Al_3Ti和TiC/Al_3Ti激光熔覆涂层的高温氧化和浸泡腐蚀性能  

High-temperature oxidation and immersion corrosion properties of Al_3Ti and TiC/Al_3Ti laser cladding coatings

作　　者：符跃春[1,2] 杨智成[1,2] 王国华 何欢[1,2] 

机构地区：[1]广西大学有色金属及材料加工新技术教育部重点实验室 [2]材料科学与工程学院,广西南宁530004

出　　处：《重庆大学学报（自然科学版）》2010年第7期63-67,共5页Journal of Chongqing University

基　　金：广西科学研究与技术开发应用基础专项项目(桂科基0731005)

摘　　要：采用激光熔覆技术在铝合金表面制备了Al3Ti金属间化合物和TiC颗粒增强Al3Ti基复合材料涂层,对比分析了两种涂层的高温氧化和浸泡腐蚀性能。结果表明:在稍低于铝合金熔点(600℃)循环氧化70h后,两种涂层均没有明显的氧化增重,显示出较强的抗氧化性。氧化温度为900℃时,涂层的氧化增重呈抛物线规律增长,且复合材料涂层的抗氧化性低于Al3Ti涂层。在NaCl质量分数为3.5%的溶液中浸泡15天后,复合材料涂层的腐蚀程度最轻,涂层中的硬质相Al3Ti和TiC抑制了点蚀的扩展,但两种涂层均提高了铝合金的抗腐蚀性能。Intermetallic compound Al3 Ti coating and TiC particle-reinforced AI3 Ti matrix composite coating are prepared on the surface of aluminum alloys by laser cladding. The high-temperature oxidation and immersion corrosion behaviors of those two coatings are compared. The results show that the coatings exhibit minimal oxidation mass gains during the cyclic oxidation close to the melting point of the substrate （600℃） for 70 h, providing excellent protection to the aluminum alloys. When oxidized at 900℃, the coatings show significant mass gains in accordance with the parabolic law, and the oxidation resistance of the composite coating is lower than that of the Al3Ti coating. After immersed in 3.5 wt% NaC1 solution for 15 days, the composite coating presents the less corrosion attack for hard Al3Ti and TiC particles impede the growth of pitting, and both coatings improve the corrosion resistance of the aluminum alloys.

关 键 词：激光熔覆 金属间化合物 抗氧化性 浸泡腐蚀 

分 类 号：TG146.2[一般工业技术—材料科学与工程]