This document specifies two methods to assess the quality of sealed anodic oxidation coatings on aluminium and its alloys:


—     Method 1 which assesses the quality of sealed anodic oxidation coatings by measuring the loss of mass after immersion in a phosphoric acid based solution without prior acid treatment;


—     Method 2 which assesses the quality of sealed anodic oxidation coatings by measuring the loss of mass after immersion in a phosphoric acid based solution with prior acid treatment.


Method 1 is applicable to anodic oxidation coatings intended for decorative or protective purposes or where resistance to staining is important.


Method 2 is applicable to anodic oxidation coatings intended for outdoor architectural purposes. For less severe applications, Method 1 can be more suitable.


The methods are not applicable to the following:


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