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硅烷处理对镁合金具有良好的保护性。为了抑制Mg-7Gd-5Y-Nd-Zr(EW75)稀土镁合金和Ti-6Al-4V(TC4)钛合金的电偶腐蚀作用,以自腐蚀镁合金为对照组,对硅烷改性和未改性的镁合金与TC4钛合金的电偶腐蚀进行了研究。用数码照片和扫描电镜(SEM)观察分析了浸泡48 h后的镁合金表面形貌,样品的自腐蚀电流密度和电偶腐蚀电流密度分别用极化曲线和电偶腐蚀测量来表征获得。结果表明,硅烷膜可以减少失重比,使腐蚀形式由点腐蚀变为均匀腐蚀,因此硅烷改性的镁合金比未改性的镁合金具有更好的抗电偶腐蚀能力,其原因是硅烷膜可以提高镁合金的电位,并减小电偶腐蚀电流密度。
Silane treatment of magnesium alloy has good protection. In order to restrain the galvanic corrosion of Mg-7Gd-5Y-Nd-Zr (EW75) rare earth magnesium alloy and Ti-6Al-4V (TC4) titanium alloy, self-corrosion magnesium alloy was used as control group, Galvanic corrosion of a kind of magnesium alloy and TC4 titanium alloy was studied. The surface morphology of the magnesium alloy after immersion for 48 h was observed by digital photos and scanning electron microscopy (SEM). The self-corrosion current density and the galvanic corrosion current density of the samples were respectively characterized by polarization curves and galvanic corrosion measurements. The results show that the silane film can reduce the weight loss ratio, the corrosion form from point corrosion to uniform corrosion, so the silane modified magnesium alloy than the unmodified magnesium alloy has better resistance to galvanic corrosion, the reason is the silane film Magnesium alloy can increase the potential, and reduce galvanic corrosion current density.