摘要
Ti/Zr无机盐转化是目前替代六价铬工艺研究得最多的一类无铬转化工艺,而在其基础上添加Mo的研究还鲜见报道。通过化学转化方法在6063铝合金上得到了一层Ti/Zr/Mo复合有机盐的无铬有色膜。利用扫描电镜(SEM-EDS)、X射线光电子能谱(XPS)等方法研究了有色膜元素组成及形貌。结果表明:经有色转化处理后,铝合金试样表面由原来的灰色转变为紫红色,Al、Mg、Ti、Mo、O、F是转化膜主要组成元素。成膜过程大致可分为两个不同的阶段:首先F-侵蚀基材,与合金元素Mg键合成MnF_2,同时元素Al的侵蚀会导致Al_2O_3物相在微阴极区沉积形成;随后溶液中Mo、Ti金属离子发生相应阴极还原及水解反应,主要生成物为TiO_2与Mo_2O_5。膜层显色得益于后续Mo及Ti的氧化物的大量生成覆盖。
A chrome-free colored Ti/Zr/Mo combined inorganic salt coating was prepared on 6063 aluminum alloy by chemical conversion technology.The surface analytical methods such as scanning electron microscope(SEM-EDS) and X-ray photoelectron spectroscopy(XPS) were used to detect the colored element composition and morphology of films.Results showed that after treated by colored conversion technology,the color of Al alloy surface changed from grey into claret,and Al,Mg,Ti,Mo,O and F were the main elements in conversion films.Generally,the conversion process could be divided into two stages;firstly,F ions eroded substrate and bonded with Mg element from substrate to form MgF_2,and meanwhile,the erosion of Al element led to the deposition of Al_2O_3 phase at micro-cathode region.Subsequently,the reduction and hydrolysis reactions of Ti,Mo elements from the bath solution occurred,and the main deposition phases were TiO_2and Mo_2O_5.The color development of coating was attributed to a large formation of Mo_2O_5 and MoO_3 during the second stage.
出处
《材料保护》
CAS
CSCD
北大核心
2016年第11期32-35,共4页
Materials Protection
基金
湖北省自然科学基金(2014CFB262)资助
