压铸镁合金植酸转化处理中添加剂的研究  

Study on Additives in Phytic Acid Treatment for Diecasting Magnesium Alloy

作　　者：宋东福[1] 赵雅情[1] 戚文军[1] 梁涛 农登[1] 

机构地区：[1]广州有色金属研究院材料加工研究所,广州510650 [2]广州市机械科学研究院有限公司,广州510700

出　　处：《材料导报》2013年第20期99-102,共4页Materials Reports

基　　金：广东省粤港关键领域重点突破项目(2010A090604001);广东省重大科技专项(2011A080403005)

摘　　要：通过在植酸基础转化液中添加两种不同组成的成膜促进剂制备镁合金植酸转化膜,采用SEM、EDS及失重法研究了添加剂对转化膜结构、形貌及耐蚀性能的影响。结果表明:经植酸转化处理后,镁合金表面耐蚀性能均得到了大幅提高,120h盐水浸泡后失重率仅为镁合金基材的1/5;Ca(NO3)2、NH4VO3及Na2C4H4O6·2H2O组合添加剂的加入有利于改善膜层结构和致密性,转化膜由完整、致密且与基材结合紧密的内层和网纹的外层组成,耐蚀性能较纯植酸转化膜提高1倍,而NaF、Na2B4O7及Na2C4H4O6·2H2O的组合添加剂则对转化膜结构和耐蚀性能影响不显著。Two different kinds of phytic acid conversion coatings on magnesium alloy were prepared in phytic acid base conversion solution with accelerants. The effect of additives on the structure, morphology and corrosion re- sistance of conversion coating were investigated by SEM, EDS and weight loss method, respectively. The results show that the magnesium alloy surface corrosion performance is improved substantially through phytie acid conversion treat- ment, and the weight loss of conversion coating is only 1/5 of the magnesium alloy substrate after 120 h saline soa- king. The structure and compactness of conversion coating are greatly improved by adding Ca（NO3 ）2, NH4 VO3 and Na2 C4 H4 06 ~ 2H2 O, as the conversion coating consists of inner layer which is combined with the substrate compactly and outer layer which exhibits overlapping curve. The corrosion resistance of corversion coating increases 100% com- pared to pure phytic acid conversion coating. However, other additives such as NaF, Naz B4 07 and Na2 C4 H4 06 ~ 2H20 have no significant impact on structure and corrosion resistance of phytic acid conversion coating.

关 键 词：镁合金 添加剂 植酸转化膜 失重率 

分 类 号：TG178[金属学及工艺—金属表面处理]