表面技术2017，Vol.46Issue(5)：12-16,5.DOI:10.16490/j.cnki.issn.1001-3660.2017.05.003
二次电压对AZ91D镁合金微弧氧化封孔的影响
Effect of Secondary Voltage on Micro-arc Oxidation Sealing of AZ91D Magnesium Alloy
摘要
Abstract
The work aims to improve corrosion resistance of micro-arc oxide film of magnesium alloy. Micro-arc oxidiza-tion was performed to AZ91D magnesium alloy, and holes in micro-arc oxide film of AZ91D magnesium alloy were sealed by adjusting secondary voltage. Phase, surface morphology and corrosion resistance of the micro-arc oxide film were investigated by means of XRD, SEM and electrochemical test. The film was mainly composed of MgO, MgF2, ZrO2 and Mg2Zr5O12, which were not affected by the secondary voltage. With the increase of secondary voltage, diameter and porosity of discharge micro-pores on the film first decreased and then increased. Compared with that not subject to secondary voltage, corrosion current de-creased by 2~3 orders of magnitude, polarization resistance increased by 1~2 orders of magnitude and corrosion resistance im-proved significantly when the secondary voltage was applied. At the secondary voltage of 160 V, polarization resistance of the film was the highest and the corrosion resistance was the best. Secondary voltage can seal the pores in micro-arc oxide film of AZ91D magnesium alloy to prevent corrosive liquid from entering into the substrate through micropores and improve corrosion resistance of the film.关键词
镁合金/微弧氧化/自封孔/耐蚀性/孔隙率/二次电压Key words
magnesium alloy/micro-arc oxidation/self-sealing/corrosion resistance/porosity/secondary voltage分类
矿业与冶金引用本文复制引用
陈宏,黄杰,陈永楠,郝建民,张鸽..二次电压对AZ91D镁合金微弧氧化封孔的影响[J].表面技术,2017,46(5):12-16,5.基金项目
国家自然科学基金资助(51301022) （51301022）
陕西省自然科学基金(2016JQ5032) Supported by the National Natural Science Foundation of China (51301022) and Shanxi Provincial Natural Science Foundation (2016JQ5032) （2016JQ5032）
