ISO 11474 pdf download

ISO 11474 pdf download.Corrosion of metals and alloys — Corrosion tests in artificial atmosphere — Accelerated outdoor test by intermittent spraying of a salt solution (Scab test) 1 Scope The purpose of this International Standard is to define a method of assessing the corrosion resistance of metals by an accelerated outdoor corrosion test. In this International Standard, the term “metal” includes metallic materials with or without corrosion protection. The accelerated outdoor corrosion test applies to — organic coatings on metals; — metallic coatings (anodic and cathodic); — chemical conversion coatings; — metals and their alloys. The method is especially suitable for comparative testing in the optimization of surface treatment systems. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 281 0:— 1 ) , Paints and varnishes — Notes for guidance on the conduct of natural weathering tests. ISO 8407:1 991 , Corrosion of metals and alloys — Removal of corrosion products from corrosion test specimens . ISO 8565:1 992, Metals and alloys — Atmospheric corrosion testing — General requirements for field tests . ISO 9226:1 992, Corrosion of metals and alloys — Corrosivity of atmospheres — Determination of corrosion rate of standard specimens for the evaluation of corrosivity. 3 Reagents Salt solution, prepared by dissolving a sufficient mass of sodium chloride in distilled or deionized water to a concentration of 30 g/l ± 1 g/l. The distilled or deionized water used shall have a conductivity not higher than 2 mS/m at 25 °C ± 2 °C. The maximum permissible amounts of impurities in the sodium chloride are given in table 1 . Prior to use, check the pH of the salt solution by using electrometric measurement at 25 °C ± 2 °C or in routine checks, with a short range pH paper which can be read in increments of 0,3 pH units or less. If the pH value determined is outside the range 6,0 to 7,0 adjustments are to be made by adding to the alt solution diluted hydrochloric acid or sodium hydroxide...