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ISO 8994:1989 Anodized aluminium and aluminium alloys - Rating system for the evaluation of pitting corrosion - Grid method
standard by International Organization for Standardization, 04/01/1989
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Defines levels of performance of anodic oxide coatings that have been subjected to corrosion tests. The rating system is applicable to pitting corrosion of the basis metal resulting from accelerated tests, exposure to corrosive environments and practical service tests. It is frequently used for rating the results of short term corrosion tests on relatively thin anodic coatings such as those used in the automotive industry.