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为了提高矿用不锈钢的表面性能,以满足其在强腐蚀环境下的服役要求,利用等离子表面合金化技术在不锈钢基体上制备了Ti-N改性层。借助扫描电镜、能谱仪和X射线衍射仪,对Ti-N改性层的表面形貌,显微组织,成分分布和相结构进行了分析和表征。利用电化学测试技术测定不锈钢及其Ti-N改性层在腐蚀介质中的极化曲线。结果表明:与不锈钢相比,Ti-N改性层具有更高的开路电位,更低的电流密度和腐蚀速率;渗镀Ti-N处理显著提高了不锈钢的耐蚀性。
In order to improve the surface properties of mining stainless steel to meet its service requirements in a highly corrosive environment, a Ti-N modified layer was prepared on a stainless steel substrate by plasma surface alloying. The surface morphology, microstructure, composition distribution and phase structure of Ti-N modified layer were analyzed and characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Polarization curves of stainless steel and its Ti-N modified layer in corrosive media were determined by electrochemical testing. The results show that the Ti-N modified layer has higher open circuit potential, lower current density and corrosion rate than that of stainless steel. The Ti-N treatment significantly improves the corrosion resistance of stainless steel.