SNAP溶胶组成对镁合金涂层耐蚀性的影响

本文利用纳米自组装颗粒工艺(SNAP)在AZ31B镁合金表面制备了防腐涂层。通过透射电镜(TEM)和扫描电镜(SEM)观察及电化学阻抗谱(EIS)、电导率测试等，对SNAP溶胶的纳米粒子形态和电导率，以及SNAP涂层的表面形貌和耐蚀性进行了测试，研究了不同含量的有机硅烷前躯体3-缩水甘油醚丙基三甲氧基硅烷(GPTMS)和正硅酸乙酯基硅烷(TEOS)、溶剂水、助溶剂无水乙醇、交联剂三乙烯四胺(TETA)等对镁合金SNAP涂层耐蚀性的影响。研究结果表明，随着溶胶中TEOS和TETA含量的增大，镁合金涂层耐蚀性呈先增大后减小的趋势；随着溶胶中水含量的增大，镁合金涂层耐蚀性提高；溶胶中无水乙醇的含量较低时，对镁合金涂层耐蚀性的影响较小。

Effect of Sol Compositions on Corrosion Protection of SNAP Film Coated on Magnesium Alloy

In this paper, anticorrosion film was prepared on the surface of AZ31B magnesium alloy by SNAP (self-assembled nanophase particle) technology. Nanoparticle morphology, sol conductivity, surface morphology and corrosion protection of SNAP film were studied by transmission electron microscopy (TEM), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and conductivity, respectively. And we obtained content effect of precursors of 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS), solvent of water, cosolvent of ethanol and crosslink agent of triethylene tetramine (TETA) on the corrosion protection of the SNAP film. The results indicated that, the corrosion protection of the SNAP film were improved when the content of TEOS, TETA and water increase, however it decreased when the contents of TEOS and TETA increased further; The effect on the corrosion protection of the SNAP film could be neglected when the ethanol content was small.