Q235钢表面铈盐掺杂乙烯基三乙氧基硅烷膜制备及耐蚀性能

PREPARATION OF CERIUM-SALT-DOPED VINYLTRIETHOXYSILANE FILMS ON SURFACES OF Q235 STEEL AND ITS CORROSION-RESISTING PROPERTY

在Q235钢表面制备铈盐掺杂乙烯基三乙氧基硅烷膜。利用电化学阻抗谱(EIS)确定了最佳铈盐添加量,利用EIS和动电位极化法研究了涂覆掺杂硅烷膜的Q235钢在3.5%NaCl水溶液中的耐蚀性能,利用扫描电镜(SEM)观察了掺杂硅烷膜的表面形貌。结果表明,铈盐最佳添加量为1×10^(-3) mol/L,经涂镀掺杂硅烷的Q235钢在腐蚀过程中的阳极反应和阴极反应受到抑制,与空白Q235钢相比其腐蚀电流密度减小近3个数量级,极化电阻提高3个数量级,低频阻抗值提高至少4个数量级。

Vinyltriethoxysilane films doped with cerium nitrate （Ce（NO3）3） were prepared on the surfaces of Q235 steel. The optimum addition level of cerium nitrate was studied by electrochemical impedance spectroscopy （EIS）. The corrosion resistance of Q235 steel coated by the doped silane films during immersion in the aqueous solution of 3.5% NaCl was investigated by electrochemical impedance spectroscopy （EIS） and by the potentiodynamic polarization. Scanning electron microscope （SEM） was used to observe the morphology of surface of the doped silane films. The results showed that the optimum addition level of Ce（NO3）3 is 1 × 10^-3 mol/L. The anode reaction and the cathode reaction on the interface of Q235 steel coated by the doped silane films during the corrosion were restrained. The corrosion current density of the Q235 steel coated with the doped silane films decreases by almost three orders of magnitude and its polarization resistance increases by about three orders of magnitude as well as its low-frequency impedance increases by more than four orders of magnitude when compared with those of the blank steel sheets during immersion in 3.5% NaCl aqueous solution.