UNE-EN ISO 9227:2023

This document 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 or types 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 (NSS) test particularly applies to

metals and their alloys,

metallic coatings (anodic and cathodic),

conversion coatings,

anodic oxide coatings, and

organic coatings on metallic materials.

The acetic acid salt spray (AASS) test is especially useful for testing decorative coatings of copper +

nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic and organic

coatings on aluminium.

The copper-accelerated acetic acid salt spray (CASS) test is useful for testing decorative coatings of

copper + nickel + chromium, or nickel + chromium. It has also been found suitable for testing anodic

and organic coatings on aluminium.

The salt spray methods are all suitable for checking that the quality of a metallic material, with or

without corrosion protection, is maintained. They are not intended to be used for comparative testing

as a means of ranking different materials relative to each other with respect to corrosion resistance or

as means of predicting long-term corrosion resistance of the tested material.