NF EN ISO 11997-3, X41-004-3 (10/2023)

This document specifies a method based on a cyclic corrosion test for evaluating the corrosion protection provided by coating systems applied to aluminum, steel or galvanized steel in the automotive industry. The corrosion conditions (temperature and humidity ramps and salt spray) implemented in the test method are intended to obtain realistic corrosion models. These corrosion patterns are characteristic of the automotive industry and can be compared to each other when the protective coating systems are sufficiently similar. In particular, the accelerated test studies delamination/creep due to corrosion resulting from determined artificial damage to a coating. Surface corrosion and edge corrosion are also studied, as well as adhesive specimens or parts. This cyclic corrosion test is also suitable for assessing corrosion in areas with flanges or near air gaps. This document has been developed for the evaluation of coated substrates (test specimens, bodywork and fitted parts) in the automotive industry. Other applications (e.g. those using parts with unpainted metal coatings) are outside the scope of standardization work. This document was originally developed for coating systems on aluminum, steel or galvanized steel; however, it can also be used to evaluate the corrosion resistance of coating systems on other metals and their alloys.
(Automatic translation from French)