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ASTM D2803-09(2020)

(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
5.1 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.  
5.2 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.
Note 1: Procedure B of this standard is equivalent to ISO 4623.  
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.

General Information

Status
Published
Publication Date
31-May-2020
ICS
25.220.60 - Organic coatings
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.27 - Accelerated Testing
Current Stage
Ref Project

Relations

Refers
ASTM D1730-09(2020) - Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
Effective Date
01-May-2020
Refers
ASTM D1005-95(2020) - Standard Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
Effective Date
01-Jun-2020
Referred By
ASTM D3322-23 - Standard Practice for Testing Primers and Primer Surfacers Over Preformed Metal
Effective Date
01-Jun-2020
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-Jun-2020

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ASTM D2803-09(2020) - Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on MetalASTM D2803-09(2020) - Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal
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ASTM D2803-09(2020) - Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal
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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: D2803 − 09 (Reapproved 2020)
Standard Guide 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 U.S. Department of Defense.
1. Scope D1005 Test Method for Measurement of Dry-Film Thick-
ness of Organic Coatings Using Micrometers
1.1 This guide covers three procedures for determining the
D1654 Test Method for Evaluation of Painted or Coated
susceptibility of organic-coated metal substrates to formation
Specimens Subjected to Corrosive Environments
of filiform corrosion.
D1730 Practices for Preparation of Aluminum and
1.2 This guide is limited to the determination of whether
Aluminum-Alloy Surfaces for Painting
filiform corrosion will occur between the organic coating and
D7091 Practice for Nondestructive Measurement of Dry
substrate.
Film Thickness of Nonmagnetic Coatings Applied to
1.3 The values stated in SI units are to be regarded as the Ferrous Metals and Nonmagnetic, Nonconductive Coat-
ings Applied to Non-Ferrous Metals
standard. The values given in parentheses are for information
only. E104 Practice for Maintaining Constant Relative Humidity
NOTE 1—Procedure B of this standard is equivalent to ISO 4623. by Means of Aqueous Solutions
3
1.4 This standard does not purport to address all of the
2.2 International Standard:
safety concerns, if any, associated with its use. It is the
ISO 4623–1 Paints and Varnishes—Determination of resis-
responsibility of the user of this standard to establish appro-
tance to filiform corrosion–Part 1: On steel
priate safety, health, and environmental practices and deter-
ISO 4623–2 Paints and Varnishes—Determination of resis-
mine the applicability of regulatory limitations prior to use.
tance to filiform corrosion–Part 2: On aluminum
1.5 This international standard was developed in accor-
ISO 4628–10 Paints and Varnishes—Evaluation of degrada-
dance with internationally recognized principles on standard-
tion of coatings—Designation of quantity and size of
ization established in the Decision on Principles for the
defectsandofintensityofchanges–Part10:Assessmentof
Development of International Standards, Guides and Recom-
filiform corrosion
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. 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, Coatings and Related Products on Test Panels
4. Summary of Method
1
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
4.1 Coated metal specimens are scribed and placed in a
Related Coatings, Materials, and Applications and is the direct responsibility of
corrosive atmosphere to initiate corrosion. The specimens are
Subcommittee D01.27 on Accelerated Testing.
then exposed to controlled temperature and humidity condi-
CurrenteditionapprovedJune1,2020.PublishedJuly2020.Originallyapproved
in 1969. Last previous addition approved in 2015 as D2803 – 09 (2015). DOI:
tions known to be conducive to filiform corrosion.
10.1520/D2803-09R20.
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 from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D2803 − 09 (2020)
4.2 In Procedure A, panels are subjected to a prelimina
...

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4.1 Coatings attached to substrates are elongated when the substrates are dimensionally unstable, or are bent during the manufacture of articles or when the articles are abused in service. These test methods have been useful in rating attached coatings for their ability to resist cracking when elongated. They have been useful in evaluating the flexibility of coatings on flexible substrates. The elongation of coating films may also be tested using Test Method D2370. The correlation between elongation determined in accordance with Test Methods D522/D522M and D2370 is unknown.
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5.1 Tensile properties determined by this method are of value in studying the behavior of coatings subjected to environmental stresses, such as those produced by aging and weathering. (See Refs. (1-10).)4  
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1.1 This test method covers the determination of the elongation, tensile strength, and stiffness (modulus of elasticity) of organic coatings when tested as free films.  
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