纳米封孔7Cr13电弧喷涂涂层的组织与耐腐蚀性  

Microstructure and corrosion resistance of nano sealed 7Cr13 coating by arc spraying

作　　者：杜海清[1] 吴玉萍[1] 洪晟[1] 郭文敏[1] 何智华[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《金属热处理》2011年第2期56-59,共4页Heat Treatment of Metals

摘　　要：采用电弧喷涂工艺在基体Q235钢上喷涂了厚度约为150μm的7Cr13涂层,并采用3种封孔工艺对涂层进行封孔处理,封孔剂采用添加不同含量的纳米A l2O3异丙醇溶液的有机硅透明树脂。用乙酸盐雾腐蚀、全浸泡腐蚀以及电化学腐蚀检测了7Cr13涂层与对比材料镀铬层的耐腐蚀性能。结合扫描电镜、光学显微镜对腐蚀前后试样的表面形貌进行了观察和对比。结果表明,涂层呈层状结构,涂层封孔后孔隙率明显降低,涂层结合强度为47 MPa,远高于镀铬层,封孔涂层的耐腐蚀性明显优于未封孔涂层,纳米封孔7Cr13涂层的耐腐蚀性能优于镀铬层。7Cr13 coating was fabricated on Q235 steel with thickness of about 150 μm by arc spraying,the coating was sealed by three different sealing technologies,and the sealing agent was transparent silicone resin with different content of nano Al2O3 isopropanol.Corrosion resistance of the coating was evaluated by acetic acid salt fog corrosion,full immersion corrosion and electrochemical corrosion method and was compared with chromium-plating layer.Surface morphologies of the coating before and after corrosion were observed and compared by scanning electron microscopy and optical microscopy.The results show that the coating is layered morphology,porosity of sealed coating reduces significantly,and bonding strength of the coating is 47 MPa,which is much more higher than that of the electroplating chromium layer.The sealed coating has more excellent corrosion resistance than un-sealed coating,and corrosion resistance of nano sealed 7Cr13 coating is better than that of the chromium-plating layer.

关 键 词：电弧喷涂 7Cr13 封孔 纳米AL2O3 耐蚀性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]