ASTM D6675-01(2011)
(Practice)Standard Practice for Salt-Accelerated Outdoor Cosmetic Corrosion Testing of Organic Coatings on Automotive Sheet Steel
Standard Practice for Salt-Accelerated Outdoor Cosmetic Corrosion Testing of Organic Coatings on Automotive Sheet Steel
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.
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.
General Information
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Standards Content (Sample)
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Designation: D6675 − 01 (Reapproved2011)
Standard Practice for
Salt-Accelerated Outdoor Cosmetic Corrosion Testing of
Organic Coatings on Automotive Sheet Steel
This standard is issued under the fixed designation D6675; 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.
INTRODUCTION
Corrosion of painted sheet steel of auto bodies is classified according to the initial location and
direction of the corrosive attack. When the corrosion starts on the visible exterior surface, mostly at
nicks and scratches in the paint, it is called “cosmetic” or “outside in” corrosion. Corrosion initiated
at an interior surface or within a closed or semi-closed part is called “perforation” or “inside out”
corrosion.
1. Scope Related Coating Products
D610 Practice for Evaluating Degree of Rusting on Painted
1.1 This practice is designed to assist procedures to be
Steel Surfaces
followed when conducting outdoor exposures to evaluate
D823 Practices for Producing Films of Uniform Thickness
cosmetic corrosion that might occur in steel panels covered
of Paint, Varnish, and Related Products on Test Panels
with an organic coating that has been damaged. The outdoor
D1014 Practice for Conducting Exterior Exposure Tests of
exposures described are based on Practice G7 and include
Paints and Coatings on Metal Substrates
periodic wetting of the test specimens with a salt solution.
D1654 Test Method for Evaluation of Painted or Coated
1.2 The methods of preparing test specimens and the par-
Specimens Subjected to Corrosive Environments
ticular exposure requirements of materials are beyond the
D1730 Practices for Preparation of Aluminum and
scope of this practice.
Aluminum-Alloy Surfaces for Painting
D2201 Practice for Preparation of Zinc-Coated and Zinc-
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information Alloy-Coated Steel Panels for Testing Paint and Related
Coating Products
only.
D3170 Test Method for Chipping Resistance of Coatings
1.4 This standard does not purport to address all of the
G7 Practice for Atmospheric Environmental Exposure Test-
safety concerns, if any, associated with its use. It is the
ing of Nonmetallic Materials
responsibility of the user of this standard to establish appro-
G50 Practice for Conducting Atmospheric Corrosion Tests
priate safety and health practices and determine the applica-
on Metals
bility of regulatory limitations prior to use.
G117 Guide for Calculating and Reporting Measures of
2. Referenced Documents Precision Using Data from Interlaboratory Wear or Ero-
2 sion Tests
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Apparatus
3. Significance and Use
D609 Practice for Preparation of Cold-Rolled Steel Panels
3.1 Tests of the type described in this practice may be used
for Testing Paint, Varnish, Conversion Coatings, and
to evaluate the corrosion resistance of organic coatings on
metal products exposed to highly salty environments, such as
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
areas subjected to deicing salts or coastal areas. Exposure
Related Coatings, Materials, and Applications and is the direct responsibility of
conditions are complex and changeable. Important factors
Subcommittee D01.27 on Accelerated Testing.
include climate, time of year, presence of pollution, and so
Current edition approved Nov. 1, 2011. Published November 2011. Originally
forth. Generally it is difficult, if not impossible, to define or
approved in 2001. Last previous edition approved in 2006 as D6675 - 01 (2006).
DOI: 10.1520/D6675-01R11.
measure precisely all the factors that influence degradation.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Repeated exposure testing during different seasons and over a
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
period of at least two years is required to obtain results
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. representative of any given location.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6675 − 01 (2011)
3.2 Control specimens must always be used because this is 7.3 The application of electrolyte solution should be per-
a comparative test. formed on the scheduled day regardless of the weather condi-
tionssuchasrainorsnow.Unlessotherwiseagreedupon,spray
4. Test Site
the panels after the evaporation of the morning dew formation.
Do not remove snow and ice from the specimens prior to the
4.1 Location—The preferred location for the racks is a
cleared, grass covered area. Other conditions can be agreed electrolyte solution application.
upon between the parties involved.
8. Periods of Exposure
4.2 Rack Position and Type—45° open rack facing the
8.1 The duration of exposure should be specified on one of
equator, direct weathering unless other conditions are agreed
the following bases:
upon between the buyer and seller.
8.1.1 Exposure for a specified number of days, mo
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