脉冲单电源等离子铬镍共渗层的耐蚀性  

Corrosion Resistance of Nickel-chromizing Layer Prepared by Pulse Single Power Plasma

作　　者：袁琳[1] 高原[1] 张维[1] 陈选楠[1] 王成磊[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,桂林541004

出　　处：《腐蚀与防护》2012年第11期940-942,951,共4页Corrosion & Protection

基　　金：国家自然科学基金(50764002);广西自治区自然科学基金重点项目(2010GXNSFD013008)

摘　　要：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。A nickel-chromizing layer was formed on the surface of Q195 steel by pulse single power plasma. The surface morphology, phase composition and Cr-Ni content of nickel-chromizing layer were analyzed by XRD, SEM and EDS. The polarization curves of nickel-chromizing layer in 3. 5 % NaC1 solution and 1 mol/L HNO3 solution were measured by electrochemical tests. The corrosion morphology was investigated and compared that of unprocessed samples of Q195 steel. The results show that the main phase composition of nickel-chromizing layer was Fe-Cr-Ni solid solution. The surface convex cellular organizations of nickel-chromizing layer were dense. The composition of the surface was Cr 16. 9%, Ni 48. 16%, and iron remaining. In NaC1 solution, the surface of unprocessed sample of Q195 steel was corroded seriously resulted in holes, but the surface of nickel-chromizing layer only showed minor localized corrosion and produced some plaques. In HNOa solution, the unprocessed sample of Q195 steel showed serious surface corrosion, but it was almost not corrode in the nickel-chromizing layer, i,e. , the corrosion resistance of the latter was much higher than that of the former.

关 键 词：脉冲 铬镍共渗 耐蚀性 

分 类 号：TG174.445[金属学及工艺—金属表面处理]