ASTM B368-09(2014)
(Test Method)Standard Test Method for Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing (CASS Test)
Standard Test Method for Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing (CASS Test)
SIGNIFICANCE AND USE
3.1 The CASS test is widely employed and is useful for specification acceptance, simulated service evaluation, manufacturing control, and research and development. It was developed specifically for use with decorative, electrodeposited nickel/chromium and copper/nickel/chromium coatings. Use of the test has improved the quality of electroplated parts and led to the development of new and superior electroplating processes.
SCOPE
1.1 This test method prescribes the conditions required in copper-accelerated acetic acid-salt spray (CASS) testing for specification purposes. The standard does not specify the type of test specimen or exposure periods to be used for a specific product, nor the interpretation to be given to the results.
1.2 This test method is applicable to evaluating the corrosive performance of decorative copper/nickel/chromium or nickel/chromium coatings on steel, zinc alloys, aluminum alloys, and plastics designed for severe service. It is also applicable to the testing of anodized aluminum. The suitability of this test and correlation of results with service experience should be determined before it is specified for coating systems or materials other than those mentioned in this paragraph. Note 1—The following standards are not requirements. They are referenced for information only: Practices B537 and E50, Specifications B456 and B604, and Test Method B602.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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. For more specific safety precautionary information see 8.1.
General Information
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B368 − 09 (Reapproved 2014)
Standard Test Method for
Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing
1
(CASS Test)
This standard is issued under the fixed designation B368; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope B162 Specification for Nickel Plate, Sheet, and Strip
B456 Specification for Electrodeposited Coatings of Copper
1.1 This test method prescribes the conditions required in
Plus Nickel Plus Chromium and Nickel Plus Chromium
copper-accelerated acetic acid-salt spray (CASS) testing for
B537 Practice for Rating of Electroplated Panels Subjected
specification purposes. The standard does not specify the type
to Atmospheric Exposure
of test specimen or exposure periods to be used for a specific
B602 Test Method for Attribute Sampling of Metallic and
product, nor the interpretation to be given to the results.
Inorganic Coatings
1.2 This test method is applicable to evaluating the corro-
B604 Specification for Decorative Electroplated Coatings of
sive performance of decorative copper/nickel/chromium or
Copper Plus Nickel Plus Chromium on Plastics
nickel/chromium coatings on steel, zinc alloys, aluminum
D1193 Specification for Reagent Water
alloys, and plastics designed for severe service. It is also
E50 Practices for Apparatus, Reagents, and Safety Consid-
applicable to the testing of anodized aluminum. The suitability
erations for Chemical Analysis of Metals, Ores, and
of this test and correlation of results with service experience
Related Materials
should be determined before it is specified for coating systems
E70 Test Method for pH of Aqueous Solutions With the
or materials other than those mentioned in this paragraph.
Glass Electrode
NOTE 1—The following standards are not requirements. They are
3. Significance and Use
referenced for information only: Practices B537 and E50, Specifications
B456 and B604, and Test Method B602.
3.1 The CASS test is widely employed and is useful for
1.3 The values stated in SI units are to be regarded as specification acceptance, simulated service evaluation, manu-
standard. No other units of measurement are included in this
facturing control, and research and development. It was devel-
standard. oped specifically for use with decorative, electrodeposited
nickel/chromiumandcopper/nickel/chromiumcoatings.Useof
1.4 This standard does not purport to address all of the
the test has improved the quality of electroplated parts and led
safety concerns, if any, associated with its use. It is the
to the development of new and superior electroplating pro-
responsibility of the user of this standard to establish appro-
cesses.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For more specific
4. Apparatus
safety precautionary information see 8.1.
4.1 The apparatus required for the CASS test consists of a
2. Referenced Documents
fog chamber, a salt-solution reservoir, a supply of compressed
2
air, one or more atomizing nozzles, specimen supports, provi-
2.1 ASTM Standards:
sion for heating the chamber, and necessary means of control.
B117 Practice for Operating Salt Spray (Fog) Apparatus
4.2 The size and detailed construction of the apparatus are
1
This test method is under the jurisdiction ofASTM Committee B08 on Metallic
optional, provided the conditions meet the requirements of this
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.10 on
test method. The construction of the apparatus is described in
Test Methods.
the appendix of Test Method B117. For the CASS test,
Current edition approved May 1, 2014. Published May 2014. Originally
approved in 1961. Last previous edition approved in 2009 as B368 – 09. DOI:
however, the requirements for air pressure and temperature are
10.1520/B0368-09R14.
typically 0.08 to 0.12 MPa and 60 to 65°C, respectively. The
The CASS test was developed by the initiative of the Research Board of the
actual air pressure will be that required to produce the proper
American Electroplaters Society under AES Project 15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or collection rate (see 8.3.1).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.3 The apparatus shall be constructed so that drops of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. solution that accumulate on the ceiling or cover of the chamber
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