程昱琳,程英亮.非阀金属的等离子体电解氧化研究进展[J].表面技术,2023,52(6):24-40.
CHENG Yu-lin,CHENG Ying-liang.Advance in Plasma Electrolytic Oxidation on Non-valve Metals[J].Surface Technology,2023,52(6):24-40 |
| 非阀金属的等离子体电解氧化研究进展 |
| Advance in Plasma Electrolytic Oxidation on Non-valve Metals |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.06.003 |
| 中文关键词: 等离子体电解氧化 非阀金属 碳钢 铜及其合金 锌及其合金 |
| 英文关键词:plasma electrolytic oxidation (PEO) non-valve metals carbon steel copper and its alloys zinc and its alloys |
| 基金项目:国家自然科学基金项目(51671084) |
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| 中文摘要: |
| 等离子体电解氧化技术通常用于Al、Mg、Ti等阀金属表面形成高性能陶瓷层，较少涉及非阀金属。主要介绍了碳钢、铜、锌及其合金等“非阀金属”的等离子体电解氧化技术的最新进展。列举了碳钢在不同的电解液成分、电参数、氧化时间等工艺参数条件下制备所得涂层的相关性能，阐述了碳钢在等离子体电解氧化过程中绝缘膜击穿优于气膜击穿的成膜理论。分析了铜及其合金在硅酸盐、铝酸盐、磷酸盐及其混合电解液中的等离子体电解氧化行为，并探究了涂层的耐腐蚀和耐摩擦性能及形成机理。阐述了在不同的工艺参数下锌及其合金在耐腐蚀、耐摩擦、气敏传感和生物降解性的研究，并且论述了阀金属与非阀金属成膜的差异所在。最后，对非阀金属等离子体电解氧化技术后续的发展进行了展望。 |
| 英文摘要: |
| Plasma electrolytic oxidation (PEO), also known as micro arc oxidation (MAO), is a surface modification technology for the in-situ growth of high-performance ceramic coatings with strong adhesion on the surface of valve metals (Al, Mg, Ti, Zr, etc.). It can process workpieces of any shape and has high production efficiency, so it is widely used in marine, aviation, military, chemical and other fields. However, for the so-called non-valve metals, such as carbon steel, copper, brass, zinc and their alloys, it is difficult to establish a high-resistance insulating film on the metal and form a stable arc plasma discharge state during the PEO process, resulting in high energy consumption, low coating formation efficiency and weak adhesion between coating and substrate. As a result, PEO technology is generally considered not suitable for carbon steel, copper, brass, zinc and their alloys. As those non-valve metals are also important in modern civilization and industry, the incapability to treat the non-valve metals is regarded as one of the major disadvantages of the PEO technology. In recent years, some scholars have tried to prepare a layer of aluminum on the non-valve metal surface through magnetron sputtering, plasma spraying, thermal spraying, and other spraying techniques, and then performed PEO treatment on the sample. However, this method is the PEO of the valve metal (aluminum) rather than the non-valve metals. The direct modification of the surface of non-valve metals by PEO is still challenging and highly desirable to prepare multifunctional coatings to improve their friction and corrosion resistance, thermal shock resistance, catalysis and other properties, finally benefit to expand its application fields. Fortunately, in recent years, domestic and foreign researchers have made some progresses in the PEO treatment of non-valve metals. The scope of their research has expanded from the initial carbon steel to brass and zinc and other non-valve metals, and even PEO of the non-metallic silicon. This paper mainly introduces the latest progress in PEO treatment of non-valve metals such as carbon steel, copper, zinc and their alloys. Firstly, the properties of PEO coatings on carbon steel prepared under different processing parameters such as electrolyte composition, electrical parameters, and oxidation time are listed. In addition, it is also described that in the process of PEO of carbon steel, the mechanism of the dielectric breakdown of insulating film may be superior to the theory that the breakdown of gas vapour occurs first to form a coating. Then, the PEO behaviors of copper and its alloys in silicate, aluminate, phosphate and their mixture electrolytes are analyzed, and the corrosion resistance, wear resistance and formation mechanism of the coating are studied. The corrosion resistance, wear resistance, gas sensitivity and biodegradation properties of zinc and its alloys under different process parameters are also discussed. The difference between the PEO coating formation mechanisms for valve metals and non-valve metals has also been discussed. Finally, based on the current status of the PEO technology for non-valve metals, the future development in the PEO treatment of non-valve metals is predicted in terms of the optimization of processing parameters, the expansion of applicable metal substrates, improvement in coating quality, and coating formation mechanisms. |
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