316L和Hastelloy C合金在不同温度循环废酸中的耐蚀性能

为了解316L和HastelloyC合金在不同温度的循环废酸中的耐蚀性能，利用静态挂片试验、电化学试验和扫描电镜研究了2种合金在不同温度循环废酸中的腐蚀速率及形貌。结果表明：在50℃的循环废酸中，316L和HastelloyC合金均具有优异的耐蚀性，且耐蚀性相当；316L和HastelloyC合金的腐蚀速率均随循环废酸温度的升高而增加，316L合金的增加缓慢，HastelloyC合金的增加急剧；当温度由50℃升高到80℃时，循环废酸的氧化性增加，Mo含量较高的HastelloyC合金在循环废酸中不能形成完整、致密的钝化膜，从而使其耐蚀性急剧下降。

Corrosion Resistance of 316L Stainless Steel and Hastelloy C in Circulating Disposal Acid of Different Temperature

Static coupon-hanging tests and electrochemical tests were conducted to investigate the corrosion rates o 316L stainless steel and Hastelloy C in circulating disposal acid o different temperature.The morphology of the corroded surface was observed with a scanning electron microscope.It was found tha both 316L stainless steel and Hastelloy C possessed excellen corrosion resistance in circulating disposal acid of 50 ℃,and their corrosion resistance in this case was similar.With the increase of temperature of circulating disposal acid,the corrosion rate of 316L stainless steel gradually rose,but that of Hastelloy C rose drastically therewith.When the temperature of the circula ting disposal acid rose from 50 ℃ to 80 ℃,the oxidizing capability of the disposal acid was enhanced.As a result,in the circulating disposal acid of 80 ℃,it was impossible for complete and compact passivation film to form on the surface of Hastelloy C with a higher Mo content,corresponding to drastically reduced corrosion resistance of the alloy thereat.