BS EN ISO 3210:2017 pdf download

BS EN ISO 3210:2017 pdf download.Anodizing of aluminium and its alloys — Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in acid solution(s)
1 Scope
This document specifies methods of assessing the quality of sealed anodic oxidation coatings on aluminium and its alloys by measurement of the loss of mass after immersion in acid solution(s).
It consists of the following two methods.
— Method 1: Assessment of quality of sealed anodic oxidation coatings by measurement of the loss of mass after immersion in a phosphoric acid based solution without prior acid treatment.
— Method 2: Assessment of quality of sealed anodic oxidation coatings by measurement of 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 coatings that have undergone treatment to render them hydrophobic.
NOTE 1 The methods assess the quality of hydrothermal sealing applied to anodized aluminium. They can be appropriate for other sealing methods.
NOTE 2 The methods are destructive and can serve as reference methods in case of doubt or dispute regarding the results of the test for loss of absorptive power (see ISO 2143) or the measurement of admittance (see ISO 2931).
In special cases, such as certain types of jigging, small hollow sections, etc., it is necessary to remove the anodic oxidation coating from the inside surface and to carry out the test on the coating on the outer surface of the extrusion. If test solution A is used, the anodic oxidation coating may be removed from the inside by mechanical abrasion or by chemical dissolution. Otherwise, the inside surface may be masked. If by agreement between the anodizer and the customer, special test specimens are prepared, they shall be of the same alloy as the production components and processed through the anodizing line at the same time as the production components.
8 Procedure
8.1 Test solutions
Test solution A does not attack bare metal and it is not necessary to take uncoated surfaces into account.
Test solution B attacks bare metal to a limited extent. However, it is not necessary to take uncoated surfaces into account if conditions a) and b) are both satisfied.
a) Dissolution of an uncoated specimen of the metal does not exceed 10 mg/dm 2 over the operations 8.2.4 to 8.2.6 or 8.3.4 to 8.3.8 inclusive depending on the method being used.
b) The uncoated surface area does not exceed 20 % of the total surface area if the uncoated surface was created by cutting or mechanical abrasion to remove the anodic oxidation coating or by chemical dissolution of the anodic oxidation coating.