ASTM G8-96(2019)
(Test Method)Standard Test Methods for Cathodic Disbonding of Pipeline Coatings
Standard Test Methods for Cathodic Disbonding of Pipeline Coatings
SIGNIFICANCE AND USE
4.1 Breaks or holidays in pipe coatings may expose the pipe to possible corrosion, since after a pipe has been installed underground, the surrounding earth will be more or less moisture-bearing and it constitutes an effective electrolyte. Damage to pipe coating is almost unavoidable during transportation and construction. Normal soil potentials as well as applied cathodic protection potentials may cause loosening of the coating, beginning at holiday edges, in some cases increasing the apparent size of the holiday. Holidays may also be caused by such potentials. While apparently loosened coating and cathodic holidays may not result in corrosion, this test provides accelerated conditions for loosening to occur and therefore gives a measure of resistance of coatings to this type of action.
4.2 The effects of the test may be evaluated by either physical examination or monitoring the current drawn by the test specimen and both of these two. Usually there is no correlation between the two methods of evaluation but both methods are significant. Physical examination consists of assessing the effective contact of the coating with the metal surface in terms of observed differences in the relative adhesive bond. It is usually found that the electrically stressed area propagates from the holiday to a boundary where the loosened coating leaves off for the more effective contact or bond attributed to an original condition throughout the specimen before electrical stressing was applied. Assumptions associated with test results include the following:
4.2.1 Attempting to loosen or disbond the coating at a new test hole made in the coating in an area that was not immersed represents maximum adhesion or bond as measured by the lifting technique used, and that the same lifting technique can be used at a test hole that was immersed thereby providing a means of comparing relative resistance to lifting.
4.2.2 Any relatively lesser bonded area at the immersed test holes in the coa...
SCOPE
1.1 These test methods cover accelerated procedures for simultaneously determining comparative characteristics of insulating coating systems applied to steel pipe exterior for the purpose of preventing or mitigating corrosion that may occur in underground service where the pipe will be in contact with inland soils and may or may not receive cathodic protection. They are intended for use with samples of coated pipe taken from commercial production and are applicable to such samples when the coating is characterized by function as an electrical barrier.
1.2 This test method is intended for testing coatings submerged or immersed in the test solution at room temperature. When it is impractical to submerge or immerse the test specimen, Test Method G95 may be considered where the test cell is cemented to the surface of the coated pipe specimen. If higher temperatures are required, see Test Method G42. If a specific test method is required with no options, see Test Method G80.
1.3 The values stated in SI units to 3 significant decimals are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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.
1.5 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.
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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: G8 − 96 (Reapproved 2019)
Standard Test Methods for
1
Cathodic Disbonding of Pipeline Coatings
This standard is issued under the fixed designation G8; the number immediately following the designation indicates the year of original
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 These test methods cover accelerated procedures for
G12Test Method for Nondestructive Measurement of Film
simultaneously determining comparative characteristics of in-
Thickness of Pipeline Coatings on Steel (Withdrawn
sulating coating systems applied to steel pipe exterior for the
3
2013)
purposeofpreventingormitigatingcorrosionthatmayoccurin
G42Test Method for Cathodic Disbonding of Pipeline
underground service where the pipe will be in contact with
Coatings Subjected to Elevated Temperatures
inland soils and may or may not receive cathodic protection.
G80Test Method for Specific Cathodic Disbonding of Pipe-
They are intended for use with samples of coated pipe taken
3
line Coatings (Withdrawn 2013)
from commercial production and are applicable to such
G95TestMethodforCathodicDisbondmentTestofPipeline
samples when the coating is characterized by function as an
Coatings (Attached Cell Method)
electrical barrier.
3. Summary of Test Method
1.2 This test method is intended for testing coatings sub-
merged or immersed in the test solution at room temperature.
