ASTM B858-06
(Test Method)Standard Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
Standard Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
SIGNIFICANCE AND USE
This test method is an accelerated test to determine if a copper alloy product will be susceptible to stress-corrosion cracking when exposed to a particular atmospheric condition during service with the appropriate risk level—see Annex A1.
5.1.1 This test method is generally intended to determine if a copper alloy product will crack because of internal stresses when subjected to the test, and is not intended for testing assemblies under applied stress. If used for this purpose, it shall be for information only and not a cause for rejection of the assembly, its component parts, or the original mill product.
SCOPE
1.1 This test method describes a procedure to determine the presence of residual stresses in wrought copper alloy products that may lead to stress corrosion cracking. An ammonia vapor atmosphere is used as an accelerated test.
1.2 This test method is only suitable for products fabricated from copper alloys that are known to be susceptible to stress corrosion cracking in ammonia vapor atmospheres. It is intended to create an environmental condition of reproducible severity.Note 1It is well known that the critical step in the cracking mechanism is the development of an environment in the condensate film that occurs on the surface of the test specimen, and is rich in copper complex ions.
1.3 The severity of this test method depends upon the pH of the corrosive solution. In are given four different atmospheres to which the product may be exposed, and the appropriate pH of the solution to be used for the test, depending on the risk level associated with the intended application.
1.3.1 The appropriate pH value for the test shall be specified in the product specification, or as per established agreement between the supplier and purchaser, with respect to the alloy and its intended application.
1.4 UnitsThe values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B858–06
Standard Test Method for
Ammonia Vapor Test for Determining Susceptibility to
1
Stress Corrosion Cracking in Copper Alloys
This standard is issued under the fixed designation B858; 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* 2. Referenced Documents
2
1.1 This test method describes a procedure to determine the 2.1 ASTM Standards:
presence of residual stresses in wrought copper alloy products B154 Test Method for Mercurous Nitrate Test for Copper
that may lead to stress corrosion cracking. An ammonia vapor Alloys
atmosphere is used as an accelerated test. B846 Terminology for Copper and Copper Alloys
1.2 This test method is only suitable for products fabricated D1193 Specification for Reagent Water
from copper alloys that are known to be susceptible to stress
3. Terminology
corrosion cracking in ammonia vapor atmospheres. It is in-
3.1 For definitions of terms related to copper and copper
tended to create an environmental condition of reproducible
severity. alloys, refer to Terminology B846.
3.2 Definitions:
NOTE 1—It is well known that the critical step in the cracking
3.2.1 applied stress, n—stress in a body as a result of
mechanism is the development of an environment in the condensate film
application of an external load.
that occurs on the surface of the test specimen, and is rich in copper
complex ions.
4. Summary of Test Method
1.3 The severity of this test method depends upon the pH of
4.1 The prepared test specimen is placed in a closed
the corrosive solution. In Annex A1 are given four different
container and exposed to ammonia vapor with a specific pH at
atmospheres to which the product may be exposed, and the
ambient temperature for 24 h. Upon removal from the test
appropriate pH of the solution to be used for the test,
atmosphere, the test specimen is examined for the presence of
depending on the risk level associated with the intended
cracks.
application.
1.3.1 TheappropriatepHvalueforthetestshallbespecified
5. Significance and Use
in the product specification, or as per established agreement
5.1 This test method is an accelerated test to determine if a
between the supplier and purchaser, with respect to the alloy
copper alloy product will be susceptible to stress-corrosion
and its intended application.
cracking when exposed to a particular atmospheric condition
1.4 Units—The values stated in SI units are to be regarded
during service with the appropriate risk level—see Annex A1.
as the standard. No other units of measurement are included in
5.1.1 This test method is generally intended to determine if
this standard.
a copper alloy product will crack because of internal stresses
1.5 This standard does not purport to address all of the
when subjected to the test, and is not intended for testing
safety concerns, if any, associated with its use. It is the
assembliesunderappliedstress.Ifusedforthispurpose,itshall
responsibility of the user of this standard to establish appro-
be for information only and not a cause for rejection of the
priate safety and health practices and determine the applica-
assembly, its component parts, or the original mill product.
bility of regulatory limitations prior to use.
