材料期刊网

为了研究节镍型含稀土双相不锈钢在中性氯化物溶液中的点蚀行为,采用阳极极化曲线、交流阻抗、扫描电镜(SEM)及X射线能谱仪(EDS)等方法研究了微量稀土元素对23Cr型双相不锈钢耐点蚀性能的影响.研究结果表明,加稀土后,23Cr型双相不锈钢在1.0 mol/L NaCl溶液中的点蚀电位及钝化能力明显提高,稀土含量为0-028％的实验钢耐点蚀能力最强,稀土能提高23Cr型双相不锈钢的耐点蚀性能;硫化物夹杂是23Cr型双相不锈钢的主要点蚀诱发源;合适的稀土含量可以有效的净化钢液,变质长条硫化物夹杂为球状稀土夹杂;稀土夹杂弥散分布在钢中,且相互独立,不形成腐蚀的活性通道,抑制了23Cr型双相不锈钢点蚀的发生.

In order to study the pitting corrosion resistance of rare earth and saving Ni alloying 23Cr type duplex stainless in neutral chloride solution,the effects of rare earth element on corrosion resistance of 23Cr type duplex stainless steel (DSS)were investigated by anodic polarization curve,electrochemical impedance spectroscopy (EIS),scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS).The results indicate that the pitting potential and passivation ability of 23Cr duplex stainless steel in 1.0 mol/L NaCI solution are significantly improved.The pitting corrosion resistance of 23Cr duplex stainless steel with 0.028％ RE is the best.The rare earth can improve the corrosion resistance of 23Cr duplex stainless steel.The sulphide inclusion is the main origin of pitting.The appropriate content of rare earth can effectively purify liquid steel and the strip sulphide inclusion can be replaced by spherical rare earth inclusion.The rare earth inclusion is dispersed in steel and independent of each other.And the rare earth inclusion doesn't form active path of corrosion and inhibits the occurrence of the pitting corrosion.