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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 further improve the corrosion resistance of Ni60A alloy coating, a new type of high chromium-nickel-base alloy powder material was developed by increasing Cr content in the alloy and adding suitable Mo, Nb, Cu and rare earth elements. High-chromium-nickel-base composite coatings were prepared by oxy-acetylene flame spray technique. The morphology, phase composition and micro-composition of the coatings were analyzed by SEM, EDS and XRD. The corrosion resistance of the coating was tested by immersion test and CHI660B electrochemical workstation. The results show that increasing the content of Cr in Ni60A alloy and adding suitable amount of Mo, Nb, Cu and rare earth elements can refine the grain of the alloy matrix to make the matrix structure more uniform and compact; the morphology and size of the hard phase can be improved; Uniformly distributed on the Ni matrix to form a dispersion-strengthened phase and significantly improve the corrosion resistance of the alloy coating in 1 mol / L sulfuric acid and 1 mol / L hydrochloric acid.