BS ISO 22479:2019 pdf free.Corrosion of metals and alloys – Sulfur dioxide test in a humid atmosphere (fixed gas method).
The source of sulfur dioxide should be a gas cylinder with a volume concentration of more than 99,9 %. It shall be fitted with appropriate regulating and measuring apparatus to ensure the supply of the correct volume of gas. The volume of gas delivered into the test cabinet should be measured by a calibrated
flow meter. Another measuring instrument works with squeezing out a viscous liquid paraffin for the volume of the gas for 0,2, 1,0 and 2,0 I. WARNING一Sulfur dioxide (CAS no. 7446-09-5) is toxic, corrosive and irritating. Handling of sulfur dioxide shall be restricted to skilled personnel or conducted under their control. The apparatus shall be used and maintained by skilled personnel, not only so that the procedures can be performed correctly, but also because of the hazards to health and safety that are involved. 5.4 Conditioning of a new cabinet. In order to minimize the effect from the material of the cabinet by sulfur dioxide, a new cabinet shall be operated at least one test cycle in accordance with the procedures given in 8.2 to 8.5 without test specimens. The conditioning shall conform to Table 1, with 2,0 I of sulfur dioxide.Thoroughly clean the test specimens before testing. The cleaning method depends on the nature of the surface and the contaminants. Abrasives shall not include the use of any abrasives or solvents that may attack the surface of the test specimens. Take care that the test specimens are not recontaminated after cleaning, by excessive or careless handling. If test specimens are cut from a large coated article, the cutting shalll be carried out in such a way that the coating is not damaged, especially in the area adjacent to the cut. Unless otherwise specified, the cut edges should be adequately protected by coating with a suitable medium that is stable under the conditions of test, such as wax or adhesive tape.BS ISO 22479 pdf download.