本文分析了我国七个试验点十七种钢的八年大气腐蚀试验结果 .表明 ,对碳钢和低合金钢 ,危害最大的污染是二氧化硫及氯离子 ,与公认一致 .但是 ,二氧化硫仅在开始头 1- 2年内危害突出 ,其后作用明显下降 .对非耐候钢 ,湿热条件在短期里对腐蚀的影响并不大 ,但长期暴露危害作用非常大 ,如果同时存在污染 ,更会造成很严重的腐蚀 ,值得特别注意 .由于腐蚀情况与时间因素有关 ,碳钢、低合金钢在不同腐蚀环境中 ,暴露第一年所显示的大气腐蚀性规律与长期暴露所显示的不同 ,如果用短期暴露数据判断钢的耐蚀性或环境的腐蚀性 ,都会导致错误的结论
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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