ISO 9227:2012, “Corrosion tests in artificial atmospheres — Salt spray tests,” has just been released and is now available from Document Center Inc. in either paper or pdf format. 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.
ISO 9227 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.
Salt spray tests are generally suitable as corrosion protection tests for rapid analysis for discontinuities, pores and damage in organic and inorganic coatings. In addition, for quality control purposes, comparison can be made between specimens coated with the same coating. As comparative tests, however, salt spray tests are only suitable if the coatings are sufficiently similar in nature.
This 25-page third edition is a minor revision of the second edition (ISO 9227:2006), which is now obsolete. ISO 9227 also replaced the cancelled ISO 3768, “Metallic coatings — Neutral salt spray test (NSS test),” in December, 1990.
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