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,对润湿时间、二氧化硫及盐粒子的污染作用提出了新的看法。对非耐候钢,湿热条件对长期腐蚀的影响非常大,如果加上污染,会造成特别高的腐蚀。讨论了用气象及污染特征划分大气腐蚀性等级的ISO9223国际标准。碳钢、低合金钢在不同腐蚀环境中,暴露第一年期间所显示的大气腐蚀规律与长期暴露所显示的不同,因此用钢的第一年腐蚀结果来测定大气腐蚀性是不妥当的。
The results of 8 year atmospheric exposure of 17 steels at 7 sites in China were examined. Some new concepts about the effect of time of wetness, pollution of sulfate and chloride were suggested. For carbon steels, humid and hot condition had significant effect during the long exposure. With addition of pollutants, severer corrosion might be observed. The applicability of international standard ISO9223, which illustrated the classification of corrosivity by means of meteorology and pollution data, was discussed. The relative corrosivity order arranged according to one year exposure data was different from that deduced from long term exposure results. It was not appropriate to evaluate corrosivity only by means of one year exposure.
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