Immersion testing cyclic test procedure

In cyclic immersion tests the sample is periodically immersed in an electrolyse, for example by attaching it to a partially submerged wheel that slowly turns. With this method, it is easy to simulate the humidity cycles, but there is a major drawback during the immersion phase, the corrosion products can dissolve, in contrast to what happens normally in true atmospheric corrosion. This procedure therefore simulates atmospheric corrosion only in an imperfect way. 

Another variation of the immersion test is the cyclic test procedure where a test specimen is immersed for a period of time in the test environment, then removed and dried (either air diy or use of heat lamps), then re-immersed to continue the cycle. Normally hundreds of these cycles are completed during the course of the test program. In ASTM G 60, test specimens are dipped in a test solution before being exposed to atmospheres varying in relative humidity. The intent of the test is to develop a layered corrosion product similar to that found on sheltered outdoor exposure test specimens. These tests can be either manually performed or conducted in apparatus equipped for automatic cycling. 

Alternative immersion tests. Another variation of the immersion test is the cyclic test procedure, in which a test specimen is immersed for a period of time in a test environment, then removed and dried before being reimmersed to continue the cycle. Normally hundreds of these cycles are completed during the course of a test program. 

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