掺入纳米CeO_(2)颗粒对Ti6Al4V的微弧氧化涂层性能的影响  

Influence of Incorporation of Nanometer CeO_(2) Particles on Properties of Ti6Al4V Micro-Arc Oxidation Coating

作　　者：马国峰[1,2] 赵小荣 关振声 战秀峰 蒙雯 MA Guofeng;ZHAO Xiaorong;GUAN Zhensheng;ZHAN Xiufeng;MENG Wen(School of Mechanical Engineering,Shenyang University,Shenyang 110044,China;Institute of Science and Technology Innovation,Shenyang University,Shenyang 110044,China)

机构地区：[1]沈阳大学机械工程学院,辽宁沈阳110044 [2]沈阳大学科技创新研究院,辽宁沈阳110044

出　　处：《沈阳大学学报（自然科学版）》2023年第5期363-371,共9页Journal of Shenyang University：Natural Science

基　　金：辽宁高等学校创新人才支持计划(2020-42);沈阳市科技攻关项目(20-202-1-12)。

摘　　要：采用脉冲电源在磷酸盐和硅酸盐等复合电解液下对Ti6Al4V钛合金进行表面陶瓷化处理,并研究在电解液中掺杂不同质量浓度CeO_(2)颗粒制备出的陶瓷涂层性能的变化,确定最佳掺杂浓度。应用XRD、SEM和EDS等手段表征了MAO涂层的物相组成、表面形貌和元素组成,并对比分析了CeO_(2)颗粒掺杂前后的厚度变化和电化学腐蚀行为。制备出的MAO陶瓷涂层具有复杂的多相复合结构,主要以金红石TiO_(2)和锐钛矿TiO_(2)为主,含有部分Al_(2)TiO_(5)和SiO_(2)相,另外还含有晶态的Al2O3和少量非晶态Al2O3;在电参数、反应时间和电解液温度不变的条件下,在电解液中掺杂CeO_(2)能轻微提高MAO涂层的厚度,并改变各相之间的转化率,提高氧化膜的耐蚀性。随着掺杂质量浓度的提高,膜层的光滑度先提高后降低,膜厚逐渐增加,耐蚀性先提高后降低;掺杂质量浓度为1.00 g·L^(-1)时平均膜厚达到12.02μm,涂层表面最光滑,涂层的致密性最好,致密层电阻Rb大大提高,此时的腐蚀速率最低为0.79μm·a^(-1),耐蚀性最好。The surface ceramic treatment of Ti6Al4V titanium alloy was carried out using a pulse power supply in a composite electrolyte of phosphate and silicate,and the changes in the performance of ceramic coatings prepared by doping different mass concentrations of CeO_(2) particles in the electrolyte were studied to determine the optimal doping concentration.XRD,SEM,and EDS were used to characterize the phase composition,surface morphology,and elemental composition of MAO coatings.The thickness changes and electrochemical corrosion behavior of CeO_(2) particles before and after doping were compared and analyzed.The prepared MAO ceramic coating has a complex multiphase composite structure,mainly composed of rutile TiO_(2) and anatase TiO_(2),containing some Al_(2)TiO_(5) and SiO_(2) phases,as well as crystalline Al 2O 3 and a small amount of amorphous Al 2O 3;Under the conditions of constant electrical parameters,reaction time,and electrolyte temperature,doping CeO_(2) into the electrolyte can slightly increase the thickness of the MAO coating and change the conversion rate between phases,thereby improving the corrosion resistance of the oxide film.As the doping concentration increases,the smoothness of the film layer first increases and then decreases.The film thickness continues to increase.The corrosion resistance first increases and then decreases.When the doping concentration is 1.00 g·L^(-1),the average film thickness reaches 12.02μm.The surface of the coating is also the smoothest,and the density of the coating is the best.The resistance R b of the dense layer has increased by an order of magnitude,and the corrosion rate at this time is the lowest at 0.79μm·a^(-1),with the best corrosion resistance.

关 键 词：TI6AL4V钛合金 微弧氧化 复合电解液 纳米CeO_(2)颗粒 电化学腐蚀行为 

分 类 号：TG174.453[金属学及工艺—金属表面处理]