ASTM G80-88(1998)
(Test Method)Standard Test Method for Specific Cathodic Disbonding of Pipeline Coatings (Withdrawn 2007)
Standard Test Method for Specific Cathodic Disbonding of Pipeline Coatings (Withdrawn 2007)
SCOPE
1.1 This test method covers an accelerated procedure 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 natural soils and may or may not receive cathodic protection. It is intended for use with samples of coated pipe taken from commercial production and is applicable to such samples when the coating is characterized by function as an electrical barrier.
1.2 This test method is specific with no options. For alternative methods of test see Test Methods G8.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 This standard does not purport to address all of the safety problems, 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.
WITHDRAWN RATIONALE
This test method covers an accelerated procedure 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 natural soils and may or may not receive cathodic protection. It is intended for use with samples of coated pipe taken from commercial production and is applicable to such samples when the coating is characterized by function as an electrical barrier.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in March 2007 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: G 80 – 88 (Reapproved 1998)
Standard Test Method for
Specific Cathodic Disbonding of Pipeline Coatings
ThisstandardisissuedunderthefixeddesignationG80;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope disbonding coating at the perforations in the immersed area
with loosened or disbonded coating at a new test hole in the
1.1 This test method covers an accelerated procedure for
coating made in an area that was not immersed.
simultaneously determining comparative characteristics of in-
sulating coating systems applied to steel pipe exterior for the
4. Significance and Use
purposeofpreventingormitigatingcorrosionthatmayoccurin
4.1 Breaksorholidaysinpipecoatingsmayexposethepipe
underground service where the pipe will be in contact with
to possible corrosion, since after a pipe has been installed
naturalsoilsandmayormaynotreceivecathodicprotection.It
underground, the surrounding earth will be more or less
is intended for use with samples of coated pipe taken from
moisture-bearingandconstitutesaneffectiveelectrolyte.Dam-
commercialproductionandisapplicabletosuchsampleswhen
agetopipecoatingisalmostunavoidableduringtransportation
the coating is characterized by function as an electrical barrier.
and construction. Normal soil potentials as well as applied
1.2 This test method is specific with no options. For
cathodic protection potentials may cause loosening of the
alternative methods of test see Test Methods G8.
coating, beginning at holiday edges, in some cases increasing
1.3 The values stated in SI units are to be regarded as the
the apparent size of the holiday. Holidays may also be caused
standard.
by such potentials. While apparently loosened coating and
1.4 This standard does not purport to address all of the
cathodicholidaysmaynotresultincorrosion,thistestprovides
safety concerns, if any, associated with its use. It is the
accelerated conditions for loosening to occur and therefore
responsibility of the user of this standard to establish appro-
gives a measure of resistance of coatings to this type of action.
priate safety and health practices and determine the applica-
4.2 The effects of the test are evaluated by physical exami-
bility of regulatory limitations prior to use.
nation assessing the effective contact of the coating with the
2. Referenced Documents metal surface in terms of observed differences in the relative
adhesive bond. It is usually found that the electrically stressed
2.1 ASTM Standards:
area propagates from the holiday to a boundary where the
G8 Test Methods for Cathodic Disbonding of Pipeline
2 loosened coating leaves off for the more effective contact or
Coatings
bond attributed to an original condition throughout the speci-
G12 TestMethodforNondestructiveMeasurementofFilm
2 men before electrical stressing was applied. Assumptions
Thickness of Pipeline Coatings on Steel
associated with test results include:
G16 Practice for Applying Statistics to Analysis of Corro-
3 4.2.1 That attempting to loosen or disbond the coating at a
sion Data
new test hole made in the coating in an area that was not
3. Summary of Test Method immersed represents maximum adhesion or bond as measured
by the lifting technique used, and that the same lifting
3.1 The coating on the test specimen is subjected to electri-
techniquecanbeusedatatestholethatwasimmersed,thereby
calstressinahighlyconductive,alkalineelectrolyte.Electrical
providing a means of comparing relative resistance to lifting.
stress is obtained by means of a sacrificial magnesium anode.
