钛合金微弧氧化涂层等离子体电解去除工艺与作用机制  

Process and Mechanism of Removing Micro-Arc Oxidation Coating on Titanium Alloy by Plasma Electrolysis

作　　者：邹永纯 王树棋[1] 王亚明 陈国梁[1] 张凯伟 欧阳家虎 贾德昌[1] 周玉[1] ZOU Yongchun;WANG Shuqi;WANG Yaming;CHEN Guoliang;ZHANG Kaiwei;OUYANG Jiahu;JIA Dechang;ZHOU Yu(Institute for Advanced Ceramics,Harbin Institute of Technology,Harbin 150001,China;Center of Analysis Measurement and Computing,Harbin Institute of Technology,Harbin 150008,China)

机构地区：[1]哈尔滨工业大学特种陶瓷研究所,黑龙江哈尔滨150001 [2]哈尔滨工业大学分析测试与计算中心,黑龙江哈尔滨150008

出　　处：《材料保护》2023年第7期25-30,共6页Materials Protection

摘　　要：微弧氧化涂层在制备及服役过程中出现生长不均匀或表面磨损剥落现象,需将其去除以达到二次制备再利用的目的。针对高结合强度微弧氧化涂层难去除的瓶颈问题,提出了一种等离子体电解涂层去除(Plasma Electrolytic Removal, PER)新技术。对比分析不同电压下涂层去除速率、厚度变化及不同时间下涂层去除后微观形貌发现,当施加电压260 V时,涂层去除效率最低,经过11 min后涂层全部去除;当电压升至320 V时,涂层全部去除仅需6 min,这归因于大的施加电压,更容易产生多且稳定的等离子体放电通道,实现微弧氧化涂层快速去除;基于此进一步提出了等离子体电解涂层去除的剥离、减薄与溶解协同作用机制。该工艺去除效率高、绿色环保,在航空航天、医疗器械等领域具有广阔的应用前景。During the preparation and service process of micro-arc oxidation coatings,phenomena such as uneven growth or surface wear and peeling emerged,so the micro-arc oxidation coatings should be removed to achieve the purpose of secondary preparation and reuse.Aiming at the bottleneck problem of difficulty to remove micro-arc oxidation coating with high bonding strength,a novel plasma electrolytic removal(PER)technique was presented in this work.By comparing and analyzing the coating removal rates at different voltages,thickness change,and microstructure after coating removal at different times,it was found that the coating removal efficiency was the lowest with the applied volt-age of 260 V,and the coating was completely removed after 11 min.When the voltage was increased to 320 V,the coating was completely re-moved in only 6 min.This was due to the large applied voltage,which made it easier to generate multiple and stable plasma discharge chan-nels,thus realizing rapid removal of micro-arc oxidation coating.Furthermore,a synergistic mechanism of peeling,thinning,and dissolution in the removal of coatings by plasma electrolysis was proposed.The PER technique exhibits high efficiency and environmental protection,which has broad application prospects in the fields of aerospace,medical instruments and so on.

关 键 词：等离子体电解 涂层去除 微弧氧化 钛合金 

分 类 号：TG174.451[金属学及工艺—金属表面处理]