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.
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 with a dry/wet cycle is used 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 materials.
Three, flat samples are required per product. The typical dimensions of samples are 36 inches.
The end results are reported in terms of the test cycle, UV/condensation cabinet cycle, fog/dry cabinet cycle, and an electrolytic solution.