ASTM D2803-09
(Guide)Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal
Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal
SIGNIFICANCE AND USE
Some organic coatings applied to metal substrates exhibit filiform corrosion when there is a break in the coating film and the relative humidity is in the 70 to 95 % range.
This guide can be used to determine the susceptibility of organic coated metal substrates to the formation of filiform corrosion.
SCOPE
1.1 This guide covers three procedures for determining the susceptibility of organic-coated metal substrates to formation of filiform corrosion.
1.2 This guide is limited to the determination of whether filiform corrosion will occur between the organic coating and substrate.
1.3 The values stated in SI units 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 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.
Note 1—Procedure B of this standard is equivalent to ISO 4623.
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Designation: D2803 − 09
StandardGuide for Testing
Filiform Corrosion Resistance of Organic Coatings on
1
Metal
This standard is issued under the fixed designation D2803; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* Aluminum-Alloy Surfaces for Painting
D7091 Practice for Nondestructive Measurement of Dry
1.1 This guide covers three procedures for determining the
Film Thickness of Nonmagnetic Coatings Applied to
susceptibility of organic-coated metal substrates to formation
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
of filiform corrosion.
ings Applied to Non-Ferrous Metals
1.2 This guide is limited to the determination of whether
E104 Practice for Maintaining Constant Relative Humidity
filiform corrosion will occur between the organic coating and
by Means of Aqueous Solutions
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substrate.
2.2 International Standard:
1.3 The values stated in SI units are to be regarded as the ISO 4623–1 Paints and Varnishes—Determination of resis-
tance to filiform corrosion–Part 1: On steel
standard. The values given in parentheses are for information
only. ISO 4623–2 Paints and Varnishes—Determination of resis-
tance to filiform corrosion–Part 2: On aluminum
1.4 This standard does not purport to address all of the
ISO 4628–10 Paints and Varnishes—Evaluation of degrada-
safety problems, if any, associated with its use. It is the
tion of coatings—Designation of quantity and size of
responsibility of the user of this standard to establish appro-
defectsandofintensityofchanges–Part10:Assessmentof
priate safety and health practices and determine the applica-
filiform corrosion
bility of regulatory limitations prior to use.
NOTE 1—Procedure B of this standard is equivalent to ISO 4623. 3. Terminology
3.1 Definitions:
2. Referenced Documents
3.1.1 filiform corrosion, n—a special type of corrosion that
2
2.1 ASTM Standards:
occurs under coatings on metal substrates that is characterized
B117 Practice for Operating Salt Spray (Fog) Apparatus
by a definite threadlike structure and directional growth.
D609 Practice for Preparation of Cold-Rolled Steel Panels
3.1.1.1 Discussion—Filiform corrosion usually occurs be-
for Testing Paint, Varnish, Conversion Coatings, and
tween 20 and 35°C (70 and 95°F), with a corresponding
Related Coating Products
relative humidity range of 60 to 95 %; above 95 % humidity,
D823 Practices for Producing Films of Uniform Thickness
blistering rather than filiform corrosion may occur.
of Paint, Varnish, and Related Products on Test Panels
4. Summary of Method
D1005 Test Method for Measurement of Dry-Film Thick-
ness of Organic Coatings Using Micrometers
4.1 Coated metal specimens are scribed and placed in a
D1654 Test Method for Evaluation of Painted or Coated
corrosive atmosphere to initiate corrosion. The specimens are
Specimens Subjected to Corrosive Environments
then exposed to controlled temperature and humidity condi-
D1730 Practices for Preparation of Aluminum and
tions known to be conducive to filiform corrosion.
4.2 In Procedure A, panels are subjected to a preliminary
1
exposure in the salt spray cabinet to initiate corrosion, rinsed,
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
andplacedinahumiditycabinet.InProcedureB,basedonISO
Subcommittee D01.27 on Accelerated Testing.
4623, panels are either exposed to salt spray or dipped in a salt
Current edition approved Aug. 1, 2009. Published September 2009. Originally
solution but not rinsed before placing in the humidity cabinet
approved in 1969. Last previous addition approved in 2003 as D2803 - 03. DOI:
10.1520/D2803-09. operated at a higher temperature than in Procedure A. In
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
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*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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D2803 − 09
Procedure C, specimens are exposed as in Procedure A except 9. Procedure A
the humidity cabinet is operated at a higher temperature.
9.1 Expose the test sp
...
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:D2803–03 Designation:D2803–09
Standard Guide for Testing
Filiform Corrosion Resistance of Organic Coatings on
1
Metal
This standard is issued under the fixed designation D 2803; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope*
1.1 This guide covers three procedures for determining the susceptibility of organic-coated metal substrates to formation of
filiform corrosion.
1.2 Thisguideislimitedtothedeterminationofwhetherfiliformcorrosionwilloccurbetweentheorganiccoatingandsubstrate.
1.3 The values stated in SI units 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 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.
NOTE 1—Procedure B of this standard is equivalent to ISO 4623.
2. Referenced Documents
2
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Testing Apparatus
D 609 Practice for Preparation of Cold-Rolled Steel Panels Forfor Testing Paint, Varnish, Conversion Coatings, and Related
Coating Products
D 823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D 1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers D1186Test Methods for
Nondestructive
Measurement of
Dry Film Thick-
ness of Nonmag-
netic Coatings Ap-
plied to a Ferrous
Base
D1400Test Method for Nondestructive Measurement of Dry Film Thickness of Nonconductive Coatings Applied to a
Nonferrous Metal Base
D 1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
D 1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
D 7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic CoatingsApplied to Ferrous Metals
and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
E 104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
3
2.2 International Standard:
ISO 4623–1 Paints and Varnishes—Determination of resistance to filiform corrosion–Part 1: On steel
ISO 4623–2 Paints and Varnishes—Determination of resistance to filiform corrosion–Part 2: On aluminum
ISO 4628–10 Paints and Varnishes—Evaluation of degradation of coatings–—Designation of quantity and size of defects and
1
ThisguideisunderthejurisdictionofASTMCommitteeD01onPaintandRelatedCoatings,Materials,andApplicationsandisthedirectresponsibilityofSubcommittee
D01.27 on Accelerated Testing.
Current edition approved Dec. 1, 2003. Published December 2003. Originally approved as D2803–69T. Withdrawn June 2002 and reinstated as D2803–03.
Current edition approved Aug. 1, 2009. Published September 2009. Originally approved in 1969. Last previous addition approved in 2003 as D 2803 - 03.
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.
3
Available from American National Standards Institute, 11 W. 42nd St., 13th Floor, New York, NY 10036.
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
*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
---------------------- Page: 1 ----------------------
D2803–09
of intensity of changes–Part 10: Assessment of filiform corrosion
3. Terminology
3.1 Definitions:
3.1.1 filiform corrosionfiliform corrosion, n—a special type of corrosion that occurs under coatings on metal substrates that is
characterized by a definite threadlike structure and directional growth.
3.1.1.1 Discussion—Filiform corrosion usually occurs between 20 and 35°C (70 and 95°F), with a corresponding relative
humidity range of 60 to 95 %; above 95 % humidity, blistering rather than filiform corrosion may occur
...
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