3.1 Both of the two test methods described subject the
When it is impractical to submerge or immerse the test
coating on the test specimen to electrical stress in a highly
specimen, Test Method G95 may be considered where the test conductive, alkaline electrolyte. Electrical stress is obtained
cell is cemented to the surface of the coated pipe specimen. If either by means of a sacrificial magnesium anode or from an
impressed current system. The coating is perforated before
higher temperatures are required, see Test Method G42.Ifa
starting the test.
specific test method is required with no options, see Test
3.1.1 In Method A, a magnesium anode is used with no
Method G80.
electrical monitoring during the test period. The results are
1.3 ThevaluesstatedinSIunitsto3significantdecimalsare
determined by physical examination after the test period is
toberegardedasthestandard.Thevaluesgiveninparentheses
concluded.
are for information only.
3.1.2 In Method B, either a magnesium anode or an im-
pressedcurrentsystemmaybeused.Electricalinstrumentation
1.4 This standard does not purport to address all of the
is provided for measuring the current in the cell circuit. The
safety concerns, if any, associated with its use. It is the
electrical potential is also measured, and upon conclusion of
responsibility of the user of this standard to establish appro-
the test period, the test specimen is physically examined.
priate safety, health, and environmental practices and deter-
3.1.3 In both test methods physical examination is con-
mine the applicability of regulatory limitations prior to use.
ducted by comparing the extent of loosened or disbonded
1.5 This international standard was developed in accor-
coating at the perforations in the immersed area with extent of
dance with internationally recognized principles on standard-
loosened or disbonded coating at a new test hole in the coating
ization established in the Decision on Principles for the
made in an area that was not immersed.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Significance and Use
Barriers to Trade (TBT) Committee.
4.1 Breaksorholidaysinpipecoatingsmayexposethepipe
to possible corrosion, since after a pipe has been installed
1
These test methods are under the jurisdiction of ASTM Committee D01 on
2
Paint and Related Coatings, Materials, and Applications and are the direct For referenced ASTM standards, visit the ASTM website, www.astm.org, or
responsibility of Subcommittee D01.48 on Durability of Pipeline Coating and contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Linings. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2019. Published June 2019. Originally the ASTM website.
3
approved in 1969. Last previous edition approved in 2010 as G8–96(2010). DOI: The last approved version of this historical standard is referenced on
10.1520/G0008-96R19. www.astm.org.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken
...
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: G8 − 96 (Reapproved 2019)
Standard Test Methods for
1
Cathodic Disbonding of Pipeline Coatings
This standard is issued under the fixed designation G8; 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
2.1 ASTM Standards:
1.1 These test methods cover accelerated procedures for
G12 Test Method for Nondestructive Measurement of Film
simultaneously determining comparative characteristics of in-
Thickness of Pipeline Coatings on Steel (Withdrawn
sulating coating systems applied to steel pipe exterior for the
3
2013)
purpose of preventing or mitigating corrosion that may occur in
G42 Test Method for Cathodic Disbonding of Pipeline
underground service where the pipe will be in contact with
Coatings Subjected to Elevated Temperatures
inland soils and may or may not receive cathodic protection.
G80 Test Method for Specific Cathodic Disbonding of Pipe-
They are intended for use with samples of coated pipe taken
3
line Coatings (Withdrawn 2013)
from commercial production and are applicable to such
G95 Test Method for Cathodic Disbondment Test of Pipeline
samples when the coating is characterized by function as an
Coatings (Attached Cell Method)
electrical barrier.
3. Summary of Test Method
1.2 This test method is intended for testing coatings sub-
merged or immersed in the test solution at room temperature.
3.1 Both of the two test methods described subject the
When it is impractical to submerge or immerse the test coating on the test specimen to electrical stress in a highly
specimen, Test Method G95 may be considered where the test conductive, alkaline electrolyte. Electrical stress is obtained
either by means of a sacrificial magnesium anode or from an
cell is cemented to the surface of the coated pipe specimen. If
impressed current system. The coating is perforated before
higher temperatures are required, see Test Method G42. If a
starting the test.
specific test method is required with no options, see Test
3.1.1 In Method A, a magnesium anode is used with no
Method G80.
electrical monitoring during the test period. The results are
1.3 The values stated in SI units to 3 significant decimals are
determined by physical examination after the test period is
to be regarded as the standard. The values given in parentheses
concluded.
are for information only.
