低合金钢耐大气腐蚀规律研究

为快速评价和研究低合金钢在以二氧化硫为主工业污染环境中的耐蚀性，采用干湿复合循环实验、X射线衍射和扫描电镜等方法研究了5种钢在试验环境中的腐蚀规律及腐蚀产物特征.结果显示出5种材料的耐蚀性降低的顺序为6CuP，CortenA，09CuP，20Steel，A3，没有添加合金元素的A3钢的腐蚀速率是最耐蚀的06CuP的249倍；腐蚀失重随时间均遵从指数衰减规律：Y＝Y-0+Ae{-t／B}.数据拟合计算的指前因子-A／B顺序与5种材料的耐蚀顺序一致.

ATMOSPHERIC CORROSION OF FIVE LOW ALLOY STEELS

For rapidly evaluating corrosion resistance to atmospheres containing SO-2 as the main polluotands of low alloy steels, five selecded steels were tested by means of an immersion-wet-dry cycle test method,then the electrochemical conosron feature of the rusted steels after corrosion test was studied by XRD and SEM etc.The results showed that a decrement order of the corrosion resistance of the 5 steels is as follow: 06CuP,CortenA,09CuP,20Steel,A3.The corrosion rate of A3 steel was 2.49 times higher than 06CuP which was the most corrosion resistant among the 5 steels.The weigh loss of the 5 steels all followed exponential decay function: Y=Y 0+A e - t/B .The sequence of the factor - A/B of the 5 steels obtained by fitting calculation was insistent with that of corrosion resistance.