LaF3对激光原位合成TiC/Ni涂层耐蚀性的影响
Effect of LaF3 on Corrosion Resistance of TiC/Ni Coating Prepared by Laser Cladding In-situ Synthesis
程义远, 王 勇, 赫庆坤, 李美艳
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作者单位：(中国石油大学 (华东) 机电工程学院, 山东 东营 257061)
中文关键字：激光熔覆； 原位合成； 稀土LaF3； 复合涂层； TiC颗粒
英文关键字：laser cladding; in-situ synthesis; rare earth LaF3; compound coating; TiC particle
中文摘要：以Ni60、Ti、石墨、Mo及LaF3为原料，在闸板表面激光熔覆原位合成了TiC/Ni复合涂层。利用SEM、电化学腐蚀系统对涂层组织和耐蚀性能进行分析。结果表明，未添加LaF3和添加3% LaF3的熔覆层中存在异质相，自腐蚀电流升高，腐蚀电位降低，耐蚀性下降；添加2% LaF3 的熔覆层中异质相消失，腐蚀电流密度降低，腐蚀电位升高，钝化区宽度增加，耐蚀性提高。
英文摘要：The TiC/Ni composite coating was prepared by laser cladding in-situ synthesis on the surface of damper plate with Ni-Cr-Ti-C-LaF3 powder．Microstructure and corrosion resistance were studied through SEM and M352 electrochemistry corrosion system. The result shows that both the coating without LaF3 and the coating with 3% LaF3 have the heterogeneous phase; the corrosion current of the two coating elevates, the corrosion potential and corrosion resistance reduces. The laser cladding with 2% LaF3 has no heterogeneous phases, which reduces the corrosion current, elevates the corrosion potential and increases the width of passivation area. So the corrosion resistance improves.