ASTM G150-18
(Test Method)Standard Test Method for Electrochemical Critical Pitting Temperature Testing of Stainless Steels and Related Alloys
Standard Test Method for Electrochemical Critical Pitting Temperature Testing of Stainless Steels and Related Alloys
SIGNIFICANCE AND USE
5.1 This test method provides a prediction of the resistance to stable propagating pitting corrosion of stainless steels and related alloys in a standard medium (see Note 1). The CPT test can be used for product acceptance, alloy development studies, and manufacturing control. In the case of product acceptance, the supplier and user must agree upon the preconditioning of the specimen with regard to surface finish. The test is not intended for design purposes since the test conditions accelerate corrosion in a manner that does not simulate any actual service environment.
5.2 Another method to determine the potential independent CPT with an electrochemical technique has been discussed in the literature (1-4). This test method involves a potentiodynamic (potential sweep) procedure performed on specimens at different temperatures. A comparison (2) of the test method described in this test method and the potentiodynamic technique has indicated no difference in the test result obtained.
SCOPE
1.1 This test method covers a procedure for the evaluation of the resistance of stainless steel and related alloys to pitting corrosion based on the concept of the determination of a potential independent critical pitting temperature (CPT).
1.2 This test method applies to wrought and cast products including but not restricted to plate, sheet, tubing, bar, forgings, and welds, (see Note 1).
Note 1: Examples of CPT measurements on sheet, plate, tubing, and welded specimens for various stainless steels can be found in Ref (1).2 See the research reports (Section 14).
1.3 The standard parameters recommended in this test method are suitable for characterizing the CPT of austenitic stainless steels and other related alloys with a corrosion resistance ranging from that corresponding to solution annealed UNS S31600 (Type 316 stainless steel) to solution annealed UNS S31254 (6 % Mo stainless steel).
1.4 This test method may be extended to stainless steels and other alloys related to stainless steel that have a CPT outside the measurement range given by the standard parameters described in this test method. Appropriate test potential and solution must then be determined.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Buy Standard
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G150 − 18
Standard Test Method for
Electrochemical Critical Pitting Temperature Testing of
1
Stainless Steels and Related Alloys
This standard is issued under the fixed designation G150; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.1 This test method covers a procedure for the evaluation
Barriers to Trade (TBT) Committee.
of the resistance of stainless steel and related alloys to pitting
corrosion based on the concept of the determination of a
2. Referenced Documents
potential independent critical pitting temperature (CPT).
3
2.1 ASTM Standards:
1.2 This test method applies to wrought and cast products
D1193Specification for Reagent Water
includingbutnotrestrictedtoplate,sheet,tubing,bar,forgings,
D1293Test Methods for pH of Water
and welds, (see Note 1).
E177Practice for Use of the Terms Precision and Bias in
NOTE 1—Examples of CPT measurements on sheet, plate, tubing, and
ASTM Test Methods
2
weldedspecimensforvariousstainlesssteelscanbefoundinRef (1). See
E691Practice for Conducting an Interlaboratory Study to
the research reports (Section 14).
Determine the Precision of a Test Method
1.3 The standard parameters recommended in this test
G1Practice for Preparing, Cleaning, and Evaluating Corro-
method are suitable for characterizing the CPT of austenitic
sion Test Specimens
stainless steels and other related alloys with a corrosion
G3Practice for Conventions Applicable to Electrochemical
resistance ranging from that corresponding to solution an-
Measurements in Corrosion Testing
nealed UNS S31600 (Type 316 stainless steel) to solution
G5Reference Test Method for Making Potentiodynamic
annealed UNS S31254 (6 % Mo stainless steel).
Anodic Polarization Measurements
1.4 Thistestmethodmaybeextendedtostainlesssteelsand
G46Guide for Examination and Evaluation of Pitting Cor-
other alloys related to stainless steel that have a CPT outside rosion
the measurement range given by the standard parameters
G107Guide for Formats for Collection and Compilation of
described in this test method. Appropriate test potential and
Corrosion Data for Metals for Computerized Database
solution must then be determined.
Input
G193Terminology and Acronyms Relating to Corrosion
1.5 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
3. Terminology
standard.
3.1 Definitions:
1.6 This standard does not purport to address all of the
3.1.1 critical pitting temperature (CPT)—the lowest tem-
safety concerns, if any, associated with its use. It is the
perature on the test surface at which stable propagating pitting
responsibility of the user of this standard to establish appro-
occurs under specified test conditions indicated by a rapid
priate safety, health, and environmental practices and deter-
increase beyond a set limit of the measured anodic current
mine the applicability of regulatory limitations prior to use.
density of the specimen.
1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.1.2 pitting potential range—the range of measured poten-
ization established in the Decision on Principles for the
tials where pitting is initiated. This potential range only exists
above the minimum critical pitting temperature; see also
Appendix X1.
1
ThistestmethodisunderthejurisdictionofG01onCorrosionofMetalsandis
thedirectresponsibilityofSubcommitteeG01.11onElectrochemicalMeasurements
in Corrosion Testing.
Current edition approved May 1, 2018. Published May 2018. Originally
3
approved in 1997. Last previous edition approved in 2013 as G150 – 13. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/G0150-18. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof Standards volume information, refer to the standard’s Document Summary page on
this standard. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G150 − 18
3.1.3 potential dependent CPT—the CPT determined at a the specimen with regard to surface finish. The test is not
potential within the pitting potential ra
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G150 − 13 G150 − 18
Standard Test Method for
Electrochemical Critical Pitting Temperature Testing of
1
Stainless Steels and Related Alloys
This standard is issued under the fixed designation G150; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a procedure for the evaluation of the resistance of stainless steel and related alloys to pitting
corrosion based on the concept of the determination of a potential independent critical pitting temperature (CPT).
1.2 This test methodsmethod applies to wrought and cast products including but not restricted to plate, sheet, tubing, bar,
forgings, and welds, (see Note 1).
2
NOTE 1—Examples of CPT measurements on sheet, plate, tubing, and welded specimens for various stainless steels can be found in Ref (1). See the
research reports (Section 14).
1.3 The standard parameters recommended in this test method are suitable for characterizing the CPT of austenitic stainless
steels and other related alloys with a corrosion resistance ranging from that corresponding to solution annealed UNS S31600 (Type
316 stainless steel) to solution annealed UNS S31254 (6 % Mo stainless steel).
1.4 This test method may be extended to stainless steels and other alloys related to stainless steel that have a CPT outside the
measurement range given by the standard parameters described in this test method. Appropriate test potential and solution must
then be determined.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D1293 Test Methods for pH of Water
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
G3 Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing
G5 Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements
G46 Guide for Examination and Evaluation of Pitting Corrosion
G107 Guide for Formats for Collection and Compilation of Corrosion Data for Metals for Computerized Database Input
G193 Terminology and Acronyms Relating to Corrosion
1
This test method is under the jurisdiction of G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.11 on Electrochemical Measurements in
Corrosion Testing.
Current edition approved May 1, 2013May 1, 2018. Published May 2013May 2018. Originally approved in 1997. Last previous edition approved in 20102013 as G150
– 99 (2010). 13. DOI: 10.1520/G0150-13.10.1520/G0150-18.
2
The boldface numbers in parenthesisparentheses refer to the list of references at the end of this standard.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G150 − 18
3. Terminology
3.1 Definitions:
3.1.1 critical pitting temperature (CPT)—the lowest temperature on the test surface at which stable propagating pitting occurs
under specified test conditions indicated by a rapid increase beyond a set limit of the measured anodic current density of the
specimen.
3.1.2 pitting potential range—the range of measured potentials where pitting
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.