ASTM D2803-03

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Designation:D2803–03
Standard Guide for Testing
Filiform Corrosion Resistance of Organic Coatings on
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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 (e) 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 D 1654 Test Method for Evaluation of Painted or Coated
Specimens Subjected to Corrosive Environments
1.1 This guide covers three procedures for determining the
D 1730 Practices for Preparation of Aluminum and
susceptibility of organic-coated metal substrates to formation
Aluminum-Alloy Surfaces for Painting
of filiform corrosion.
E 104 Practice for Maintaining Constant Relative Humidity
1.2 This guide is limited to the determination of whether
by Means of Aqueous Solutions
filiform corrosion will occur between the organic coating and
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2.2 International Standard:
substrate.
ISO 4623–1 Paints and Varnishes—Determination of resis-
1.3 The values stated in SI units are to be regarded as the
tance to filiform corrosion–Part 1: On steel
standard. The values given in parentheses are for information
ISO 4623–2 Paints and Varnishes—Determination of resis-
only.
tance to filiform corrosion–Part 2: On aluminum
1.4 This standard does not purport to address all of the
ISO 4628–10 Paints andVarnishes—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.
3. Terminology
2. Referenced Documents
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3.1 Definitions:
2.1 ASTM Standards:
3.1.1 filiform corrosion—a special type of corrosion that
B117 Practice for Operating Salt Spray (Fog) Testing
occurs under coatings on metal substrates that is characterized
Apparatus
by a definite threadlike structure and directional growth.
D 609 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,
D 823 Practices for Producing Films of Uniform Thickness
blistering rather than filiform corrosion may occur.
of Paint, Varnish, and Related Products on Test Panels
D 1005 Test Method for Measurement of Dry-Film Thick-
4. Summary of Method
ness of Organic Coatings Using Micrometers
4.1 Coated metal specimens are scribed and placed in a
D 1186 Test Methods for Nondestructive Measurement of
corrosive atmosphere to initiate corrosion. The specimens are
Dry Film Thickness of Nonmagnetic Coatings Applied to
then exposed to controlled temperature and humidity condi-
a Ferrous Base
tions known to be conducive to filiform corrosion.
D 1400 Test Method for Nondestructive Measurement of
4.2 In Procedure A, panels are subjected to a preliminary
DryFilmThicknessofNonconductiveCoatingsAppliedto
exposure in the salt spray cabinet to initiate corrosion, rinsed,
a Nonferrous Metal Base
andplacedinahumiditycabinet.InProcedureB,basedonISO
4623, panels are either exposed to salt spray or dipped in a salt
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solution but not rinsed before placing in the humidity cabinet
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of
operated at a higher temperature than in Procedure A. In
Subcommittee D01.27 on Accelerated Testing.
Procedure C, specimens are exposured as in Procedure A
Current edition approved Dec. 1, 2003. Published December 2003. Originally
exceptthehumiditycabinetisoperatedatahighertemperature.
approved as D 2803 – 69 T. Withdrawn June 2002 and reinstated as D 2803 – 03.
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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
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the ASTM website. Floor, New York, NY 10036.
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D2803–03
4.3 The procedures contained in this guide differ signifi- 9.2 Remove from the salt-fog cabinet and thoroughly rinse
cantly in method of initiation, and
...