Metal Finishing Guide Book

2013

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The usefulness of testing coatings for resistance to water, or high humidity, as a good indicator of their service life in service environments of that type resulted in the ASTM D1735 Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus and the ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity. Demand for improved evaluation of decorative copper/nickel/chromium or nickel/chromium coatings on steel, zinc alloys, aluminum alloys, and plastics designed for severe service resulted in the ASTM B368 Standard Test Method for Copper Accelerated Acetic Acid-Salt Spray (Fog) Testing, widely known by its acronym as the "CASS" test. Additional needs for testing of product resistance to harsh industrial environments led to the development of the ASTM G85 Standard Practice for Modified Salt Spray (Fog) Testing with its 5 included corrosion test variations and the ASTM G87 Standard Practice for Conducting Moist SO2 Tests. The ASTM G85 variations (tests): Annex 2, Annex 3, Annex 4, and Annex 5 along with ASTM G87 were developed to subject test pieces to cycles of differing environments to more closely resemble the changes occurring in pertinent real-world environments. See Table I for information on "static" versus "cyclic" environment tests. With the wide variety of materials and coatings, their uses, 535

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