The purpose of this International Standard is to define a method of assessing the corrosion resistance of metals by an accelerated outdoor corrosion test. In this International Standard, the term "metal" includes metallic materials with or without corrosion protection. The accelerated outdoor corrosion test applies to — organic coatings on metals; — metallic coatings (anodic and cathodic); — chemical conversion coatings; — metals and their alloys. The method is especially suitable for comparative testing in the optimization of surface treatment systems.