溶剂含水量对430不锈钢表面PFDS自组装膜缓蚀性能的影响

Effect of Water in the Solvent on the Corrosion Inhibition Performance of PFDS SAMs on the Surface of 430 Stainless Steel

利用傅里叶变换红外光谱(FTIR)、极化曲线、交流阻抗、接触角测试和原子力显微镜(AFM)研究了全氟癸基三乙氧基硅烷(PFDS)自组装膜的结构、自组装溶液中含水量对组装膜吸附行为及缓蚀性能的影响。结果表明:通过浸泡法可以在430不锈钢表面形成PFDS自组装膜,吸附PFDS分子后,430不锈钢表面由亲水性变为疏水性;自组装溶液中含水量对膜的耐蚀性有较大的影响,且自组装膜的缓蚀效率随着自组装溶液中含水量的增大,先增大后减小。当水的体积分数为40%时,组装膜的缓蚀效率达到最大值89%。

Fourier transform infrared （FTIR） spectroscopy, polarization curves , electrochemical impedance spec- troscopy , contact angle and atomic force microscope were used to investigate the structure of the 1H, 1H, 2H, 2H-Perfluorodecyltriethoxysilane （PFDS） SAM, and the effect of water content in the assembling solution on the self-assembled behavior and the corrosion inhibition performance of the PFDS SAM. The results show that PFDS SAM can be formed by immersion method, and the PFDS molecular modified 430SS surface becomes hydrophobic from hydrophilic; The content of the water in the assembly solution has a greater effect on the corrosion resistance of SAM on the surface of 430SS, and with the content of the water in the assembly solution increasing, the corro- sion inhibition efficiency （IE） of PFDS SAM first increases and then decreases. The IE value reaches the maximum 89% when the content of the water increases to 40%.