双辉等离子表面冶金的Ni-Cr合金层组织结构及耐蚀性能研究  

Study on Structure and Corrosion Resistance of Ni-Cr Alloyed Layer by Double Glow Plasma Surface Metallurgy

作　　者：阮野[1] 殷瑛[2] 孔浚宇 杨梅[1] 熊瑜娟 黄俊[1] 

机构地区：[1]南昌航空大学,江西南昌330063 [2]江西省科学院,江西南昌330029

出　　处：《热处理技术与装备》2015年第6期12-15,共4页Heat Treatment Technology and Equipment

基　　金：博士启动金(EA201301029)

摘　　要：为了改善Q235碳钢表面耐蚀性能,采用双辉等离子表面冶金技术在其表面制备Ni-Cr合金层。研究了极间距对合金层组织结构的影响规律,并对合金层的组织成分和耐蚀性能进行检测分析。结果表明:随着极间距增大,Ni-Cr合金层厚度呈现先增加后减小的趋势;Ni-Cr合金层组织均匀致密,与基体呈冶金结合状态,合金层厚度约为95μm,主要物相为Ni2.9Cr0.7Fe0.36和少量Ni3Fe。电化学极化曲线试验结果显示Ni-Cr合金层的自腐蚀电位和极化电阻较基材Q235高,而自腐蚀电流密度较低,即Ni-Cr合金层更难以发生电化学腐蚀反应且腐蚀速率更低。表明Q235钢经Ni-Cr共渗处理后,其耐蚀性得到明显改善。In order to improve corrosion resistance of Q235 steel,the double glow plasma surface metallurgy was applied on surface of Q235 steel to prepare Ni-Cr alloyed layer. The effect of electrode distance on the structure of Ni-Cr alloyed layer was studied,and the structure,composition and corrosion resistance of Ni-Cr alloyed layer were detected. Result showed that with the increasing of electrode distance,the thickness of Ni-Cr alloyed layer showed trend of first increased and then decreased. The Ni-Cr alloyed layer was density,and had a metallurgical bonding with substrate. The thickness of Ni-Cr alloyed layer was 95 μm,and the main phase of alloyed layer was Ni2. 9Cr0. 7Fe0. 36 and a little of Ni3 Fe. The polarization curve indicated that the selfe-corrosion potential and polarization resistance of Ni-Cr alloyed layer were higher than one of Q235 base material and selfr-corrosion current density was lower. It meant that the Ni-Cr alloyed layer had more difficult electrochemical corrosion reaction and lower corrosion rate. The results demonstrated that the corrosion resistance of Q235 steel was significantly improved after Nickelchromiumizing.

关 键 词：双层辉光等离子表面冶金技术 Q235钢 Ni-Cr合金层 极化曲线 

分 类 号：TG174.444[金属学及工艺—金属表面处理]