3.1.2 In Method B, either a magnesium anode or an im-
pressed current system may be used. Electrical instrumentation
1.4 This standard does not purport to address all of the
is provided for measuring the current in the cell circuit. The
safety concerns, if any, associated with its use. It is the
electrical potential is also measured, and upon conclusion of
responsibility of the user of this standard to establish appro-
the test period, the test specimen is physically examined.
priate safety, health, and environmental practices and deter-
3.1.3 In both test methods physical examination is con-
mine the applicability of regulatory limitations prior to use.
ducted by comparing the extent of loosened or disbonded
1.5 This international standard was developed in accor-
coating at the perforations in the immersed area with extent of
dance with internationally recognized principles on standard-
loosened or disbonded coating at a new test hole in the coating
ization established in the Decision on Principles for the
made in an area that was not immersed.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Significance and Use
Barriers to Trade (TBT) Committee.
4.1 Breaks or holidays in pipe coatings may expose the pipe
to possible corrosion, since after a pipe has been installed
1
These test methods are under the jurisdiction of ASTM Committee D01 on
2
Paint and Related Coatings, Materials, and Applications and are the direct For referenced ASTM standards, visit the ASTM website, www.astm.org, or
responsibility of Subcommittee D01.48 on Durability of Pipeline Coating and contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Linings. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2019. Published June 2019. Originally the ASTM website.
3
approved in 1969. Last previous edition approved in 2010 as G8 – 96 (2010). DOI: The last approved version of this historical standard is referenced on
10.1520/G0008-96R19. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1
...
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: G8 − 96 (Reapproved 2010) G8 − 96 (Reapproved 2019)
Standard Test Methods for
1
Cathodic Disbonding of Pipeline Coatings
This standard is issued under the fixed designation G8; 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 These test methods cover accelerated procedures for simultaneously determining comparative characteristics of insulating
coating systems applied to steel pipe exterior for the purpose of preventing or mitigating corrosion that may occur in underground
service where the pipe will be in contact with inland soils and may or may not receive cathodic protection. They are intended for
use with samples of coated pipe taken from commercial production and are applicable to such samples when the coating is
characterized by function as an electrical barrier.
1.2 This test method is intended for testing coatings submerged or immersed in the test solution at room temperature. When it
is impractical to submerge or immerse the test specimen, Test Method G95 may be considered where the test cell is cemented to
the surface of the coated pipe specimen. If higher temperatures are required, see Test Method G42. If a specific test method is
required with no options, see Test Method G80.
1.3 The values stated in SI units to 3 significant decimals are to be regarded as the standard. The values given in parentheses
are for information only.
1.4 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.
1.5 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
2
2.1 ASTM Standards:
3
G12 Test Method for Nondestructive Measurement of Film Thickness of Pipeline Coatings on Steel (Withdrawn 2013)
G42 Test Method for Cathodic Disbonding of Pipeline Coatings Subjected to Elevated Temperatures
3
G80 Test Method for Specific Cathodic Disbonding of Pipeline Coatings (Withdrawn 2013)
G95 Test Method for Cathodic Disbondment Test of Pipeline Coatings (Attached Cell Method)
3. Summary of Test Method
3.1 Both of the two test methods described subject the coating on the test specimen to electrical stress in a highly conductive,
alkaline electrolyte. Electrical stress is obtained either by means of a sacrificial magnesium anode or from an impressed current
system. The coating is perforated before starting the test.
3.1.1 In Method A, a magnesium anode is used with no electrical monitoring during the test period. The results are determined
by physical examination after the test period is concluded.
3.1.2 In Method B, either a magnesium anode or an impressed current system may be used. Electrical instrumentation is
provided for measuring the current in the cell circuit. The electrical potential is also measured, and upon conclusion of the test
period, the test specimen is physically examined.
1
These test methods are under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and are the direct responsibility of
Subcommittee D01.48 on Durability of Pipeline Coating and Linings.
Current edition approved Dec. 1, 2010June 1, 2019. Published December 2010June 2019. Originally approved in 1969. Last previous edition approved in 20032010 as
ε1
G8 – 96 (2003)(2010). . DOI: 10.1520/G0008-96R10.10.1520/G0008-96R19.
2
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.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G8 − 96 (2019)
3.1.3 In both test methods ph
...
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