葡萄糖对镁合金阳极氧化膜性能的影响

屠晓华^{1, 2}，陈 利^{1, 2, 3}，吴建一^{1, 2, 3}

(1. 嘉兴学院 生物与化学工程学院，嘉兴 314001；
2. 嘉兴市化工清洁工艺重点实验室，嘉兴 314001；
3. 常州大学 石油化工学院，常州 213164)

摘 要：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。

关键词：AZ31B镁合金；葡萄糖；阳极氧化；耐蚀性

Effect of glucose on properties of anodizing film on AZ31B magnesium alloy

TU Xiao-hua^{1, 2}, CHEN Li^{1, 2, 3}, WU Jian-yi^{1, 2, 3}

(1. College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China;
2. Key Laboratory of Clean Chemical Process of Jiaxing, Jiaxing 314001, China;
3. School of Petr)

Abstract: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.

Key words:AZ31B magnesium alloy; glucose; anodizing; corrosion resistance