1、Designation:G19208(Reapproved 2014)Standard Test Method forDetermining the Crevice Repassivation Potential ofCorrosion-Resistant Alloys Using a Potentiodynamic-Galvanostatic-Potentiostatic Technique1This standard is issued under the fixed designation G192;the number immediately following the designa
2、tion 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 a procedure for
3、conductinganodic polarization studies to determine the crevice repassiva-tion potential for corrosionresistant alloys.The concept of therepassivation potential is similar to that of the protectionpotential given in Reference Test Method G5.1.2 The test method consists in applying successivelypotenti
4、odynamic,galvanostatic,and potentiostatic treatmentsfor the initial formation and afterward repassivation of crevicecorrosion.1.3 This test method is a complement to Test Method G61.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informatio
5、nonly.1.5 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
6、 Documents2.1 ASTM Standards:2B575 Specification for Low-Carbon Nickel-Chromium-Molybdenum,Low-CarbonNickel-Chromium-Molybdenum-Copper,Low-Carbon Nickel-Chromium-Molybdenum-Tantalum,Low-Carbon Nickel-Chromium-Molybdenum-Tungsten,andLow-CarbonNickel-Molybdenum-Chromium Alloy Plate,Sheet,and StripD119
7、3 Specification for Reagent WaterE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodG1 Practice for Preparing,Cleaning,and Evaluating Corro-sion Test SpecimensG5 Reference Test Method for Making PotentiodynamicAnodic Polarization MeasurementsG15 Terminolo
8、gy Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G48 Test Methods for Pitting and Crevice Corrosion Resis-tance of Stainless Steels and Related Alloys by Use ofFerric Chloride SolutionG61 Test Method for Conducting Cyclic PotentiodynamicPolarization Measurements for Localized Corrosio
9、n Sus-ceptibility of Iron-,Nickel-,or Cobalt-Based AlloysG78 Guide for Crevice Corrosion Testing of Iron-Base andNickel-Base Stainless Alloys in Seawater and OtherChloride-Containing Aqueous Environments3.Terminology3.1 DefinitionsFor definitions of corrosion-related termsused in this test method,se
10、e Terminology G15.4.Summary of Test Method4.1 This anodic polarization test method combines tech-niques such as potentiodynamic,galvanostatic,and potentio-static polarization methods.This test method is called theTsujikawa-Hisamatsu Electrochemical(THE)test method tohonor the two precursors of this
11、technique(see 1 and 2).4Thenew technique will be called the THE test method.This newTHE test method is more time-consuming than the alreadywell-established cyclic potentiodynamic polarization(CPP)described in Test Method G61.4.2 The THE test method can be used with any corrosion-resistant alloy,but
12、it was developed by studying Alloy 22(UNS N06022).The composition and other properties ofAlloy22 are given in Specification B575.Alloy 22 is a nickelbasedalloy containing approximately 22wt%Cr,13wt%Mo,3wt%1This test method is under the jurisdiction of ASTM Committee G01 onCorrosion of Metals and is
13、the direct responsibility of Subcommittee G01.11 onElectrochemical Measurements in Corrosion Testing.Current edition approved Nov.1,2014.Published November 2014.Originallyapproved in 2008.Last previous edition approved in 2008 as G19208.DOI:10.1520/G0192-08R14.2For referenced ASTM standards,visit th
14、e 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.3The last approved version of this historical standard is referenced onwww.astm.org.4The boldface numbers
15、 in parentheses refer to a list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 W and 3wt%Fe.The THE test method is a complement to thecyclic potentiodynamic polarization(CPP)described in TestMetho
16、d G61.CPP may be used as a first fast screening methodand THE test method for fine-tuning the repassivation potentialfor crevice corrosion when the environment is not highlyaggressive(3-6).The THE test method has also been applied toother highly corrosionresistant alloys,such as Titanium grade7(Ref 7).4.3 The THE test method can be used with any electrolytesolution.A standard 1 M NaCl solution at 90C or lowertemperature may be used to compare alloys of interest.Theround robin described in Sectio