Ji Gangqiang, Ma Longfei, Zhang Sunan, Zhang Juan, Wu Liyun
Engineering Training Center, Taiyuan Institute of Technology, Taiyuan 030008, China.
Northern Shanxi Machinery Manufacturing Limited Liability Company, Taiyuan 030009, China.
Materials (Basel). 2025 Mar 16;18(6):1307. doi: 10.3390/ma18061307.
Electrolytic plasma polishing technology is widely used in medical devices, aerospace, nuclear industry, marine engineering, and other equipment manufacturing fields, owing to its advantages of shape adaptability, high efficiency, good precision, environmental protection, and non-contact polishing. However, the lack of in-depth research on the material removal mechanism of the electrolytic plasma polishing process severely restricts the regulation of the process parameters and polishing effect, leading to optimization and improvement by experimental methods. Firstly, the formation mechanism of passivation film was revealed based on an analysis of the surface morphology and chemical composition of stainless steel. Subsequently, the dissolution mechanism of the passivation film was proposed by analyzing the change in the valence state of the main metal elements on the surface. In addition, the surface enclosure leveling mechanism of electrolytic plasma polishing (EPP) for stainless steel was proposed based on a material removal mechanism model combined with experimental test methods. The results show that EPP significantly reduces the surface roughness of stainless steel, with Ra being reduced from 0.445 µm to 0.070 µm. Metal elements on the anode surface undergo electrochemical oxidation reactions with reactive substances generated by the gas layer discharge, resulting in the formation of passivation layers of metal oxides and hydroxides. The passivation layer complexes with solvent molecules in the energetic plasma state of the gas layer with SO ions, forming complexes that enter the electrolyte. The dynamic balance between the formation and dissolution of the passivation film is the key to achieving a flat surface. This study provides theoretical guidance and technical support for the EPP of stainless steel.
电解等离子体抛光技术因其形状适应性强、效率高、精度好、环保以及非接触式抛光等优点，在医疗器械、航空航天、核工业、海洋工程等装备制造领域得到广泛应用。然而，对电解等离子体抛光过程中材料去除机理缺乏深入研究，严重制约了工艺参数的调控和抛光效果，导致只能通过实验方法进行优化和改进。首先，通过分析不锈钢的表面形貌和化学成分，揭示了钝化膜的形成机理。随后，通过分析表面主要金属元素价态的变化，提出了钝化膜的溶解机理。此外，基于材料去除机理模型并结合实验测试方法，提出了不锈钢电解等离子体抛光（EPP）的表面包络整平机理。结果表明，EPP显著降低了不锈钢的表面粗糙度，Ra从0.445 µm降至0.070 µm。阳极表面的金属元素与气层放电产生的活性物质发生电化学氧化反应，形成金属氧化物和氢氧化物的钝化层。钝化层与气层高能等离子体状态下的溶剂分子以及SO离子形成络合物，这些络合物进入电解液。钝化膜形成与溶解之间的动态平衡是实现表面平整的关键。本研究为不锈钢的EPP提供了理论指导和技术支持。
