钢铁表面免水洗锌系磷化膜的常温制备与性能表征  

Preparation and characterization of zinc phosphating film on surface of steel without washing at room temperature

作　　者：余取民[1] 李荣喜[1] 卢红梅[2] 

机构地区：[1]长沙学院生物工程与环境科学系,湖南长沙410003 [2]中南大学化学化工学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第5期940-944,共5页Journal of Central South University:Science and Technology

基　　金：湖南省科技计划资助项目(2006GK3070);湖南省教育厅科技计划资助项目(07C137);长沙市科技计划资助项目(K070761-31)

摘　　要：Q235钢铁试片在以磷酸、氧化锌、钼酸铵等材料组成的锌系磷化液中常温快速磷化后,自然干燥2 h以上,生成免水洗的彩色锌系磷化膜。用XPS对膜层的化学组成及结构进行表征,用SEM和EDS对膜层的形貌和元素含量进行分析,探讨磷化机理。研究结果表明:免水洗的磷化膜,由Fe3+和Zn2+的磷酸盐及少量的钼酸盐等组成,膜晶粒尺寸≤2μm,膜连续、致密,膜重≥0.9 g/m2,耐3%的NaCl溶液腐蚀约2.0 h,喷涂铁红环氧底漆后检验涂层的附着力达1级,比传统工艺(磷化后水洗)形成的磷化膜质量更好。The zinc phosphating solution was composed of H3PO4, ZnO, Ba（NO3）2, （NH4）6Mo7O24·4H2O and so on. The zinc color phosphating film without washing can be formed fleetly with the phosphating reaction on steel drying for more than 2 h at room temperature. The chemical components and structures of the films were analyzed by XPS. The morphology and element contents of the films were analyzed by SEM and EDS, respectively. The mechanism for phosphating was also explored. The results show that the phosphating film without washing is composed of phosphate with Fe^3＋ and Zn^2＋and a little of molybdate. The phosphating film, whose crystalline size is small than or equal to 2μm, is series and thick with weightiness ≥0.9 g/m^2. It bears corrupt of 3% NaC1 solution for about 2.0 h. The cling force of phosphating film, smeared by lacquer of epoxy resin antirust of iron oxide red, reaches stair, and the quality of the phosphating film is better than that of phosphating film prepared by traditional technique, i.e. washing after phosphating reaction.

关 键 词：锌系磷化膜 常温 免水洗 

分 类 号：TG174.4[金属学及工艺—金属表面处理]