904L不锈钢在5g/L H_2SO_4溶液中的腐蚀行为

为了研究904L不锈钢在5 g/L H2SO4溶液中的腐蚀行为,采用动电位极化测试、电化学阻抗测试(EIS)和X射线光电子能谱(XPS)研究其腐蚀行为,并分析其钝化膜的组成.结果表明,904L不锈钢极化后会发生自钝化,钝化区间为-0.2~0.6 V,电荷传递电阻为4 801Ω/cm2,表明904L不锈钢具有较强的耐蚀性能.X射线光电子能谱(XPS)研究表明,钝化膜主要成分为Cr2O3、Cr OOH、Cr(OH)3等化合物.因而904L不锈钢在5 g/L H2SO4溶液中可以表现出良好的耐蚀性能.

Corrosion behavior of 904L stainless steel in 5 g/L H2SO4 solution

In order to investigate the corrosion behavior of 904L stainless steel in 5 g/L H₂SO₄ solution, the potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy(EIS)and X ray photoelectron spectrometer(XPS)were used to characterize the corrosion behavior and analyze the composition of passive film. The results show that the self-passivation of 904L stainless steel can occur after the polarization, the passivation range is -0.2~0.6 V, and the charge transfer resistance is 4 801 Ω/cm². It indicates that the 904L stainless steel has stronger corrosion resistance. The results of XPS analysis show that the passive film is mainly composed of such compounds as Cr₂O₃, CrOOH and Cr(OH)₃. Therefore, the 904L stainless steel can exhibit good corrosion resistance in 5 g/L H₂SO₄ solution.