0Cr13Ni5Mo不锈钢电火花强化表面耐腐蚀性能研究

Research on corrosion resistance of electro-spark surface strengthening layer for stainless steel 0Cr13Ni5Mo

针对我国水轮机过流部件长时间运行后表面腐蚀严重这一问题,选用YG8电极材料对水轮机叶片用0Cr13Ni5Mo不锈钢进行电火花表面强化处理,基于电化学测试技术和交流阻抗测试方法,对强化层的电化学腐蚀性能进行了深入研究.结果表明,强化过程中电极材料与基体材料元素相互熔渗和扩散,强化层内有新的相结构生成,且强化层为冶金结合.与基体材料相比,在腐蚀溶液中电火花强化后试件的自腐蚀电位增大,自腐蚀电流密度减小,试件腐蚀速度变慢,耐腐蚀性能明显提高.

For the abrasion phenomenon of the turbine flowing-passage components was very serious, the electrospark surface strengthening process of stainless steel 0Cr13Ni5Mo by YG8 electrode was carried out in this paper. Based on the electrochemical measurement technique and the electrochemical impedance spectroscopy test method, the electrochemical corrosion properties of strengthening layer is studied. The results show that in the process of strengthening, the electrode materials and substrate material mutual infiltration and melting element diffusion, new phase structure are formed in the strengthening layer, and the strengthening layer is metallurgical combination. In the corroding liquor, the corrosion potential of the strengthening layer increases, the corrosion current density decreases, the corrosion speed slows down, and the corrosion resistance performance of strengthening layer are improved.