中文摘要：

采用双辉等离子表面冶金技术在风力塔架表面进行了Ni-Cr共渗处理,研究了不同共渗温度和共渗时间下合金层的物相组成、显微组织和耐腐蚀性能变化规律。结果表明,不同共渗温度和共渗时间下的风力塔架表面合金层的主要物相都为Ni2.9Cr0.7Fe0.36,在衍射角为75.6°处还出现了少量Ni3Fe相;随着共渗温度的升高和共渗时间的延长,Ni2.9Cr0.7Fe0.36主衍射峰从（111）晶面和（200）晶面过渡至（220）晶面;不同共渗温度下得到的Ni-Cr合金层的耐腐蚀性能都要比风力塔架基体好,且共渗温度为1000℃时得到的合金层的耐腐蚀性能最佳;不同共渗时间下得到的Ni-Cr合金层的耐腐蚀性能都要比风力塔架基体好,且共渗时间为1 h和3 h时得到的合金层的耐腐蚀性能最佳。

英文摘要：

The surface of wind tower was nickel-chromizing treated by double glow plasma surface metallurgy technique,the phase composition,microstructure and corrosion resistance of the nickel-chromized layer with different nickel-chromizing temperature and time were studied. The results show that,the main phase of the nickel-chromized layer with different nickel-chromizing temperature and time of wind tower is Ni_（2. 9）Cr_（0. 7）Fe_（0. 36）,and a few Ni_3Fe phase with diffraction angle of 75. 6°appears. With the increase of nickel-chromizing temperature and time,the Ni2. 9Cr0. 7Fe0. 36 main diffraction peak from the（111） crystal plane and（200） crystal plane transition to（220） crystal surface;the corrosion resistance of the nickel-chromized layer is better than the wind tower matrix,and can get the best corrosion resistance when the nickel-chromizing temperature is 1000 ℃. Corrosion resistance of the nickel-chromized layer with different co permeation time is better than wind tower matrix,and can get the best corrosion resistance when the nickel-chromizing time are 1 h and 3 h.