Cai-Feng LIANG


Data of eight year atmospheric exposures of 17 steels at 7 sites in China were analyzed.The result showed that the most detrimental pollution is sulfur dioxide and chloride ion for corrosion of carbon steels and low alloy weathering steels.This is in accordance with the common knowledge.The effect of sulfur dioxide is serious in the first few years and becomes weak obviously in the later years.The environment factor of humid hot is much more important in long run than the ordinarily acknowledged humidity,pollution for non weathering steels,although it is not obvious in the beginning.If pollution were existed,a severe corrosion may resulted.As a result of these two factors,the corrosivity obtained in short term exposure is different from that obtained from long term exposure.

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