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针对不同稀土Ce含量的低镍铬锰氮奥氏体不锈钢,采用电化学动电位再活化法和Cu-CuSO4-16%H2SO4热酸浸泡法研究了两种热处理状态下不同铈含量试样的晶间腐蚀程度。研究结果表明:两种热处理状态下,未添加稀土试样腐蚀最严重。不同稀土含量的试样750℃敏化处理2 h比650℃敏化处理2 h腐蚀程度略重。从两组试验的金相显微组织照片和EPR活化率数据来看,两种热处理状态稀土Ce含量为0.053%时奥氏体不锈钢抗晶间腐蚀能力最强,但当铈含量增加到0.067%时,试样腐蚀又开始恶化。
Aiming at low Ni, Cr, Mn and N austenitic stainless steels with different rare earth contents, two kinds of samples with different cerium content under heat treatment were studied by electrochemical kinetic potentiodynamic reactivation method and Cu-CuSO4-16% H2SO4 hot acid immersion method Between the degree of corrosion. The results show that: under the two heat treatment conditions, the sample without rare earth corrosion is the most serious. The specimens with different RE content sensitized at 750 ℃ for 2 h had slightly more corrosion than those treated at 650 ℃ for 2 h. From the metallographic microstructure pictures and the EPR activation rate data of the two groups of experiments, the capability of intergranular corrosion resistance of the austenitic stainless steel is the strongest when the Ce content of the two heat treatment states is 0.053%, but when the Ce content is increased to 0.067% Sample corrosion began to deteriorate again.