ASTM B117-2019 pdf free download

ASTM B117-2019 pdf free download.Standard Practice for Operating Salt Spray (Fog) Apparatus
5. Test Specimens
5.1 The type and number of test specimens to be used, as well as the criteria for the evaluation ofthe test results, shall be defined in the specifications covering the material or product being exposed or shall be mutually agreed upon between the purchaser and the seller.
6. Preparation of Test Specimens
6.1 Specimens shall be suitably cleaned. The cleaning method shall be optional depending on the nature ofthe surface and the contaminants. Care shall be taken that specimens are not recontaminated after cleaning by excessive or careless handling. 6.2 Specimens for the evaluation ofpaints and other organic coatings shall be prepared in accordance with applicable specification(s) for the material(s) being exposed, or as agreed upon between the purchaser and the supplier. Otherwise, the test specimens shall consist of steel meeting the requirements of Practice D609 and shall be cleaned and prepared for coating in accordance with the applicable procedure of Practice D609. 6.3 Specimens coated with paints or nonmetallic coatings shall not be cleaned or handled excessively prior to test. 6.4 Whenever it is desired to determine the development of corrosion from an abraded area in the paint or organic coating, a scratch or scribed line shall be made through the coating with a sharp instrument so as to expose the underlying metal before testing. The conditions of making the scratch shall be as defined in Test Method D1654, unless otherwise agreed upon between the purchaser and the seller. 6.5 Unless otherwise specified, the cut edges of plated, coated, or duplex materials and areas containing identification marks or in contact with the racks or supports shall be protected with a suitable coating stable under the conditions of the practice.N OTE 2—Should it be desirable to cut test specimens from parts or from preplated, painted, or otherwise coated steel sheet, the cut edges shall be protected by coating them with paint, wax, tape, or other effective media so that the development of a galvanic effect between such edges and the adjacent plated or otherwise coated metal surfaces, is prevented.
7. Position of Specimens During Exposure
7.1 The position of the specimens in the salt spray chamber during the test shall be such that the following conditions are met: 7.1.1 Unless otherwise specified, the specimens shall be supported or suspended with the surface of interest at an angle between 15° and 30° from the vertical. It is recommended that the orientation of specimens in the cabinet be consistent to minimize variability. 7.1.2 The specimens shall not contact each other or any metallic material or any material capable of acting as a wick. 7.1.3 Each specimen shall be placed to permit unencum- bered exposure to the fog. 7.1.4 Salt solution from one specimen shall not drip on any other specimen. N OTE 3—Suitable materials for the construction or coating of racks and supports are glass, rubber, plastic, or suitably coated wood. Bare metal shall not be used. Specimens shall preferably be supported from the bottom or the side. Slotted wooden strips are suitable for the support offlat panels. Suspension from glass hooks or waxed string may be used as long as the specified position of the specimens is obtained, if necessary by means of secondary support at the bottom of the specimens.
8. Salt Solution
8.1 The salt solution shall be prepared by dissolving 5 6 1 parts by mass of sodium chloride in 95 parts of water conforming to Type IV water in Specification D1193 (except that for this practice limits for chlorides and sodium may be ignored). Careful attention should be given to the chemical content of the salt. The salt used shall be sodium chloride with not more than 0.3 % by mass of total impurities. Halides (Bromide, Fluoride, and Iodide) other than Chloride shall constitute less than 0.1 % by mass of the salt content. Copper content shall be less than 0.3 ppm by mass. Sodium chloride that has had anti-caking agents added shall not be used because such agents may act as corrosion inhibitors. See Table 1 for a listing of these impurity restrictions. Upon agreement between the purchaser and the seller, analysis may be required and limits established for elements or compounds not specified in the chemical composition given above.