三种土壤对X70钢腐蚀行为的比较  

Corrosion Behavior Comparison of X70 Steel in Three Different Environments

作　　者：杜翠薇[1] 李晓刚[1] 武俊伟[1] 宋义全[1] 徐璟[1] 

机构地区：[1]北京科技大学材料科学与工程学院腐蚀与防护中心,北京100083

出　　处：《北京科技大学学报》2004年第5期529-532,共4页Journal of University of Science and Technology Beijing

基　　金：科技基础性工作专项资助项目(No.2001DEA30040);国家"973"项目(No.19990650)

摘　　要：通过在库尔勒地区现场土壤、实验室内含水饱和土壤和土壤模拟溶液中埋设和浸泡试样的方法,利用SEM,EDS,XRD等手段以及失重法对X70钢在库尔勒土壤中腐蚀行为进行了研究.结果表明,在实验期间内,三种不同环境下的腐蚀速率大小顺序为:模拟溶液>现场土壤>饱和含水土壤.这因为在现场实验中,土壤中存在微生物腐蚀而使X70钢腐蚀速率较高;在含水饱和土壤中,水分降低了土壤透气性,土壤阻碍了离子交换,腐蚀速率大大降低;在模拟溶液中,电化学反应非常容易进行,腐蚀速率很高.Corrosion behaviors of X70 steel in the environments of Ku'erle soil corrosion station, soil saturated with water and simulated soil solution were studied by means of macroscopical observations, SEM, EDS, XRD, weight-loss method etc. The results reveal that the ranking of corrosion rate from the biggest is simulated soil solution, Ku'erle field soil, and soil saturated with water. It can be explained that the occurrence of microbiologically influenced corrosion leads to a high corrosion rate of X70 steel in Ku'erle field soil. In soil saturated water, water reduces the permeability of air, and soil blocks the ion exchange of X70 steel, which result in a low corrosion rate. In simulated soil solution, electrochemical reactions are easiest to take place, so the corrosion rate is the highest.

关 键 词：X70钢 库尔勒土壤 模拟溶液 土壤腐蚀 

分 类 号：TG172.4[金属学及工艺—金属表面处理]