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It has been generally agreed that the conventional salt spray test does not correlate nor simulate actual corrosion in service. Needs for a better test method instead of the salt spray test have risen also in Japan, and the various types of cyclic corrosion tests have been designed particularly in automotive and related companies. These tests are widely utilized because of better reproducibi1ity and acceleration.
To unify these test methods the Society of Automotive Engineers in Japan organized a technical committee. After 5 years of study JASO M 609 Standard for metallic and paint coatings on steel was published in 1991. Another standard for automotive parts was made in 1992. Both are basically the same cyclic corrosion test (CCT) which comprises 2 hours of salt spray, followed by 4 hours of dry and 2 hours of wet condition per cycle.
They have been also applied to other industrial fields. Some modified CCT combined with artificial light exposure have also been developed.
corrosion test, cyclic corrosion test, salt spray test, outdoor exposure, light exposure
President, Suga Test Instruments Co., Ltd, Tokyo,