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

2、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

3、 of copper/nickel/chromium and nickel/chromium coatings electrodeposited onsteel, zinc alloys, aluminum alloys, plastics and other sub-strates.NOTE 1The following ASTM standards are not requirements. Theyare reference for information only: Practice B537, Specification B456,Test Method B602, and Spec

4、ification 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

5、 establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princ

6、iples for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3B117 Practice for Operating Salt Spray (Fog) ApparatusB456 Specification for Electrodeposited

7、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

8、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 p

9、eriod 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

10、, 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

11、supports shall not bepermitted to fall on the specimens being tested.NOTE 2Suitable 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

12、, 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 di

13、ssolving 0.035 g of reagent grade cupricnitrate (Cu(NO3)23H2O), 0.165 g of ACS reagent grade ferric1This 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

14、 the Corrodkote procedure was initiated by theAmerican Electroplaters Society Research Committee, Project No. 15.Current edition approved Aug. 1, 2018. Published August 2018. Originallyapproved in 1961. Last previous edition approved in 2008 as B380 97(2013). DOI:10.1520/B0380-97R18.2Bigge, D. M., “

15、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 stan

16、dards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Dec

17、ision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1chloride (FeCl36H2O), and 1.0 g of ACS reagent gradeammonium chloride (NH4Cl) in 50 mL of water conforming toSpecification

18、 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.6.1.1 An alternative method of preparing the Corrodkoteslurry is as

19、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 chlori

20、de solution shall be kept in a dark place andstoppered with a rubber or glass stopper when not in use.) (Theferric chloride solution shall not be more than 2 weeks old,since older solutions become unstable.) Weigh out 50.0 g ofammonium chloride (NH4Cl) and dissolve and dilute withdistilled water in

21、a volumetric flask to exactly 500 mL. Thenmeasure out exactly 7.0 mL of the cupric nitrate solution, 33.0mL of ferric chloride solution, and 10.0 mL of the ammoniumchloride solution; place these in a beaker to which 30.0 g ofkaolin is now added. Stir with a glass stirring rod.6.2 Test SpecimensThe t

22、ype and number of test specimensto be used, as well as the criteria for evaluation of the testresults, shall be defined in the specifications covering thematerial or product being tested, or shall be mutually agreedupon by the manufacturer and the purchaser.6.3 Preparation of Test Specimens Metallic

23、 and metallic-coated specimens may be solvent cleaned before testing, usinga suitable solvent such as alcohol, ethyl ether, acetone orpetroleum ether. Solvents that are corrosive or will depositprotective films shall not be used.6.4 Slurry ApplicationApply the Corrodkote slurry to thespecimen using

24、a clean paint brush. Dip the brush in theCorrodkote slurry and with a circular motion, completely coverthe specimen. Then smooth out the coating by brushing lightlyin one direction. Allow the specimens to dry at room tempera-ture and at a relative humidity less than 50 % for 1 h beforeplacing them i

25、n the humidity chamber. Should it be desirable tocut test specimens from parts or from preplated, or otherwisecoated steel sheet, the cut edges shall be protected by coatingthem with paint, wax, tape, or other effective media so that thedevelopment of a galvanic effect between such edges and theadja

26、cent plated or otherwise coated-metal surfaces, is pre-vented.6.5 Position of Specimens During Test The position of thespecimens in the humidity chamber during the test is notcritical as long as they do not touch each other and the supportsdo not touch the test areas that have been coated with theCo

27、rrodkote slurry.6.6 Conditions in the Humidity Chamber The exposurezone of the humidity chamber shall be maintained at 38 6 2C.The relative humidity of the exposure zone of the chambershall be maintained between 80 and 90 % shall not producecondensation on any of the parts.NOTE 3A fan or blower may

28、be used in the chamber to maintainuniform temperature and humidity. The amount of air circulation in thechamber necessary to maintain these conditions must be determined foreach chamber. An Abbeon certified hygrometer Model No. 167, or itsequivalent4is a suitable instrument for measuring the relativ

29、e humidity ofthe exposure zone of the humidity chamber.6.7 Test CycleExposure in the humidity chamber shall becontinuous for periods up to 20 h. A single test period up to 20h shall be considered as one cycle. Continuous operationimplies that the humidity chamber be closed and operatedcontinuously e

30、xcept for the short interruptions necessary toplace or remove test specimens. Operations shall be so sched-uled that these interruptions are held to a minimum. Whenmore than one test cycle of 20 h or less is specified, the testspecimen shall be treated as outlined in 6.9 after each testcycle. Fresh

31、slurry shall be applied for each succeeding cycle.After the last test cycle, the test specimen shall be treated asoutlined in 6.9.6.8 Period of TestThe period of each test cycle as well asthe number of test cycles required, shall be as specified in thespecifications for the material or product being

32、 tested, or asmutually agreed upon between the manufacturer and thepurchaser.6.9 Cleaning of Testing Specimens Treat the specimenafter each test cycle as outlined in 6.9.1.After the last test cycleand if the specimen is to be inspected between test cycles, treatthe specimens as outlined in 6.9.1 and

33、 6.9.2.6.9.1 Remove the specimen from the humidity chamber.Clean the specimen using fresh running water and a piece ofclean cheesecloth or suitable synthetic sponge to remove all ofthe slurry. A mild abrasive such as a water paste of tripoli maybe used to remove any adhering materials.6.9.2 Since th

34、e cleaning operation described in 6.9.1 willremove any corrosion products, it will be necessary to rede-velop the points of failure. This may be done in several ways,such as exposure for4hinthesalt spray cabinet described inPractice B117, exposure for 24 h in a humidity cabinetoperated at 38C and 10

35、0 % relative humidity withcondensation, or some other method that will cause corrosionof the basis metal without any significant damage to thecoating.NOTE 4Corrosion products visible on the test specimen with theslurry in place are not necessarily caused by points of failure in thecoating. Particles

36、 of metal accidentally deposited on the test specimenbefore humidity exposure will also cause visible corrosion products.7. Evaluation of Results7.1 After redevelopment of points of failure, as outlined in6.9.2, make a careful and immediate examination for the extentof corrosion of the test specimen

37、 or for other failures asrequired in the specifications covering the material or productbeing tested or by agreement between the manufacturer and thepurchaser.4Model No. 167 hygrometer may be purchased from Sepor Laboratory SupplyCo., P.O. Box 1252, 718 N. Fries, Wilmington, CA 90748.B380 97 (2018)2

38、8. Report8.1 The report shall contain the following information,unless otherwise prescribed in the specifications covering thematerial or product being tested:8.1.1 The title, designation, and year of issue of this method,8.1.2 Readings of temperature within the exposure zone ofthe humidity chamber,

39、8.1.3 Readings of relative humidity within the exposurezone of the chamber,8.1.4 Type of specimen and its dimensions or number, ordescription of part,8.1.5 Exposure period for each cycle and number of cycles,8.1.6 Results of all inspections, and8.1.7 Method of redeveloping corrosion spots.9. Precisi

40、on and Bias9.1 The Corrodkote test provides reliable results if thecomposition of the slurry, the humidity in the chamber, thetemperature, and other factors discussed in this standard arecarefully controlled. The precision and bias are being deter-mined in interlaboratory test programs.ASTM Internat

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