4.2.2 Thatanyrelativelylesserbondedareaattheimmersed
The coating is perforated before starting the test.
test holes in the coating was caused by electrical stressing and
3.2 Afterthetestperiodisconcluded,resultsaredetermined
was not attributable to any anomaly in the application process.
by physical examination and comparing the loosened or
Ability to resist disbondment is a desired quality on a com-
parative basis, but disbondment per se in this test is not
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
necessarily an adverse indication. The virtue of this test is that
and Related Coatings, Materials, andApplications and is the direct responsibility of
alldielectrictypecoatingsnowincommonusewilldisbondto
Subcommittee D01.48 on Durability of Nonmetallic Materials.
some degree thus providing a means of comparing one coating
Current edition approved Nov. 25, 1988. Published January 1989. Originally
published as G80–83. Last previous edition G80–83. with another. Bond strength is more important for proper
Annual Book of ASTM Standards, Vol 06.02.
Annual Book of ASTM Standards, Vol 03.02.
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G80
functioning of some coatings than others and the same mea- 5.1.8 Volt-Ohm-Meter, for initial testing of apparent coating
sured disbondment for two different coating systems may not resistance.
represent equivalent loss of corrosion protection.
5.1.9 Metallic Electrode, used temporarily with the volt-
4.2.3 That the current density appearing in this test is much ohm-meter to determine apparent initial holiday status of the
greater than that usually required for cathodic protection in test specimen.
natural, inland soil environments. 5.1.10 Additional Connecting Wires, 4107-cmil (14-gage
4.2.4 That there is no impact on test results caused by Awg), minimum, insulated copper.
interaction among multiple test samples in the test vessel. It is
suggested that if interference is suspected, clarification may be 6. Materials
obtained by testing a single sample in the test vessel.
6.1 The electrolyte shall consist of potable tap water with
the addition of 1 mass % of each of the following technical-
5. Apparatus
gradesalts,calculatedonananhydrousbasis:sodiumchloride,
sodium sulfate, and sodium carbonate. Use freshly prepared
5.1 Apparatus:
solution for each test.
5.1.1 Test Vessel—A nonconducting material shall be used
for the vessel or as a lining in a metallic vessel. Dimensions of 6.2 Materials for sealing the ends of coated pipe specimens
may consist of bituminous products, waxy, epoxy, or other
the vessel shall permit the following requirements:
materials, including molded elastomer or plastic end caps.
5.1.1.1 Test specimens shall be suspended vertically in the
6.3 Plywood or plastic material has been found suitable for
vesselwithatleast25.4mm(1-in.)clearancefromthebottom.
the construction of test vessel covers and for the support
5.1.1.2 Eachtestspecimenshallbeseparatedfromtheother
through apertures of test specimens and electrodes. Wood
specimens, from the anodes and from the walls of the test
dowels introduced through holes in the top ends of test
vessel by at least 38.1 mm (1.500 in.).
specimens have been found suitable for suspending test speci-
5.1.1.3 Depth of electrolyte shall permit the test length of
mens from the vessel cover.
the specimen to be immersed as required in 7.4.
5.1.2 Magnesium Anode—The anode shall be made of a
7. Test Specimen
magnesium alloy having a solution potential of−1.45 to−1.55
V with respect to a CuCuSO reference electrode in the
7.1 The test specimens shall be 60 mm (2.375 in.) O.D.
electrolyte given in 6.1. It shall have a surface area not less
Schedule 40 coated pipes prepared with their surface prepara-
than one third that of the total specimen area exposed to
tion and coatings procedure equivalent to that of production
electrolyte (outside area exposed only). The anode shall be
coated pipe, then cut and drilled as shown in Fig. 1. One end
provided with a factory-sealed, 4107-cmil(14-gage Awg),
shall be plugged or capped and sealed.
minimum,insulatedcopperwire.Anodeswithoutafactoryseal
7.2 Three test holes shall be made in the coating in each
may be used if the magnesium extends above the cover.
specimen, drilled 120° apart with one in the center and the
5.1.3 Connectors—Wiring from anode to test specimen
other two at locations one-fourth the distance from top and
shallbe4107-cmil(14-gageAwg),minimum,insulatedcopper.
bottom of the immersed test length. Each holiday shall be
Attachmenttothetestspecimenshallbebysoldering,brazing,
drilledsothattheangularconepointofthedrillwillfullyenter
orb
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