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采用脉冲单电源等离子渗金属技术在Q195钢表面进行铬镍共渗。利用X射线衍射仪、扫描电子显微镜(SEM)及能谱仪(EDS)对渗层的表面形貌、相结构及铬镍含量进行分析。用电化学测量仪测定铬镍共渗层在3.5%NaCl、1mol/L HNO3溶液中的极化曲线,研究其腐蚀形貌。结果表明,铬镍共渗层的主要相成分为Fe-Cr-Ni固溶体。铬镍共渗层的表面呈上凸的胞状组织,排列致密。表面成分的质量分数为:Cr 16.9%、Ni 48.16%,其余铁。在NaCl溶液中,未处理Q195钢表面腐蚀严重产生蚀坑,而铬镍共渗层表面只有轻微局部腐蚀蚀斑。在HNO3溶液中,未处理Q195钢表面为严重的面腐蚀,铬镍共渗层表面几乎未被腐蚀,后者的耐腐蚀性比前者极大提高。
Pulsed single power plasma infiltration metal technology in Q195 steel chrome nickel infiltration. The surface morphology, phase structure and chromium-nickel content of the layer were analyzed by X-ray diffraction, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The polarization curves of chromium-nickel-co-diffusion layer in 3.5% NaCl, 1mol / L HNO3 solution were measured by electrochemical measuring instrument, and the corrosion morphology was studied. The results show that the main phase composition of chromium-nickel-co-diffusion layer is Fe-Cr-Ni solid solution. The surface of chromium-nickel-co-diffusion layer was convex cell structure, dense arrangement. The mass fraction of surface composition is: Cr 16.9%, Ni 48.16%, the rest iron. In NaCl solution, the surface corrosion of untreated Q195 steel produced serious corrosion pits, while the surface of chromium-nickel-co-diffusion layer had only slight localized corrosion spots. In the HNO3 solution, the surface of untreated Q195 steel was severely corroded, the surface of the CrNi layer was hardly eroded, and the corrosion resistance of the latter was greatly increased.