Pr(NO(3))_(3)掺杂对TC4微弧氧化涂层微观形貌与耐腐蚀性的影响  

Influence of Pr(NO_(3))_(3) doping on the microstructure and corrosion resistance of TC4 micro-arc oxidation coating

作　　者：张红涛 王铁成 张云龙 张海峰 韩玉坤 Zhang Hongtao;Wang Tiecheng;Zhang Yunlong;Zhang Haifeng;Han Yukun(Flight Academy,Anyang Institute of Technology,Anyang 455000,China)

机构地区：[1]安阳工学院飞行学院,河南安阳455000

出　　处：《轻金属》2024年第6期30-34,共5页Light Metals

基　　金：河南省重点研发项目(221111321000);河南省高等学校重点科研项目计划(22B630001);安阳工学院博士科研启动基金项目(BSJ2021028,BSJ2017004);安阳市科技计划项目(2021C01GX005);安阳工学院青年骨干教师培养计划研究项目(稀土掺杂CNT/SiC/Cu基电接触材料的导热行为研究)。

摘　　要：钛合金因其良好的高比强度、机械性能等特点,已成为临床领域应用最为广泛的植入体材料。但钛合金属于生物惰性材料,与骨组织结合能力较弱,需经适当的改性处理赋予其表面活化性能,提高其与骨的结合强度,缩短愈合周期。因此,在钛合金表面制造出具有生物活性的涂层,成为钛合金临床应用的关键技术问题。针对TC4合金的生物惰性和耐腐蚀性差等问题,本文尝试利用微弧氧化技术在TC4合金表面合成出掺杂羟基磷灰石(HAp)的TiO_(2)复合涂层,在钙磷盐电解液体系中引入Pr(NO(3))_(3),重点研究Pr(NO(3))_(3)掺杂量对TC4微弧氧化涂层的物相组成、表面形貌、表面粗糙度、接触角、电化学极化曲线等参数的影响。研究结果表明:通过微弧氧化技术能够在TC4合金表面直接合成出含有羟基磷灰石(HAp)的TiO_(2)复合涂层。随着电解液中Pr(NO(3))_(3)掺杂量增加,涂层中金红石相TiO_(2)和羟基磷灰石相含量增加。掺Pr涂层的表面粗糙度和接触角呈现出先降低后增加的趋势。与未掺杂Pr(NO(3))_(3)试样相比,掺Pr涂层的腐蚀电流密度有所降低。当Pr(NO(3))_(3)掺杂量达到0.009mol/L时,涂层腐蚀电流密度数值最低,约为182.54nA/cm2,耐蚀性最佳。Titanium alloy has become the most widely used implant material in clinical field due to its high specific strength and mechanical properties.However,titanium alloy,as a bioinert material,has relatively weak binding ability of bone tissue,so it needs to be properly modified to provide its surface activation properties and improve its binding strength with bone,then it would shorten the healing cycle.Therefore,the production of bioactive coatings on the surface of titanium alloy has become a key technical problem for the clinical application of titanium alloy.Aiming at the problems of biological inertness and poor corrosion resistance of TC4 alloy,this paper attempted to apply micro-arc oxidation technology to synthesize TiO_(2)composite coating doped with hydroxyapatite(HAp)on the surface of TC4 alloy,so Pr(NO_(3))_(3)was introduced into the electrolytic liquid system of calcium and phosphorus salts.The influence of Pr(NO_(3))_(3)doping amount on the phase composition,surface morphology,surface roughness,contact angle and electrochemical polarization curve of TC4 micro-arc oxidation coating was investigated.The research results showed that TiO_(2)composite coatings containing hydroxyapatite(HAp)can be directly synthesized on the surface of TC4 alloy by micro-arc oxidation technology.With the increase of Pr(NO_(3))_(3)doping amount in the electrolytic liquid,the content of rutile phase TiO_(2)and hydroxyapatite phase in the coating increased.The surface roughness and contact angle of the Pr-doped coating showed a trend of decreasing first and then increasing.Compared with the undoped Pr(NO_(3))_(3)specimen,the corrosion current density of Pr-doped coating decreased.When the doping amount of Pr(NO_(3))_(3)reached 0.009 mol/L,the corrosion current density of the coating was the lowest,which was about 182.54 nA/cm^(2),so the corrosion resistance was the best.

关 键 词：微弧氧化 TC4合金 羟基磷灰石 TIO2涂层 

分 类 号：TF823[冶金工程—有色金属冶金] TG146.2[一般工业技术—材料科学与工程]