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In order to investigate the effects of environmental factors on the atmospheric corrorion of carbon steel in Niigata, the rate of corrosion and the amount of chemical pollutants in atmosphere were determined by gauze method and the data of some meteorological elements were obtained for four years from 1974 to 1978. It looks the amount of sulfate, sulphur oxides and nitrogen oxides in industrial area were larger than the ones in the others. The effects of those factors on the rate of corrosion were investigated and the correlations of some couples among the factors were analyzed by the single correlation coefficients. Summary of the results are as follows: 1) The effects of chloride, sulfate and sulphur oxides on the rate of corrosion showed strong positive correlations and their influences were singificant. 2) The effect of wind velocity on the rate of corrosion showed strong positive correlation and it was described in the previous paper. 3) The effect of each element of air temperature, duration of sunshine and solar radiation on the rate of corrosion showed strong negative correlation. It seems to conceal the effects of the meteorological elements because the amount of chloride, sulfate and sulphur oxides in atmosphere become large values in cold winter season. 4) The effects of precipitations and relative humidity on the rate of corrosion were very weak, then the both elements were not important in Niigata. 5) The correlation coefficient between wind velocity and each factor of chloride, sulfate and sulphur oxides showed strong positive value and the one between air temperature (duration of sunshine and solar radiation) and the each factor above showed strong negative value. It seems to be understandable because chloride was carried by northwestern monsoon from seaside and sulphur oxides were increased by discharged gases from combustion in cold winter season.

The Effects of Environmental Factors on Atmospheric Corrosion of Carbon Steel in Niigata