ASTM D5894 Cyclic Salt Fog/UV Exposure of Painted Metal

ASTM D5894 Cyclic Salt Fog/UV Exposure of Painted Metal

ASTM D5894 practice evaluates durability of painted metal samples exposed to corrosive atmospheres and UV rays. This practice includes basic principles and operating methods of measuring and controlling cyclic corrosion/UV exposure. ASTM D5894 is applicable for air-dry industrial maintenance paints on steel and also for primers rich in zinc for cathodic protection.

    Scope:

    The ASTM D5894 practice includes basic principles and operating practices for cyclic corrosion/UV exposure of paints on metal. The corrosion of painted metals is affected by many factors such as rain, UV light, corrosive atmosphere, wet/dry cycling, condensed dew, and temperature cycling. ASTM D5894 is applicable for air-dry industrial maintenance paints on steel and also for primers rich in zinc for cathodic protection.

    Test Procedure:

    For ASTM D5894, the samples are exposed to alternating exposures in a fog/dry cabinet and a  UV/condensation cabinet. The samples used are painted metal pieces. Alternating one-week periods of cyclic corrosion is used with a dry/wet cycle as stated by ASTM G85 and a fluorescent UV exposure as stated by ASTM G154. The results achieved are used to compare the relative durability of the materials.

    Sample size:

    For ASTM D5894, three flat samples are required per product. The typical dimensions of the samples are 3×6 inches.

    Data:

    In ASTM D5894, the end results are reported in terms of the test cycle, UV/condensation cabinet cycle, fog/dry cabinet cycle, and an electrolytic solution.

    Conclusion:

    ASTM D5894 practice evaluates durability of painted metal samples exposed to corrosive atmospheres and UV rays.

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