微弧氧化高低频耦合脉冲对TiO_(2)膜层组织和性能的影响  

Effect of High and Low-Frequency Coupled Pulse of Micro-arc Oxidation on Microstructure and Properties of TiO_(2)Coatings

作　　者：郭豫鹏 李鑫 潘墨儒 陆晓峰[1] 蔚振国 朱晓磊[1] Guo Yupeng;Li Xin;Pan Moru;Lu Xiaofeng;Wei Zhenguo;Zhu Xiaolei(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816

出　　处：《稀有金属材料与工程》2024年第11期3233-3240,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金面上项目(11772147)。

摘　　要：通过微弧氧化脉冲形式的创新提高制备膜层的性能,采用微弧氧化高低频耦合脉冲制备TiO_(2)膜层。结果表明:低压、高频脉冲促使电解液中负离子团高速附着至阳极,有效提高膜层防腐性能。膜层表面微孔数量减小,膜层孔隙率由2.72%降低至0.896%,膜层厚度增加至23.76μm,Ti元素含量由30.02%增加到42.48%,纳米颗粒悬浊液中施加高频脉冲Nb元素含量增加至10.62%。膜层由锐钛矿型TiO_(2)、金红石型TiO_(2)、Al2TiO5、Nb_(2)O_(5)及Nb-Ti化合物组成,高频作用下Nb峰值显著增加。腐蚀电流密度由7.995×10^(-7) A/cm^(2)降低至3.249×10^(-7) A/cm^(2)。悬浊液中高频脉冲促进纳米颗粒沉积至膜层,低压、高频产生的加速电磁场,促使负离子团向阳极沉积,提高了膜层性能。The innovation in preparation method of micro-arc oxidation coupled with pulse was proposed to improve coating properties.The TiO_(2)coatings were prepared by micro-arc oxidation coupled with high and low-frequency pulse.Results show that the low-voltage and high-frequency pulse promotes the electrodeposition of nano-particles and effectively improves the anticorrosion performance of the coatings.The number of micropores on the surface of the coatings decreases,the porosity decreases from 2.72%to 0.896%,the thickness increases to 23.76μm,and the Ti content increases from 30.02%to 42.48%.The high-frequency pulse was applied to the nanoparticle suspension,and the content of Nb increases to 10.62%.The coatings are comprised of anatase-TiO_(2),rutile-TiO_(2),Al2TiO5,Nb_(2)O_(5),and Nb-Ti compounds.The Nb peak value increases significantly under the high-frequency pulse.The corrosion current density decreases from 7.995×10^(-7) A/cm^(2)to 3.249×10^(-7) A/cm^(2).The high-frequency pulse accelerates the deposition of nanoparticles into the coatings,and the low-voltage and high-frequency electromagnetic field accelerates the deposition of particles into the positive electrode electrophoresis,thus enhancing the performance of the coatings.

关 键 词：微弧氧化 高低频耦合脉冲 电泳沉积 TiO_(2) 

分 类 号：TB43[一般工业技术]