Ti-15-3合金表面氧化物陶瓷复合涂层的制备与耐蚀性能  

Preparation and Corrosion Resistance of Ceramic Coating on Ti-15-3 Titanium Alloy

作　　者：席芳星月 胡婷婷 付雪松[1] 陈国清[1] XI Fangxingyue;HU Tingting;FU Xuesong;CHEN Guoqing(Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,Liaoning,China)

机构地区：[1]大连理工大学材料科学与工程学院辽宁省凝固控制与数字化制备技术重点实验室,辽宁大连116085

出　　处：《陶瓷学报》2021年第5期825-833,共9页Journal of Ceramics

基　　金：国家自然科学基金(U1908229);中央高校基本科研业务费资助(DUT20GF115)。

摘　　要：SiO_(2)、Al_(2)O_(3)、MgO、CaO为主要原料,B2O_(3)为助熔剂,水玻璃作为黏结剂,采用料浆法在Ti-15-3钛合金表面制备了陶瓷涂层,并研究了涂层的微观组织、显微硬度及耐腐蚀性能。结果表明,采用料浆法制备的涂层是以SiO_(2)为主要成分,同时包含Mg SiO_(4)、CaSiO_(3)均匀致密的涂层。该涂层在浓度为3.5%的海盐水中浸泡腐蚀,腐蚀15 d后其表面出现凹坑孔洞,腐蚀30 d后涂层厚度明显减薄,腐蚀60 d后凹坑增多且变大,但涂层与基体仍结合紧密。腐蚀60 d后,涂层的断裂韧性从3.75 MPa·m^(-1/2)降至2.45 MPa·m^(-1/2),其显微硬度从HV 549.2降至HV 428.6,但仍高于钛合金基体(HV399.3)。腐蚀60 d后涂层的自腐蚀电流为0.32μA/cm^(2),极化电阻为342.5 kΩ·m2,而基体的自腐蚀电流为1.32μA/cm^(2),极化电阻为18.9 kΩ·cm^(2),表明该涂层具有长效耐腐蚀性。With SiO_(2),Al_(2)O_(3),MgO,CaO and B2O_(3)as the raw materials and sodium silicate as the binder,ceramic coating was prepared on the surface of titanium alloy by using slurry method.Microstructure,microhardness and corrosion resistance of the coatings were studied.It was demonstrated that the coating was dense and uniform,with SiO_(2)as the main component and Mg SiO_(4)and Ca SiO_(3)as the minor phases.Pits and holes were observed on the coating surface after corrosion for 15 days.The coatings were thinned obviously after corrosion for 30 days.After 60 days,although the number of the pits was increased and the size was enlarged,the coating was still closely combined with the substrate.After corrosion for 60 days,the fracture toughness of the coating was decreased from 3.75 MPa·m^(-1/2)to 2.45 MPa·m^(-1/2),while the microhardness was reduced from HV 549.2 to HV 428.6,which are however still higher than that(399.3 HV)of the titanium alloy without coating.After corrosion for 60 days,self-corrosion current of the coating was 0.32μA/cm^(2)and the polarization resistance was 342.5 kΩ·cm^(2),while the self-corrosion current of the substrate was 1.32μA/cm^(2)and the polarization resistance was 18.9 kΩ·cm^(2).In conclusion,the ceramic coating has potential for practical long-term anti-corrosion applications.

关 键 词：钛合金 料浆法 陶瓷涂层 耐腐蚀性 

分 类 号：TQ174.75[化学工程—陶瓷工业]