刘志江,朱卫国.镁合金电化学转化膜的组成及反应机理[J].表面技术,2018,47(7):209-213.
LIU Zhi-jiang,ZHU Wei-guo.Constituents and Reaction Mechanism of Electrochemical Conversion Coating on Magnesium Alloys[J].Surface Technology,2018,47(7):209-213 |
| 镁合金电化学转化膜的组成及反应机理 |
| Constituents and Reaction Mechanism of Electrochemical Conversion Coating on Magnesium Alloys |
| 投稿时间：2018-02-04 修订日期：2018-07-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.07.030 |
| 中文关键词: 镁合金 电化学磷化 转化膜 反应机理 |
| 英文关键词:magnesium alloys electrochemical phosphating conversion coating reaction mechanism |
| 基金项目:辽宁省自然科学基金项目(201602648) |
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| 中文摘要: |
| 目的 更好地开展镁合金防腐蚀研究，提高其耐蚀性。方法 利用电化学法制备镁合金磷化膜，通过单因素条件实验研究电流密度、温度以及时间对反应过程的影响，得出制备最佳方案。通过X荧光光谱仪（EDX）、X射线衍射仪（XRD）及电化学测试等现代检测技术对镁合金电化学膜微观结构、沉积速率等进行测试，得出制备的转化膜组成成分的定性及半定量分析结果，以此推断镁合金电化学转化膜的生成机理。结果 电化学法制备镁合金磷化膜的最佳工艺条件为：电流密度0.5 A/dm2，温度30 ℃，反应时间5 min。EDX分析结果显示，磷化膜主要成分为Mg、P、Zn，其质量分数分别为11.017%、2.105%、28.534%。 结论 电化学转化膜的主要化学成分为Mg、P、Zn，还有少量其他成分，如Al、S、Ca、Mn、Ni、Cu。腐蚀机理复杂，不确定性较大。镁合金磷化膜主要由结晶型磷化锌、磷化铝、锌镁金属磷化夹杂物和单质Zn组成，并且还有少量的其他化合物。 |
| 英文摘要: |
| The work aims to study anti-corrosion of magnesium alloy and improve its corrosion resistance. Phosphate coating on magnesium alloy was developed in electrochemical method. Single factor experiment was carried out to study the effects of current density, temperature and time on reaction process, and the best preparation scheme was obtained. Parameters including microstructure and deposition rate of the electrochemical coating on magnesium alloy were tested by means of such modern measurement techniques as X-ray fluorescence spectrometer (EDX), X-ray diffractometer (XRD) and electrochemical test, qualitative and semi-quantitative analysis results of the conversion coating constituents were obtained, and generation mechanism of electrochemical conversion coating on magnesium alloy was deduced. The optimum conditions for preparation of phosphate coating on magnesium alloy in electrochemical method were as follows: current density of 0.5 A/dm2, temperature of 30 ℃ and reaction time of 5 min. EDX analysis showed that main constituents of the electrochemical conversion coating were Mg, P, Zn, corresponding mass fraction was 11.017%, 2.105%, 28.534%, respectively. The phosphate coating consists of main constituents including Mg, P, Zn, and minor constituents such as Al, S, Ca, Mn, Ni, Cu. Corrosion mechanism is complex and uncertain. The phosphate coating of magnesium alloy mainly consists of Zn3(PO4)2•4H2O, AlPO4, MgZn2(PO4)2 and Zn, there is a small amount of other compounds as well. |
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