张睿峰,马颖,孙乐,王占营,吴雄飞,高唯.频率、占空比及其交互作用对镁合金微弧氧化膜层结构和耐蚀性的影响[J].表面技术,2021,50(1):375-382, 412.
ZHANG Rui-feng,MA Ying,SUN Le,WANG Zhan-ying,WU Xiong-fei,GAO Wei.Effect of Frequency, Duty Ratio and Their Interaction on Structure and Corrosion Resistance of Micro-arc Oxidation Coatings Formed on Magnesium Alloys[J].Surface Technology,2021,50(1):375-382, 412 |
| 频率、占空比及其交互作用对镁合金微弧氧化膜层结构和耐蚀性的影响 |
| Effect of Frequency, Duty Ratio and Their Interaction on Structure and Corrosion Resistance of Micro-arc Oxidation Coatings Formed on Magnesium Alloys |
| 投稿时间：2020-04-18 修订日期：2020-12-11 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.01.034 |
| 中文关键词: AM60B镁合金 微弧氧化 频率 占空比 交互作用 耐蚀性 |
| 英文关键词:AM60B magnesium alloy micro-arc oxidation frequency duty ratio interaction corrosion resistance |
| 基金项目:甘肃省创新研究群体计划(1111RJDA011) |
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| Author | Institution |
| ZHANG Rui-feng | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| MA Ying | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| SUN Le | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| WANG Zhan-ying | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| WU Xiong-fei | State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| GAO Wei | Faculty of Engineering, the University of Auckland, Auckland 1142, New Zealand |
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| 中文摘要: |
| 目的 对频率、占空比及其交互作用对微弧氧化膜层性能的影响，既进行定性探究，又进行定量分析。方法 采用正交试验方法，在已优化的硅酸盐体系中，以AM60B镁合金为基体制备微弧氧化膜层。通过正交试验极差分析与方差分析，得到频率、占空比及其交互作用对膜层性能影响的主次顺序和最佳因素水平搭配，以及它们对膜层性能影响的显著性。采用数字式涡流测厚仪、SEM和XRD分别表征微弧氧化膜层的厚度、微观形貌与物相。以点滴试验与动电位极化曲线测试膜层的耐蚀性。结果 占空比对膜层性能的影响大于频率，且占空比对膜层的厚度、点滴耐蚀性和电化学耐蚀性有非常显著的影响。频率和占空比之间的交互作用对膜层厚度、点滴耐蚀性有显著性影响，对电化学耐蚀性有着非常显著的影响。频率为1800 Hz、占空比为40%时，膜层的点滴耐蚀性最佳;频率为1800 Hz、占空比为20%时，膜层的电化学耐蚀性最好。结论 随着占空比增大，膜层厚度增大，点滴耐蚀性更好;随着频率的提高，膜层的孔隙率更小、致密性更好，电化学耐蚀性显著得到提升。频率与占空比不仅会单独影响膜层的性能，它们之间的交互作用对膜层更有着不可忽视的影响。筛选出的最佳配方也为将来的进一步优化指明了方向。 |
| 英文摘要: |
| To investigate the influence of frequency, duty ratio and their interaction on the property of micro-arc oxidation (MAO) coatings qualitatively as well as quantitatively, the MAO coatings on AM60B magnesium alloys in the optimized silicate electrolyte based on orthogonal experiments, investigates the priority of the influence of frequency, duty ratio and their interaction on the performance of MAO coatings, the optimal combination of factors and levels, as well as the significance of their effects on the coatings’ performance with the range analysis and variance analysis based on orthogonal experiments, examines the thickness, microstructures and phase compositions of MAO coatings by using digital eddy current thickness gauge, SEM and XRD, respectively, tests the corrosion resistances of MAO coatings by spotting corrosion test and dynamic potential polarization curve test. The results have shown that the influence of duty ratio on the performance of MAO coatings is greater than that of frequency, and the influence of duty ratio on coatings’ thickness, spotting corrosion resistance and electrochemical corrosion resistance is remarkably significant. The influence of the interaction between frequency and duty ratio is significant on the thickness and spotting corrosion resistance of MAO coatings, especially on the coatings’ electrochemical corrosion resistance. The MAO coatings with best spotting corrosion resistance were fabricated with frequency 1800 Hz and duty ratio 40%. While the MAO coatings prepared under the condition of frequency 1800 Hz and duty ratio 20% exhibit the most excellent electrochemical corrosion resistance. Therefore, with the increasing of duty ratio, the greater the coating thickness, the better the spotting corrosion resistance. With the increasing of frequency, the smaller of the surface porosity of MAO coatings, the better the compactness of the coatings and the electrochemical corrosion resistance. Not only the frequency and duty ratio affect the coatings’ performance respectively, but also the interaction between them demonstrates a considerable influence on it. The optimized scheme extracted from this research provides the guideline for further optimization. |
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