纳米Al_2O_3封孔对电弧喷涂3Cr13涂层耐腐蚀性能的影响  

Influence of Nano-Al_2O_3 Sealing on Corrosion Resistance of 3Cr13 Coatings Prepared by Arc Spraying

作　　者：高文文[1] 吴玉萍[1] 杜海清[1] 洪晟[1] 王博[1] 

机构地区：[1]河海大学力学与材料学院,南京210098

出　　处：《理化检验（物理分册）》2013年第12期785-789,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：采用电弧喷涂技术在Q235钢基体上制备了约150μm厚的3Cr13涂层,并采用3种添加不同含量的纳米Al2O3异丙醇溶液的有机硅树脂对其进行封孔处理,利用光学显微镜(OM)、扫描电镜(SEM)和X射线衍射仪(XRD)对涂层的微观组织和物相组成进行分析,采用全浸泡腐蚀、乙酸盐雾腐蚀以及电化学腐蚀试验研究了未封孔及封孔涂层的耐腐蚀性能。结果表明:3Cr13涂层的物相组成主要为α-Fe(Cr)和Cr2O3,涂层为典型的层状堆积结构,孔隙率约为11%;涂层封孔后的耐腐蚀性能明显优于未封孔涂层的,而且添加质量分数为6%的纳米Al2O3异丙醇溶液的有机硅封孔剂对3Cr13涂层耐腐蚀性能的提高最为显著。3Cr13 coatings were fabricated on Q235 steel substrate with thickness of about 150 μm by arc spraying, and then the coatings were sealed by three different sealing reagents which were silicone resins with different contents of nano-Al2O3 isopropanol. The morphologies and phases of the coatings were analyzed by optical microscopy（OM）, scanning electron microscopy（SEM） and X-ray diffractionmeter（XRD）. The corrosion resistance of the coatings was evaluated by full immersion corrosion test, acetic acid salt spray corrosion test and electrochemical corrosion test. The results show that the main phases of the 3Cr13 coating were a-Fe（Cr） and Cr2O3, and the coating was typical layered accumulation structure with porosity of 11%. The corrosion resistance of the sealed-coatings was obviously better than that of the unsealed-coating. Moreover, sealing reagent of silicone resin added 6% nano-Al2O3 isopropanol improved the corrosion resistance of the coatings most significantly.

关 键 词：电弧喷涂 3CR13涂层 纳米AL2O3 封孔 耐腐蚀性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]