A Study on the Effect of Acid Rain on Atmospheric Corrosion of Carbon Steel

概要

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This study was undertaken to find out if atmospheric corrosion of carbon steel is accelerated by acid rain in non-polluted atmosphere, in view of the situation that there is no positive proof showing such is the case, unlike the cases of copper, copper alloys and zinc. Carbon steel specimens were exposed to the rural atmosphere of Maebashi, and artificial rain, acid or neutral, was applied to some of the specimens. With neutral rain of low salt concentration, 1.2g/L, corrosion was the same as that for natural exposure to the atmosphere, but was accelerated by a factor of 3 if the pH was lowered to 2.5. With neutral and acid rains of appreciably high salt concentration, 6.0g/L, corrosion was about 2 and 4.5 times that for natural exposure. When the salt concentration was very high, the effect of low pH was not apparent presumably because of severe accelerating effect of chloride ions. The results demonstrate that acid rains with low or moderate salt concentrations do accelerate atmospheric corrosion of carbon steel through impairment of protective nature of rust films.
前橋工科大学の論文
2002-03-25