SR EN ISO 3210:2025

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: —     hard-type anodic oxidation coatings which normally are not sealed; —     anodic oxidation coatings that have been sealed only in dichromate solutions; —     anodic oxidation coatings produced in chromic acid solutions; —     anodic oxidation