Effect of SiO_(2) Nanoparticles/Silicate on Characteristics of Micro-arc Oxidation Coating Formed on TC4 Alloy  

SiO_(2)纳米颗粒/硅酸盐对TC4钛合金微弧氧化膜层性能的影响

作　　者：Sun Fengyu Yang Zhao Hu Jie Gong Yunbai Wang Ping Luo Qiming Zhu Manlan 孙枫宇;杨钊;胡杰;龚云柏;王平;罗启铭;朱满兰(西南石油大学新能源与材料学院,四川成都610500;低碳智能燃煤发电与超净排放全国重点实验室,江苏南京210046)

机构地区：[1]School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China [2]State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission,Nanjing 210046,China

出　　处：《稀有金属材料与工程》2025年第1期76-83,共8页Rare Metal Materials and Engineering

基　　金：Sichuan Science and Technology Program(2022YFSY0018)。

摘　　要：TC4 micro-arc oxidation(MAO)coatings were prepared by adding SiO_(2) nanoparticles or sodium silicate to the sodium meta-aluminate-based electrolyte.The effect of additives was investigated by XRD,SEM,EDS,electrochemical and wear tests.The results show that additives can considerably accelerate the formation of MAO coatings.The coatings are mostly composed of rutile and anatase TiO_(2),α-Al_(2)O_(3),γ-Al_(2)O_(3),Al_(2)TiO_(5) and SiO_(2).Sodium silicate and SiO_(2) nanoparticles added to the coating can effectively reduce the size of micropores and increase its thickness,whereas SiO_(2) nanoparticles with superior physical properties can be directly deposited at the discharge channel,significantly increasing the coating's resistance to wear and corrosion.The coating with SiO_(2) nanoparticles exhibits the best overall performance,with the lowest corrosion rate and average friction coefficient of 4.095×10^(-5)mm/a and 0.30,respectively.通过向偏铝酸钠基础电解液中加入SiO_(2)纳米颗粒或硅酸钠制备了TC4钛合金微弧氧化膜。使用XRD、SEM、EDS、电化学工作站和摩擦磨损仪检测并分析了添加剂对膜层的影响。结果表明,SiO_(2)纳米颗粒和硅酸钠的添加能够显著改善膜层的性能,膜层主要物相为金红石型和锐钛矿型TiO_(2)、α-Al_(2)O_(3)、γ-Al_(2)O_(3)、Al_(2)TiO_(5)与SiO_(2)。成膜过程中,SiO_(2)纳米颗粒和硅酸钠的加入能有效增加膜层的厚度与致密度,同时具有优异物理性能的SiO_(2)纳米颗粒可以直接沉积在放电通道处,大大提高了膜层的耐磨性和耐腐蚀性。其中,添加SiO_(2)纳米颗粒的膜层具有最优异的耐蚀性与耐磨性,腐蚀速率与平均摩擦系数最低分别为4.095×10^(-5)mm/a和0.30。

关 键 词：micro-arc oxidation TC4 alloy COATINGS CORROSION wea 

分 类 号：TG174.4[金属学及工艺—金属表面处理]