ASTM D6675-01

Standard Practice for Salt-Accelerated Outdoor Cosmetic Corrosion Testing of Organic Coatings on Automotive Sheet Steel

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 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

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 43.040.60 - Bodies and body components
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.27 - Accelerated Testing

Relations

• Replaced By: ASTM D6675-01(2006) - Standard Practice for Salt-Accelerated Outdoor Cosmetic Corrosion Testing of Organic Coatings on Automotive Sheet Steel
• Effective Date: 01-Nov-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 6675 – 01
Standard Practice for
Salt-Accelerated Outdoor Cosmetic Corrosion Testing of
Organic Coatings on Automotive Sheet Steel
This standard is issued under the fixed designation D 6675; 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 (e) 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 D 1014 PracticesforConductingExteriorExposureTestsof
Paints on Steel
1.1 This practice is designed to assist procedures to be
D 1654 PracticesforEvaluationofPaintedorCoatedSpeci-
followed when conducting outdoor exposures to evaluate
mens Subjected to Corrosive Environments
cosmetic corrosion that might occur in steel panels covered
D 1730 Practices for Preparation of Aluminum and Alumi-
with an organic coating that has been damaged. The outdoor
num Alloy Surfaces for Painting.
exposures described are based on Practice G 7 and include
D 2201 Practice for Preparation of Zinc-Coated and Zinc-
periodic wetting of the test specimens with a salt solution.
Alloy-Coated Steel Panels for Testing Paint and Related
1.2 The methods of preparing test specimens and the par-
Coating Products
ticular exposure requirements of materials are beyond the
D 3170 Test Method for Chip Resistance of Coatings
scope of this practice.
G 7 Practice for Atmospheric Environmental Exposure
1.3 This standard does not purport to address all of the
Testing of Nonmetallic Materials
safety concerns, if any, associated with its use. It is the
G 50 Practice for Conducting Atmospheric Corrosion Tests
responsibility of the user of this standard to establish appro-
on Metals
priate safety and health practices and determine the applica-
G 117 Guide for Calculating and Reporting Measures of
bility of regulatory limitations prior to use.
Precision Using Data from Interlaboratory Wear or Ero-
2. Referenced Documents
sion Tests
2.1 ASTM Standards:
3. Significance and Use
B 117 Practice for Operating Salt Spray (Fog) Apparatus
3.1 Tests of the type described in this practice may be used
D 609 Practice for Preparation of Cold-Rolled Steel Panels
to evaluate the corrosion resistance of organic coatings on
for Testing Paint, Varnish, Conversion Coatings, and
metal products exposed to highly salty environments, such as
Related Coating Products
areas subjected to deicing salts or coastal areas. Exposure
D 610 Test Method for Evaluating Degree of Rusting on
4 conditions are complex and changeable. Important factors
Painted Steel Surfaces
include climate, time of year, presence of pollution, and so
D 823 Practices for Producing Films of Uniform Thickness
3 forth. Generally it is difficult, if not impossible, to define or
of Paint, Varnish, and Related Products on Test Panels
measure precisely all the factors that influence degradation.
Repeated exposure testing during different seasons and over a
1 period of at least two years is required to obtain results
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
representative of any given location.
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.27 on Accelerated Testing.
Current edition approved May 10, 2001. Published July 2001.
2 5
Annual Book of ASTM Standards, Vol 03.02. Annual Book of ASTM Standards, Vol 02.05.
3 6
Annual Book of ASTM Standards, Vol 06.01. Annual Book of ASTM Standards, Vol 14.04.
4 7
Annual Book of ASTM Standards, Vol 06.02. Annual Book of ASTM Standards, Vol 03.02.
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D 6675
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.
4.1 Location—The preferred location for the racks is a Do not remove snow and ice from the specimens prior to the
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
equator, direct weathering unless other conditions are agreed
8.1 The duration of exposure should be specified on one of
upon between the buyer and seller.
the following bases:
8.1.1 Exposure for a specified number of days, months or
NOTE 1—Information on location, rack construction, and posit
...