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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.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B117 Practice for Operating Salt Spray (Fog) Apparatus
D609 Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products
D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
D1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
E104 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions
International StandardISO4628–10 Paints and VarnishesEvaluation of degradation of coatingsDesignation of quantity and size of defects and of intensity of changesPart 10: Assessment of filiform corrosion
ICS Number Code 25.220.60 (Organic coatings)
UNSPSC Code 46181533(Protective coats)
ASTM D2803-09, Standard Guide for Testing Filiform Corrosion Resistance of Organic Coatings on Metal, ASTM International, West Conshohocken, PA, 2009, www.astm.orgBack to Top