甘氨酸对AZ31B镁合金阳极氧化膜的影响

Effect of Glycine on Anodic Oxide Film of AZ31B Magnesium Alloy

以环保型碱性硅硼体系为基础电解液,以甘氨酸为添加剂,对AZ31B镁合金进行阳极氧化处理。结果表明:在相同的电流密度和氧化时间下,向电解液中添加甘氨酸所得氧化膜的厚度增加、膜厚分布更均匀;氧化膜的形貌更为致密、平整;氧化膜的膜电阻和电荷传递电阻增大,对基底的保护性能增强,从而改善镁合金的耐蚀性。甘氨酸的质量浓度为5g/L时所得氧化膜具有最优的结构和性能。

Anodizing of AZ31B magnesium alloy was carried out selecting eco-friendly alkaline silicon boron system as basis electrolyte and glycine as an additive. Results showed that, for the same current density and oxidation time, the oxide film obtained with the electrolyte containing glycine has smoother and compacter surface, more uniform thickness, higher film resistance and charge-transfer resistance compared with that obtained without glyeine. Moreover, oxide film play a protection function, which improved the corrosion resistance of magnesium alloy. The oxide film obtained under the condition of glycine mass concentration 5 g/L present the optimal structure and performances.