不锈钢201、304和316L在模拟污水管道反应器中的腐蚀  

Corrosion of Stainless Steel 201,304 and 316L in the Simulated Sewage Pipes Reactor

作　　者：鲍国栋[1,2] 左剑恶[1] 王雅娇[1] 干里里[1] 

机构地区：[1]清华大学环境学院,环境模拟与污染控制国家重点联合实验室,北京100084 [2]清华大学深圳研究生院,深圳518055

出　　处：《环境科学》2014年第8期3002-3006,共5页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2011ZX07301-002)

摘　　要：研究了作为污水管道局部修复材料的不锈钢201、304和316L在模拟污水管道反应器中的腐蚀行为.采用动电位法研究了第7、14、21、56 d这3种材料在全部浸没在污水或以2 d为周期交替浸没在污水两种条件下的腐蚀电位和腐蚀速率,采用电化学阻抗谱(EIS)研究了第56 d这3种材料的电极过程,利用扫描电镜(SEM)和能谱(EDS)分析了第56 d腐蚀点的形貌和成分.结果表明,在两种条件下304和316L的耐腐蚀性均好于201,腐蚀速率均小于201;3种不锈钢在交替浸没条件下的耐腐蚀性均优于全浸条件,在交替浸没条件下的腐蚀速率小于全浸条件;在304和316L的表面形成了局部点腐蚀,在201的表面形成了区域性腐蚀.The corrosion behavior of stainless steel 201,304 and 316 L which would be used as sewer in-situ rehabilitation materials was studied in the simulated sewage pipes reactor. The corrosion potential and corrosion rate of these three materials were studied by potentiodynamic method on the 7th,14 th,21st,56 thday under two different conditions which were full immersion condition or batch immersion condition with a 2-day cycle. The electrode process was studied by Electrochemical Impedance Spectroscopy（EIS） on the56 thday. The microstructure and composition of the corrosion pitting were analyzed by Scanning Electron Microscope（SEM） and Energy Dispersive Spectrometer（EDS） on the 56 thday. The results showed that 304 and 316 L had much better corrosion resistance than 201 under both conditions. 304 and 316 L had much smaller corrosion rate than 201 under both conditions. The corrosion resistance of all three kinds of stainless steel under the batch immersion condition was much better than those under the full immersion condition. The corrosion rate of all three kinds of stainless steel under the batch immersion condition was much smaller than those under the full immersion condition. Point pitting corrosion was formed on the surfaces of 304 and 316 L. In comparison,a large area of corrosion was formed in the surface of 201.

关 键 词：不锈钢 修复材料 污水 动电位 电化学阻抗谱 

分 类 号：X703.3[环境科学与工程—环境工程]