研究由NaOH、Na2SiO3、Na2B4O7组成的电解液体系中不同葡萄糖浓度对AZ31B 镁合金阳极氧化膜性能的影响.通过电压—时间曲线、Cass 盐雾试验、SEM、EDS、XRD、EIS 和动电位极化曲线等考察阳极氧化膜的性能和表面形貌.结果表明:葡萄糖可以有效地抑制火花放电,使氧化膜致密,微孔分布均匀及孔径变小;与未添加葡萄糖所形成的氧化膜相比,添加葡萄糖所形成的氧化膜的自腐蚀电位正移,自腐蚀电流密度降低;当葡萄糖浓度为10 g/L 时所制备氧化膜的耐蚀性能最优,其自腐蚀电位和自腐蚀电流密度分别为?1.265 V 和1.55×10?8 A/cm2.
@@@@The effect of glucose concentration on the properties of anodizing film on AZ31B magnesium alloy was investigated in the electrolyte composed of NaOH, Na2SiO3 and Na2B4O7. The properties and surface morphologies of the anodizing films were studied by voltage—time curves, Cass salt spray test, scanning electron microscopy(SEM), energy dispersion spectrometry(EDS), X-ray diffractometry (XRD), electrochemical impedance spectroscopy(EIS) and potentiodynamic polarization, respectively. The results show that the glucose can effectively suppress spark discharge. In the presence of glucose, a uniform and compact anodizing film with small aperture is obtained. Compared with the anodizing film formed in the electrolyte without glucose, the self-corrosion potential shifts to the positive direction and self-corrosion current density is reduced for the anodizing film formed in the electrolyte with the addition of glucose. The anodizing film formed in the electrolyte with 10 g/L glucose has the excellent corrosion resistance with self-corrosion potential of?1.265 V and self-corrosion current density of 1.55×10?8 A/cm2, respectively.
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