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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。
Arc spraying process was used to spray 7Cr13 coating with a thickness of about 150μm on Q235 steel substrate. Three kinds of sealing process were used to seal the coating. The sealing agent was prepared by adding different content of nano-Al 2 O 3 isopropanol solution Of silicone transparent resin. Corrosion resistance of 7Cr13 coating and that of the comparative material chrome plating was tested by fogging with acetate, full immersion corrosion and electrochemical corrosion. Combined with scanning electron microscope and optical microscope, the surface morphology of the samples before and after corrosion was observed and compared. The results show that the coating has a layered structure, the porosity of the coating is significantly reduced, the coating bonding strength is 47 MPa, much higher than the chrome plating layer, the corrosion resistance of the sealing coating is obviously better than the un-sealing coating , Nano-sealed 7Cr13 coating corrosion resistance better than chrome layer.