1
This test method is under the jurisdiction ofASTM Committee B05 on Copper
and Copper Alloys and is the direct responsibility of Subcommittee B05.06 on
2
Methods of Test. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 15, 2006. Published March 2006. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 2001 as B858 – 01. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0858-06. the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B858–06
6. Apparatus peroxide solution may be added to the pickling solution (for
example, 20 to 30 mL of hydrogen peroxide solution per litre
6.1 pH meter.
of pickling solution).
6.2 Closed vessel, such as a desiccator.
6.3 Equipment for examining test pieces at 103 to 153
9. Test Specimen Preparation
magnification.
9.1 The test specimen size shall be prescribed in the
specification of the product or part being tested. In the event
7. Reagents and Materials
that a test specimen size is not prescribed in a given rod, wire,
7.1 Purity of Reagents—Reagent grad
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:B858–95 Designation:B858–06
Standard Test Method for
Determination of Susceptibility to Stress Corrosion
Cracking in Copper Alloys Using an Ammonia Vapor
TestAmmonia Vapor Test for Determining Susceptibility to
1
Stress Corrosion Cracking in Copper Alloys
This standard is issued under the fixed designation B 858; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1This test method describes a procedure that may be used to determine the presence of residual stresses which may lead to
stress corrosion cracking of wrought copper alloy products. This test method uses an ammonia atmosphere to simulate service
conditions under which stress corrosion cracking may occur.
1.2This test method is only suitable for products fabricated from copper alloys that are known to be susceptible to stress
corrosion cracking in ammonia vapor atmospheres. It is intended to create an environmental condition of reproducible severity, but
it is well known that the critical step in the cracking mechanism is the development of an environment in the condensate film that
occurs on the surface of the test specimen, which is rich in copper complex ions.
1.3This test method is a conversion of ISO 6957, “Copper Alloys—Ammonia Test for Stress Corrosion Resistance.”
1.4The severity of this test method depends upon the pH of the corrosive solution. In
1.1 This test method describes a procedure to determine the presence of residual stresses in wrought copper alloy products that
may lead to stress corrosion cracking. An ammonia vapor atmosphere is used as an accelerated test.
1.2 This test method is only suitable for products fabricated from copper alloys that are known to be susceptible to stress
corrosion cracking in ammonia vapor atmospheres. It is intended to create an environmental condition of reproducible severity.
NOTE 1—It is well known that the critical step in the cracking mechanism is the development of an environment in the condensate film that occurs
on the surface of the test specimen, and is rich in copper complex ions.
1.3 The severity of this test method depends upon the pH of the corrosive solution. In Annex A1 are given four different
atmospheres to which the product may be exposed, and the appropriate pH of the solution to be used for the test, depending on
the risk level associated with the intended application.
1.4.1TheappropriatepHvalueforthetestshallbespecifiedintheproductspecification,orasperestablishedagreementbetween
the supplier and purchaser, with respect to the alloy and its intended application.
1.5The values stated in SI units are the standard.
1.6
1.3.1 The appropriate pH value for the test shall be specified in the product specification, or as per established agreement
between the supplier and purchaser, with respect to the alloy and its intended application.
1.4 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this
standard.
1.5 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
1
This test method is under the jurisdiction ofASTM Committee B05 on Copper and CopperAlloys and is the direct responsibility of Subcommittee B05.06 on Methods
of Test.
Current edition approved June 15, 1995. Published August 1995.
Current edition approved March 15, 2006. Published March 2006. Originally approved in 1995. Last previous edition approved in 2001 as B 858 – 01.
2
This test method is a conversion of ISO 6957 “Copper Alloys—Ammonia Test for Stress Corrosion Resistance.” Additional background information is included in
Appendix X1.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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