激光熔覆Cr<sub>3</sub>Si/γ 多相涂层耐蚀性和耐磨性研究

以高纯Cr、Ni、Si粉末为原料，采用激光熔覆技术在奥氏体不锈钢1Cr18Ni9Ti表面原位合成制备金属硅化物涂层，分析涂层微观组织结构并测量其显微硬度。采用阳极极化方法评价涂层在质量分数为3.5%的NaCl溶液中的电化学耐蚀性。在室温滑动干磨条件下评价其耐磨性，以失重表征耐磨性。利用光学显微镜(OM)，扫描电子显微镜(SEM)等手段从显微角度研究涂层的失效行为。结果表明，涂层具有致密的微观多相结构，以Cr₃Si二元金属硅化物为硬质增强相，以Ni基固溶体γ相为塑性增韧基体相。涂层表现出更高的显微硬度。在3.5% NaCl溶液中涂层形成抗点蚀性能优异的钝化膜，使其具有优异的电化学耐蚀性能。在室温滑动干磨条件下涂层拥有更小的失重以及更稳定的摩擦系数，能够与对磨副GCr15发生更少的粘着，从而表现出优异的耐磨性。

Abstract

TheCr₃Si/γ multi-phase intermetallic coating on a substrate of austenitic stainless steel 1Cr18Ni9Ti is in situ synthesized by laser cladding technique to investigate the microstructure and surface properties. Electrochemical corrosion resistance is examined by anodic polarization in the 3.5% (mass fraction) NaCl solution. Wear resistance is evaluated through mass loss of specimens in room-temperature dry sliding wear experiments. The micro failure mechanisms are investigated by optical microscope (OM), scanning electron microscope (SEM) and other test measurements. Results indicate that the laser cladding coating has a multi-phase microstructure. The hard phase Cr₃Si is distributed in the Ni- base solid solution (γ) matrix, contributing to the higher microhardness. In the 3.5% NaCl solution, the passive film forms spontaneously on the surface of the coating exhibiting excellent pitting corrosion resistance. The laser cladding coating exhibits better wear resistance for the less mass loss and the lower friction coefficient.

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徐金涛, 李安, 刘栋, 王华明. 激光熔覆Cr₃Si/γ 多相涂层耐蚀性和耐磨性研究[J]. 中国激光, 2016, 43(3): 0303006. Xu Jintao, Li An, Liu Dong, Wang Huaming. Research on Corrosion Resistanceand Wear Resistance of Laser Cladding Cr₃Si/γ Multi-Phase Coating[J]. Chinese Journal of Lasers, 2016, 43(3): 0303006.

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