热镀锌层表面复合氧化硅膜层的制备及性能  

Preparation and properties of composite silica coating on hot dip galvanized coating

作　　者：王子岩[1] 张欣[1] 苏孺 蔡涛 WANG Ziyan;ZHANG Xin;SU Ru;CAI Tao(School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang,Hebei,050000)

机构地区：[1]河北科技大学材料科学与工程学院,河北石家庄050000

出　　处：《金属材料研究》2021年第3期27-31,22,共6页Research on Metallic Materials

摘　　要：为改善热镀锌层的耐蚀性能,本文采用溶胶-凝胶法(sol-gel)在热镀锌层上涂覆有机-无机复合氧化硅膜层。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、粘结法和孔隙率试验对不同氧化硅膜层形貌、结构、结合力及致密性进行测试分析,并通过电化学试验和浸泡试验对热镀锌层涂覆氧化硅膜层前后的耐蚀性能进行测试。结果表明,所制备的氧化硅膜层与基体结合良好,随有机含量的增加,膜层中的颗粒直径逐渐减小,使得膜层可完全填充镀锌层中的缺陷孔洞,且表面更加致密光滑。与热镀锌基体相比,经有机复合氧化硅膜层处理后,镀锌层表面致密无缺陷,且腐蚀速率可降低近一个数量级。In order to improve the corrosion resistance of hot-dip galvanized layer,organic-inorganic composite silica films were coated on hot-dip galvanized layer by sol-gel method.The morphology,structure,adhesion and tightness of different silica films were analyzed by scanning electron microscope(SEM),X-ray diffractometer(XRD),bonding method and porosity test,and the corrosion resistance of hot-dip galvanized layer before and after coating silica films was measured by electrochemical test and immersion test.The results show that the silica film is well bonded to the substrate.With the increase of organic content,the diameter of particles in the film decreases gradually,which makes the film can completely fill the defect holes in the galvanized layer,and the surface is more compact and smooth.Compared with hot-dip galvanized substrate,after organic composite silica film treatment,the surface of galvanized layer is compact and free of defects,and its corrosion rate can be reduced by nearly one order of magnitude.

关 键 词：热镀锌 溶胶-凝胶法 有机-无机复合 氧化硅膜层 耐蚀性能 

分 类 号：TG1[金属学及工艺—金属学]