Atmospheric corrosion of carbon steels and weathering steels in Taiwan

Abstract

The corrosion performance of carbon steels ASTM A36 and JIS SS41 and weathering steels ASTM A588 Grade Band JIS SP AH (Acr-Ten A) were studied after exposure for several periods up to 8 years in three atmospheric environments in Taiwan. The results are in agreement with kinetic equations of the form C = At⁸, where C is the corrosion loss, t is time, and A and B are constants. The weathering steels have better corrosion resistance than carbon steels, especially in an industrial coastal area, and a marked decrease in the corrosion rate is observed when the weathering steel contains high phosphorus. However, the rating of corrosion resistance of weathering steels relative to carbon steels does not conform to the specification ASTM A242–87. These results, correlated with the composition and the structure of the rust as well as with environmental factors, are examined and discussed.

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