BS EN ISO 8993:2018

What is ISO 8993-Anodizing of aluminium and its alloys about? 

ISO 8993 is an international standard that discusses anodizing of aluminium and its alloys. ISO 8993 specifies a chart rating system based on standard charts that provides a means of defining levels of performance of anodic oxidation coatings on aluminium and its alloys that have been subjected to corrosion tests. This rating system is applicable to pitting corrosion resulting from: 

• Accelerated tests 
• Exposure to corrosive environments 
• Practical service tests 

ISO 8993 takes into account only pitting corrosion resulting from penetration of the protective anodic oxidation coating. 

Who is ISO 8993-Anodizing of aluminium and its alloys for?  

ISO 8993 on the rating system for the evaluation of pitting corrosion is relevant to: 

• Manufacturers of aluminium alloys 
• Metallurgists 
• Aluminium foundries 

Why should you use ISO 8993-Anodizing of aluminium and its alloys? 

Chart rating systems simplify the task of evaluation and enhance the quality grading procedure. It also highlights the key factors the evaluators should consider before grading a specimen. ISO 8993 assists the user with the preparation of test specimens, determination of chart rating, expression of results, and test report. 

Overall, ISO 8993 is helpful as it guides the rating system for the evaluation of pitting corrosion which can help you to rate anodic oxidation coatings performance and how it enhances the resistance to corrosion of the aluminium. 

What’s changed since the last update? 

BS EN ISO 8993:2018 supersedes ISO 8993:2010, which is withdrawn. The main changes in BS EN ISO 8993:2018 compared to ISO 8993:2010 are as follows: 

• Rating numbers (RN) have been added to Table 1 and to Figures A.1 to A.8 
• A rating chart for designation A (RN 10) has been added to Figure A.1