钢热浸镀锌层氟钛酸–聚丙烯酸复合转化膜制备和表征  

Preparation and characterization of hexafluorotitanic-polyacrylic acid composite conversion coating on hot-dip galvanized steel

作　　者：王海霞 许乔瑜[2] 唐穗平 李志宏 

机构地区：[1]广东产品质量监督检验研究院,广东佛山528300 [2]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《电镀与涂饰》2015年第23期1345-1350,共6页Electroplating & Finishing

基　　金：广东省教育部产学研结合项目(201213091100312)

摘　　要：在以氟钛酸为成膜剂的转化液中添加聚丙烯酸(PAA),在热浸镀锌层上制备了氟钛酸–聚丙烯酸复合转化膜(简称H–P转化膜),获得了最佳成膜工艺:H2Ti F6(质量分数60%)5 m L/L,Mn(H2PO4)2·2H2O 15 g/L,PAA 10 m L/L,p H 2.5,处理时间1 min。通过扫描电镜(SEM)研究了复合转化膜成膜过程的表面形貌,采用能谱(EDS)、红外光谱(IR)和X射线光电子能谱(XPS)技术对膜层组成进行了表征。结果表明,PAA参与了成膜反应,所获得的H–P转化膜表面均匀致密,主要由Zn的氧化物、氟化物、磷化物,Ti的氧化物,Mn的氧化物以及聚丙烯酸盐类物质组成,其耐蚀性能比纯氟钛酸转化膜高。A hexafluorotitanic-polyacrylic acid （H-P） composite conversion coating was formed on hot-dip galvanized steel by adding polyacrylic acid （PAA） to a conversion bath based on hexafluorotitanic acid as film-forming agent. The optimal conditions of the H-P composite conversion coating process are as follows： H2TiF6 （60wt%） 5 mL/L, Mn（H2PO4）2·2H2O 15 g/L, PAA 10 mL/L, pH 2.5, and treatment time 1 min. The surface morphology of the conversion coating during its formation process was studied by scanning electron microscopy （SEM）. The composition of the H-P composite conversion coating was characterized by energy-dispersive spectroscopy （EDS）, infrared （IR） spectroscopy, and X-ray photoelectron spectroscopy （XPS）. The results showed that PAA involves in the coating formation reaction. The H-P composite conversion coating is of uniform and compact surface and composed zinc fluoride, zinc phosphide, polyacrylate and the oxides of Zn, Ti, and Mn, and has better corrosion resistance than pure hexafluorotitanic acid conversion coating.

关 键 词：钢 热浸镀锌 氟钛酸 聚丙烯酸 转化膜 表征 

分 类 号：TG174.443[金属学及工艺—金属表面处理] TG178[金属学及工艺—金属学]