Atmospheric Corrosion of Galvanized Steel and Stainless Steel in Yokohama and Mt. Oyama

Abstract

At Mt.Oyama in the southwest of Kanto Plains, acid fog has occurred frequently and the dieback of virgin fir forest has been observed. In this study, we placed the metal samples of galvanized steel and stainless steel at Mt. Oyama mountaintop and in Yokohama and analyzed the characteristics of their surfaces by SEM every three months to assess the effect of acid fog on the metal corrosion. We also investigated the effects of simulated fog water on the corrosion of metal samples. For the galvanized steel, the corrosion was induced by the chloride ion with high concentration in acidic solution. For the stainless steel, the progress of corrosion was observed under neutral pH condition with chloride ion, and furthermore, the corrosion was accelerated under acidic condition.