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.