Significance and Use

Tests of the type described in this practice may be used to evaluate the corrosion resistance of organic coatings on metal products exposed to highly salty environments, such as areas subjected to deicing salts or coastal areas. Exposure conditions are complex and changeable. Important factors include climate, time of year, presence of pollution, and so forth. Generally it is difficult, if not impossible, to define or measure precisely all the factors that influence degradation. Repeated exposure testing during different seasons and over a period of at least two years is required to obtain results representative of any given location.

Control specimens must always be used because this is a comparative test.

1. Scope

1.1 This practice is designed to assist procedures to be followed when conducting outdoor exposures to evaluate cosmetic corrosion that might occur in steel panels covered with an organic coating that has been damaged. The outdoor exposures described are based on Practice G7 and include periodic wetting of the test specimens with a salt solution.

1.2 The methods of preparing test specimens and the particular exposure requirements of materials are beyond the scope of this practice.

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 concerns, 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

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

D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces

D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels

D1014 Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates

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

D2201 Practice for Preparation of Zinc-Coated and Zinc-Alloy-Coated Steel Panels for Testing Paint and Related Coating Products

D3170 Test Method for Chipping Resistance of Coatings

G7 Practice for Atmospheric Environmental Exposure Testing of Nonmetallic Materials

G50 Practice for Conducting Atmospheric Corrosion Tests on Metals

G117 Guide for Calculating and Reporting Measures of Precision Using Data from Interlaboratory Wear or Erosion Tests

Keywords

atmospheric testing; corrosion; exposure tests-exterior: Accelerated aging/testing--paints/related coatings; Automotive coatings/paints; Cosmetic corrosion testing; Organic coatings; Outdoor cosmetic corrosion testing; Salt-accelerated outdoor corrosion testing; Steel sheet;

ICS Code

ICS Number Code 43.040.60 (Bodies and body components)

DOI: 10.1520/D6675-01R11

ASTM International is a member of CrossRef.

ASTM D6675