ASTM D6675-01(2006)
(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 G 7 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.
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Standards Content (Sample)
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Designation:D6675–01(Reapproved2006)
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 D609 Practice for Preparation of Cold-Rolled Steel Panels
for Testing Paint, Varnish, Conversion Coatings, and
1.1 This practice is designed to assist procedures to be
Related Coating Products
followed when conducting outdoor exposures to evaluate
D610 Practice for Evaluating Degree of Rusting on Painted
cosmetic corrosion that might occur in steel panels covered
Steel Surfaces
with an organic coating that has been damaged. The outdoor
D823 Practices for Producing Films of Uniform Thickness
exposures described are based on Practice G7 and include
of Paint, Varnish, and Related Products on Test Panels
periodic wetting of the test specimens with a salt solution.
D1014 Practice for Conducting Exterior Exposure Tests of
1.2 The methods of preparing test specimens and the par-
Paints and Coatings on Metal Substrates
ticular exposure requirements of materials are beyond the
D1654 Test Method for Evaluation of Painted or Coated
scope of this practice.
Specimens Subjected to Corrosive Environments
1.3 The values stated in SI units are to be regarded as the
D1730 Practices for Preparation of Aluminum and
standard. The values given in parentheses are for information
Aluminum-Alloy Surfaces for Painting
only.
D2201 Practice for Preparation of Zinc-Coated and Zinc-
1.4 This standard does not purport to address all of the
Alloy-Coated Steel Panels for Testing Paint and Related
safety concerns, if any, associated with its use. It is the
Coating Products
responsibility of the user of this standard to establish appro-
D3170 Test Method for Chipping Resistance of Coatings
priate safety and health practices and determine the applica-
G7 Practice forAtmospheric Environmental Exposure Test-
bility of regulatory limitations prior to use.
ing of Nonmetallic Materials
2. Referenced Documents G50 Practice for Conducting Atmospheric Corrosion Tests
on Metals
2.1 ASTM Standards:
G117 Guide for Calculating and Reporting Measures of
B117 Practice for Operating Salt Spray (Fog) Apparatus
Precision Using Data from Interlaboratory Wear or Ero-
sion Tests
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
Related Coatings, Materials, and Applications and is the direct responsibility of 3. Significance and Use
Subcommittee D01.27 on Accelerated Testing.
3.1 Tests of the type described in this practice may be used
Current edition approved Nov. 1, 2006. Published November 2006. Originally
to evaluate the corrosion resistance of organic coatings on
approved in 2001. Last previous edition approved in 2001 as D6675 - 01. DOI:
10.1520/D6675-01R06.
metal products exposed to highly salty environments, such as
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
areas subjected to deicing salts or coastal areas. Exposure
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
conditions are complex and changeable. Important factors
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. include climate, time of year, presence of pollution, and so
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D6675–01 (2006)
forth. Generally it is difficult, if not impossible, to define or 7.3 The application of electrolyte solution should be per-
measure precisely all the factors that influence degradation. formed on the scheduled day regardless of the weather condi-
Repeated exposure testing during different seasons and over a tionssuchasrainorsnow.Unlessotherwiseagreedupon,spray
period of at least two years is required to obtain results the panels after the evaporation of the morning dew formation.
representative of any given location.
Do not remove snow and ice from the specimens prior to the
3.2 Control specimens must always be used because this is electrolyte solution application.
a comparative test.
8. Periods of Exposure
4. Test Site
8.1 The duration of exposure should be specified on one of
4.1 Location—The preferred location for the racks is a
the following bases:
cleared, grass covered area. Other conditions can be agreed
8.1.1 Exposure for a specified number of days, months or
upon between the parties involved.
years. The report shall indicate exact dates of exposure.
4.2 Rack Position and Type—45° open rack facing the
8.1.2 Exposure until a specified leve
...
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