杨登科,马颖,安凌云,张睿峰,吴雄飞,孙乐,王占营.基于配方均匀试验优化微弧氧化电解液浓度配比[J].表面技术,2021,50(3):338-347.
YANG Deng-ke,MA Ying,AN Ling-yun,ZHANG Rui-feng,WU Xiong-fei,SUN Le,WANG Zhan-ying.Optimizing Electrolyte Formulas for Micro-arc Oxidation Based on Uniform Formula Experimental Design[J].Surface Technology,2021,50(3):338-347 |
| 基于配方均匀试验优化微弧氧化电解液浓度配比 |
| Optimizing Electrolyte Formulas for Micro-arc Oxidation Based on Uniform Formula Experimental Design |
| 投稿时间：2020-06-17 修订日期：2020-07-24 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.03.037 |
| 中文关键词: 镁合金 微弧氧化 配方均匀试验 电解液 微观组织 耐蚀性 |
| 英文关键词:magnesium alloy micro-arc oxidation uniform formula experiment electrolyte microstructure corrosion resistance |
| 基金项目:甘肃省创新研究群体计划(1111RJDA011) |
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| Author | Institution |
| YANG Deng-ke | 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 |
| AN Ling-yun | State Key Laboratory of advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
| ZHANG Rui-feng | 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 |
| 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 |
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| 中文摘要: |
| 目的 研究电解液中各电解质不同浓度配比下微弧氧化膜层的制备、微观结构及耐蚀性能，以确定最优配方。方法 基于配方均匀试验方法，在硅酸盐系电解液中对AM60B镁合金进行微弧氧化处理。引入微弧氧化反应的可行性和微弧氧化膜层的成膜性两个试验指标，分别评判本研究中某电解液配方是否具有实际应用价值，以及评价在某个电解液配方下所制得膜层的合格程度。利用涡流测厚仪、扫描电镜(SEM)、X射线衍射(XRD)、电子探针(EPMA)、硝酸点滴实验以及电化学实验等方法，分别表征膜层的厚度、微观结构、物相组成、元素成分及耐蚀性能。结果 当电解液中NaOH的质量浓度小于10 g/L时，方能获得表观完整且色泽均匀的微弧氧化膜层。当NaOH和KF的浓度配比接近，且两者之和约为Na2SiO3所占配比时，即Na2SiO3为19.24 g/L、NaOH为8.80 g/L、KF为11.96 g/L时，膜层中孔径的尺寸小，缺陷少，致密度最高，此时膜层的耐蚀性最好，与基体相比，该膜层的硝酸点滴耐蚀性提高了39倍，电化学耐蚀性提高了3个数量级。膜层主要由MgO、Mg2SiO4及少量的MgF2、MgAl2O4组成，但含量有差别。结论 实验设计方法的选择是保证本研究结果有效性的核心和关键。电解液中NaOH的浓度高低是决定某电解液配方是否具有实用价值的首要因素。只有Na2SiO3、NaOH和KF三者间具备适当的配比时，才能降低膜层中的微孔尺寸，减少微裂纹，提高其致密度，并能够在膜层中沉积更多的优质物相，这些是增强膜层耐蚀性的前提和保障。 |
| 英文摘要: |
| In an effort to finalize the optimal formula, the research work was conducted to probe into the preparation, their microstructures and corrosion resistances of micro-arc oxidation (MAO) coatings under different concentration ratios of electrolytes. Based on uniform formula experimental design, AM60B magnesium alloys underwent micro-arc oxidation treatment in silicate-containing electrolyte solution. The two response indexes, micro-arc oxidation feasibility and formability of micro-arc oxidation coating, were designated to verify if the formula for a certain electrolyte solution involved in the paper had practical application potential and evaluate if the coating made under a certain electrolyte solution formula was acceptable. Eddy current thickness gauge, scanning electron microscope (SEM), X-ray diffraction (XRD), electron-probe micro analyzer(EPMA), spotting test and electrochemical test were employed to characterize the thickness, microstructure, phase composition, element composition and corrosion resistance of the coatings, respectively. The results have shown that where the NaOH concentration in the electrolyte solution was less than10 g/L, complete and evenly-colored MAO coating could be prepared. And where NaOH and KF shared almost the same concentration ratio and the sum of the both approximated Na2SiO3 ratio, namely Na2SiO3 was 19.24 g/L, NaOH 8.80 g/L and KF 11.96 g/L, the coating possessed attribute of small micropore size, less defect and great compactness. At this point, the coating performed the best in corrosion resistance. Compared with the matrix, spotting corrosion resistance of the coating was improved by 39 times and its electrochemical corrosion resistance was improved by 3 magnitudes. The coatings in the paper mainly comprised MgO, Mg2SiO4 and a small amount of MgF2 and MgAl2O4, varying with each other in content. The choice of experimental designing is key to validity of the research results. The concentration of NaOH in electrolyte solution is of crucial importance to the practicability of a certain formula for electrolyte solution. Only when the ratio between Na2SiO3, NaOH and KF is reasonable is it possible to minimize micropore size, reduce micro-crack, improve compactness of coatings, and deposit more excellent phase in coatings. They all come as prerequisite and guarantee to enhanced coating corrosion resistance. |
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