ASTM D5894 Cyclic Salt Fog/UV Exposure of Painted Metal

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.