6063铝合金碱性铈−钼化学转化工艺及膜层组织结构  

Alkaline Ce-Mo chemical conversion process on 6063 aluminum alloy and microstructure of the conversion coating

作　　者：陆岑 张凯 穆松林[1] 杜军[1] 郭民城 LU Cen;ZHANG Kai;MU Songlin;DU Jun;GUO Mincheng(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;不详)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640 [2]广东省建筑科学研究院集团股份有限公司,广东广州510500

出　　处：《电镀与涂饰》2020年第23期1638-1642,共5页Electroplating & Finishing

基　　金：广州市科技计划项目(201804010348);广东省基础与应用基础研究基金项目(2020A1515010006)。

摘　　要：以Ce(NO3)3和Na2MoO4为成膜主盐,乙二胺四乙酸二钠(EDTA-2Na)为配位剂,在碱性条件下对6063铝合金进行化学转化处理。研究了转化液pH、温度和转化时间对Ce–Mo转化膜耐蚀性的影响,得到较优的工艺参数为:Ce(NO3)3·6H2O 6 g/L,Na2MoO48 g/L,EDTA-2Na 4 g/L,尿素18 g/L,Na2CO35 g/L,pH 8.5,温度80℃,时间20 min。所得Ce–Mo转化膜呈墨绿色,均匀、致密,主要由Al、Ce和Mo的氧化物组成,耐性硫酸铜点滴时间约为95 s。Chemical conversion of 6063 aluminum alloy was conducted in an alkaline bath based on Ce(NO3)3 and Na2MoO4 with disodium ethylenediaminetetraacetic acid(EDTA-2Na)as a complexant.The effects of bath pH,temperature,and treatment time on the corrosion resistance of Ce–Mo conversion coating were studied.The process parameters were optimized as follows:Ce(NO3)3·6H2O 6 g/L,Na2MoO48 g/L,EDTA-2Na 4 g/L,urea 18 g/L,Na2CO35 g/L,pH 8.5,temperature 80℃,and treatment time 20 min.The Ce–Mo conversion coating obtained thereunder was dark green,uniform,and compact,composed of the oxides of Al,Ce,and Mo,and able to endure copper sulfate dropping corrosion for 95 s.

关 键 词：铝合金 碱性 化学转化 铈 钼 耐蚀性 组织结构 

分 类 号：TG174.4[金属学及工艺—金属表面处理]