ISO 13805 pdf download.Vitreous and porcelain enamels for aluminium — Determination of the adhesion of enamels on aluminium under the action of electrolytic solution
1 Scope
This International Standard specifies a test method for the accelerated determination of the resistance of porcelain enamel coatings on aluminium and aluminium alloys to spalling as a result of exposure to moisture or weathering. Because spalling is caused by the lack of adhesion between the coating and the base metal, the spall test is a test of adhesion. The greater the extent of spalling in this test, the greater the likelihood that the article will spall in service.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative document indicated below. For undated references, the latest edition of normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. IS0 381 9, Laboratory glassware — Beakers . ISO 4788, Laboratory glassware — Graduated measuring cylinders. ISO 1 01 41 , Vitreous and porcelain enamels — Vocabulary. ISO 1 3805, Vitreous and porcelain enamels on aluminium — Production of specimens for testing.
3 Terms and definitions
For the purposes of this International Standard, the terms and definitions given in ISO 1 01 41 apply.
4 Principle
A scored enamelled aluminium specimen is exposed to an aqueous test solution consisting of antimony trichloride, SbCl 3 , having a concentration of 1 0 g/I, at an ambient temperature of 1 8 O C to 28 O C for 20 h.
5 Designation
The test method for the determination of the adhesion of enamel coatings on aluminium and aluminium alloys by means of the spall test described in this International Standard shall be designated as follows:
6 Apparatus
6.1 Balance. 6.2 Graduate measuring cylinder, with a capacity of 1 000 ml in accordance with ISO 4788. 6.3 Beaker, in accordance with ISO 381 9 or plastic vessel of suitable size. 6.4 Plastic or glass hook, or stand, for holding the specimen in the test solution. 6.5 Viscose sponge. 6.6 File. 6.7 Steel needle.
7 Reagents
7.1 Test solution The test solution shall be an aqueous solution of technical grade antimony trichloride, SbCl 3 , with a concentration of 1 0 g/l. Prepare the test solution by dissolving 1 0 g of antimony trichloride, SbCl 3 , in 1 000 ml of distilled or demineralized water and stir continuously. NOTE Hydrochloric acid and a white precipitate consisting of a mixture of antimonious oxychloride, SbOCl, and antimony trioxide, Sb 2 O 3 , will be formed. The precipitate is an integral part of the test solution. Antimony trichloride is hygroscopic. Therefore keep it in sealed containers. Do not use moist or wet antimony trichloride. Prepare a fresh solution for each test on the same day as it is to be used. 7.2 Cleaning solution The cleaning solution shall be a sodium n -alkyl (C 1 0 -C 1 3 ) benzene sulphonate with a concentration of active substance of 0,1 % dissolved in distilled or demineralized water.
8 Specimen
8.1 Selection The specimen may be a commercially available article or a part of it. Alternatively, it may be a specially prepared specimen in accordance with ISO 1 3804. 8.2 Preparation Prepare at least one cut edge of the specimen immediately prior to the test. The angle between the cut edge and the surface of the specimen shall be approximately 90 O . If required, refinish the cut edge with a file (6.6) where the filing direction shall be from enamel to metal. Wet the cut edge completely with the test solution (7.1 ) along its whole length. Score a cross along the whole specimen surface using the steel needle (6.7) such that it extends to the base metal.