BS EN ISO 2085-2018 pdf free download.Anodizing of aluminium and its alloys – Check for continuity of thin anodic oxidation coatings – Copper sulfate test
This document specifies a method for checking the continuity of thin anodic oxidation coatings on aluminium and its alloys by a copper sulfate contact test.
The use of this method is limited to anodic oxidation coatings of thickness less than 5 µm or coatings that have been deformed, which includes those produced by coil anodizing techniques.
NOTE The method described enables a rapid check to be made for the continuity of a thin coating of aluminium oxidation on aluminium and its alloys. In cases of doubt regarding a visible fault on the surface of a coating, the use of this method makes it possible to verify whether the fault corresponds to a local gap in the coating that exposes bare metal.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7583, Anodizing of aluminium and its alloys — Terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7583 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
Drops of copper sulfate reagent are placed on surface areas of about 100 mm 2 , chosen at will on the test specimens and avoiding the anodizing contact areas. If the area includes points where the metal is either bare or poorly covered, chemical deposition of copper takes place on the aluminium, accompanied by a release of gas. The drops of applied reagent can be examined immediately upon application, either with the naked eye or with a magnifying glass, for the release of gas from points where the metal is bare,which is almost instantaneous. After the test, black and/or dark reddish spots can be seen where the coating is not continuous.
5 Reagents
5.1 Copper sulfate solution, prepared as follows:
— copper(II) sulfate pentahydrate, (CuSO 4 ⋅5H 2 O): 20 g;
6 Test area
6.1 Sampling
The test area shall be within a significant surface of the product and shall not include the edges.
The test area shall be selected so that it can be held horizontally during the test unless it is to be immersed in the test solution (in accordance with Clause 7, NOTE 2).
6.2 Size and shape
The standard size of the test area should be 100 mm 2 . The test area should be flat.
6.3 Treatment before testing
The test area shall be clean, free from dirt, stains and other foreign matters. Any deposits or stains shall be removed with a clean, soft cloth or similar material which is wetted by water or an appropriate organic solvent such as ethanol. Organic solvents which can corrode the test area or generate a protective film on the test area shall not be used.
7 Procedure
Carry out the test at room temperature.
Mark out a test area of approximately 100 mm 2 on a horizontal part of the test specimen using a wax crayon or rapidly drying organic paint material to delineate the test area leaving the test area itself unmasked.
Cover the test area with the reagent (5.1) using approximately four drops. Leave the reagent in contact with the surface for 5 min, noting any release of gas, and then rinse the area with clean water. Examine the surface and count the number of black and/or dark reddish spots and/or lines per 100 mm 2 .
NOTE 1 For a more quantitative measurement, the average diameter (mm) of the black and/or dark reddish spots or the average length (mm) of the black and/or dark reddish lines is also estimated.
NOTE 2 Where a flat test area is not obtained from the product, the test is carried out by immersing the product in the copper sulfate solution. In this case, the surface of the product other than the test area, such as the edges, back surface, etc. of the product, is masked before the test for the purpose of delineating the test area.
8 Expression of results
Record the number of black and/or dark reddish spots and/or lines per 100 mm 2 for each area examined and, if appropriate, their average diameter and/or the length.
9 Test report
The test report shall include at least the following information:
a) a reference to this document, i.e. ISO 2085:2018;
b) the type and identification of the product tested;
c) the results of the test (see Clause 8);BS EN ISO 2085 pdf download.