| ZHANG Xiang,ZHOU Liang,JIA Hong-yao,FENG Yan-rong,ZHAO Li-bin,FANG Da-qing.Research Progress on Performance Optimization of Micro-arc Oxidation Films on Magnesium Alloys[J],52(3):122-133 |
| Research Progress on Performance Optimization of Micro-arc Oxidation Films on Magnesium Alloys |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.009 |
| KeyWord:magnesium alloy micro-arc oxidation corrosion resistance wear resistance biological properties |
| Author | Institution |
| ZHANG Xiang |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| ZHOU Liang |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| JIA Hong-yao |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| FENG Yan-rong |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| ZHAO Li-bin |
Shanxi Yinguang Huasheng Magnesium Co., Ltd., Shanxi Wenxi, , China |
| FANG Da-qing |
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an , China |
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| Abstract: |
| Magnesium alloy is an important engineering material with many excellent physical and chemical properties, which has broad application prospects in the fields of aerospace, transportation, electronic communications, biomedicine, energy, etc. However, the application of magnesium alloy is limited by its high chemical activity, so surface treatment is required to avoid corrosion. Micro-arc oxidation (MAO) leads the working area from the Faraday area to the high-voltage discharge area, which overcomes the defects of anodic oxidation and greatly improves the overall properties of magnesium alloys. Based on the research status in China and abroad, the effects of electrolyte, particle additives and electrical parameters (current mode, voltage, current density, duty cycle, frequency and oxidation time) on the corrosion resistance, wear resistance and biological properties of the films were introduced emphatically. Then, key issues such as regulation orientation, ceramic film toughening, performance matching optimization and energy utilization were proposed. In addition, the solutions adopted by the researchers to the above problems were discussed, and the rationality was analyzed accordingly. Finally, in view of the existing problems, the future development of MAO technology of magnesium alloys was discussed. MAO films are known for higher thickness, dense structure and ceramic phase, which usually shows excellent corrosion resistance and wear resistance compared to other types of films. However, due to the film-forming characteristics of MAO process, there is inevitably a certain porosity in the ceramic films. To increase film density, researchers have explored the use of nanoparticles in the electrolyte, which can be deposited onto the film by electrophoretic adsorption or electromigration under a strong electric field. In fact, ceramic films can be brittle and prone to fatigue and peel off during wear. To address this issue, increasing the toughness can enhance the energy absorption capacity of the films and prevent the rapid crack propagation. At present, there has been little research on the toughening of magnesium alloy ceramic films, which can be deepened in the future. Studies were also made to introduce a lubricating phase, such as graphite, to enhance anti-friction performance of the films. It has been found that the single factor experiment may not accurately capture the influence of process parameters on films, which is due to the interaction between variables. Therefore, the relationship between the process parameters and the film properties is nonlinear, and when a certain critical value is exceeded, the film properties will deteriorate. In addition, magnesium alloys are commonly used in biological applications, where there are also checks and balances between biological properties, such as degradation rates and bacterial inhibition. Therefore, optimizing the matching between properties is key to improving the overall performance of the films. Due to the complexity of MAO process, there is no complete explanation of the film formation mechanism. Thus, basic research should be further strengthened to explore the thermodynamics and kinetics of film formation. In recent years, the research direction tends to solidify, and there is little research with substantial innovation. Therefore, it is urgent to establish a richer and more scientific research system on the basis of the previous work. Last but not least, energy consumption is also an important factor that can hardly be ignored in future industrialization. Reducing energy consumption without sacrificing the quality of the film will both reduce costs and uphold the concept of sustainable development. |
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