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RS ISO 9227: 2022/Amd.1:2024
Corrosion tests in artificial atmospheres — Salt spray tests

Abstract

1 Scope
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 NSS test is particularly applicable to:
— metals and their alloys;
— metallic coatings (anodic and cathodic);
— conversion coatings;
— anodic oxide coatings;
— organic coatings on metallic materials.
The 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 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.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 9227: 2022/Amd.1:2024	ADOPTED ISO STANDARDS	Chemical technology	37	Fifth Edition Jul 2026	Available