This International Standard specifies the apparatus, the
reagents and the procedure to be used in conducting the neutral
salt spray (NSS), acetic acid salt spray (AASS) and
copper-accelerated acetic acid salt spray (CASS) tests for
assessment of the corrosion resistance of metallic materials, with
or without permanent or temporary corrosion protection.
It also describes the method employed to evaluate the
corrosivity of the test-cabinet environment.
It does not specify the dimensions of test specimens, the
exposure period to be used for a particular product, or the
interpretation of results. Such details are provided in the
appropriate product specifications.
The salt spray tests are particularly useful for detecting
discontinuities, such as pores and other defects in certain
metallic, organic, anodic oxide and conversion coatings.
The neutral salt spray test applies to:
— metals and their alloys;
— metallic coatings (anodic and cathodic);
— conversion coatings;
— anodic oxide coatings;
— organic coatings on metallic materials.
The acetic acid salt spray test is especially useful for testing
decorative coatings of copper + nickel + chromium, or nickel +
chromium. It has also been found suitable for testing anodic
coatings on aluminum.
The copper-accelerated acetic acid salt spray test is useful for
testing decorative coatings of copper + nickel + chromium, or
nickel + chromium. It has also been found suitable for testing
anodic coatings on aluminum.
The salt spray methods are all suitable for checking that the
comparative quality of a metallic material, with or without
corrosion protection, is maintained. They are not intended to be
used for comparative testing, to rank different materials relative
to each other with respect to corrosion resistance.
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