ASTM G85-19 pdf free download.Standard Practice for Modified Salt Spray (Fog) Testing.
1.1 This practice covers and sets forth conditions for five modifications in salt spray (fog) testing for specification purposes. These are in chronological order of their developmc nt:
1.1.1 Annex A1, acetic acid-salt spray test, continuous.
1.1.2 Annex A2, cyclic acidified salt spray test.
1.1.3 Annex A3, seawater acidified test, cyclic (SWAAT).
1.1.4 Annex A4, SO2 salt spray test, cyclic.
1.1.5 Annex A5, dilute electrolyte cyclic fog dry test.
1 .2 This practice does not prescribe the type of modification, test specimen or exposure periods to be used for a specific product, nor the interpretation to be given to the results.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
3. Significance and Use
3.1 This practice is applicable to ferrous and nonferrous metals; also organic and inorganic coatings. The variations described herein are useful when a different or more corrosive environment than the salt fog described in Practice B 117 is desired.
4. Apparatus
4.1 cabinet:
4.1.1 The apparatus required for salt spray (fog) testing consists of a fog chamber, a salt solution reservoir, a supply of suitably conditioned compressed air, one or more atomizing nozzles, specimen supports, provision for heating the chamber, and necessary means of control. The size and detailed construction of the cabinet are optional. provided the conditions obtained meet the requirements of this practice. The material of construction shall be such that it will not affect the corrosiveness of the fog. Suitable apparatus that may be used to obtain these conditions is described in Appendix XI of Practice B 117 wiih necessary modifications described in each annex of this practice.
4.1.2 Design the cabinet so that drops of solution that accumulate on the ceiling or cover of the chamber do not fall on the specimens being tested. Do not return drops of solution that fall from the specimens to the solution reservoir for respraying.
4.1.3 Equip the cabinet with one or more timing devices to provide for intermittent spraying or periodic introduction of a gas. or both.ASTM G85 pdf download.