新型高铬镍基合金涂层组织与耐蚀性能研究  

Study on Microstructure and Corrosion Resistance of New High-Cr Ni-based Alloy Coating

作　　者：蔡龙龙[1] 牛显明[1] 王晨曦[1] 胡春莲[1] 刘大娇 

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《热加工工艺》2016年第2期127-129,133,共4页Hot Working Technology

摘　　要：为进一步提高Ni60A合金涂层的耐蚀性,通过提高合金中Cr含量,并添加适量的Mo、Nb、Cu和稀土元素,研制出一种新型高铬镍基合金粉体材料。采用氧-乙炔火焰喷焊技术制备高铬镍基复合涂层,利用SEM、EDS和XRD对高铬镍基合金喷涂层的形貌特征、物相组成和微区成分进行分析。采用全浸实验法和CHI660B型电化学工作站对涂层的耐蚀性进行测试。结果表明:提高Ni60A合金中Cr含量,并添加适量的Mo、Nb、Cu和稀土元素,能够细化合金基体晶粒,使基体组织更加均匀致密;能够改善硬质相的形态和尺寸,并使之均匀分布于Ni基体上,形成弥散强化相;同时显著提高合金涂层在1 mol/L硫酸和1 mol/L盐酸中的耐蚀性。In order to improve the corrosion resistance of Ni60A alloy coating further, by adding chromium content in the Ni60A alloy, and the right amount of Mo, Nb, Cu and rare earth elements, a new type of high chromium nickel base alloy powder material was developed. Oxyacetylene flame spray welding technique was used to make high chromium nickel-based composite coating. The morphology, structure and composition of the high chromium nickel-based alloy coating were analyzed by SEM, EDS and XRD. The immersion test method and CHI660B type workstation were used to test the corrosion resistance of the composite coating. The results show that increasing the content of Cr in Ni60A alloy and adding the right amount ofMo, Nb, Cu, and rare earth elements can refine alloy crystal particle, make the distribution of matrix structure more uniform and dense, can improve the morphology and size of hard phase, and make it evenly distributed on the Ni matrix, forming dispersion strengthening phase. Meanwhile improve the corrosion resistance of alloy in 1 mol/L sulfuric acid and hydrochloric acid.

关 键 词：NI60A 组织结构 极化曲线 耐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]