ASTM D6675-01(2015)

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

SIGNIFICANCE AND USE
3.1 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.  
3.2 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

• Status: Historical
• Publication Date: 30-Nov-2015
• ICS: 43.040.60 - Bodies and body components
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.27 - Accelerated Testing

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D6675 − 01 (Reapproved 2015)
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
1.3 The values stated in SI units are to be regarded as the D2201 Practice for Preparation of Zinc-Coated and Zinc-
Alloy-Coated Steel Panels for Testing Paint and Related
standard. The values given in parentheses are for information
only. Coating Products
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
Precision Using Data from Interlaboratory Wear or Ero-
2. Referenced Documents
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 Dec. 1, 2015. Published December 2015. Originally
forth. Generally it is difficult, if not impossible, to define or
approved in 2001. Last previous edition approved in 2011 as D6675 – 01 (2011).
DOI: 10.1520/D6675-01R15.
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 [e-mail]. 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 (2015)
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-
tions such as rain or snow. Unless otherwise agreed upon, 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
electrolyte solution application.
cleared, grass covered area. Other conditions can be agreed
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, months or
NOTE 1—Information on location, rack constr
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6675 − 01 (Reapproved 2011) D6675 − 01 (Reapproved 2015)
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
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
2.1 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
This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.27 on Accelerated Testing.
Current edition approved Nov. 1, 2011Dec. 1, 2015. Published November 2011December 2015. Originally approved in 2001. Last previous edition approved in 20062011
as D6675 - 01 (2006).D6675 – 01 (2011). DOI: 10.1520/D6675-01R11.10.1520/D6675-01R15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6675 − 01 (2015)
3. Significance and Use
3.1 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.
3.2 Control specimens must always be used because this is a comparative test.
4. Test Site
4.1 Location—The preferred location for the racks is a cleared, grass covered area. Other conditions can be agreed upon between
the parties involved.
4.2 Rack Position and Type—45° open rack facing the equator, direct weathering unless other conditions are agreed upon
between the buyer and seller.
NOTE 1—Information on location, rack construction, and position are given in Practices D1014, G7, and G50.
5. Test Specimens
5.1 Methods for the preparation of test panels and substrates are given in Practices D609, D1730 and D2201. Practice D823
covers techniques for producing uniformly coated test panels.
6. Preparation of Test Specimens
6.1 Pri
...