热镀锌层三价铬钝化工艺的研究  

Research on trivalent chromium passive technology of hot dip galvanized layer

作　　者：范永哲[1] 宋冰新 周宗才[2] 

机构地区：[1]河北工业大学,天津300130 [2]天津市工大镀锌设备有限公司,天津300402

出　　处：《金属制品》2015年第1期37-40,共4页Metal Products

基　　金：河北省重大技术创新项目;编号12216701Z

摘　　要：通过试验介绍一种钝化膜耐蚀性与铬酸盐钝化相当的三价铬钝化工艺,并对钝化膜成膜机制进行研究。试验使用Q235低碳钢为基体材料,采用溶剂法热镀锌工艺制备热镀锌层;用中性盐雾试验、扫描电镜和能谱(SEM)分析对钝化膜性能进行检测;钝化液配方(均指质量浓度):硫酸铬35 g/L,硝酸钠50 g/L,柠檬酸40 g/L,硫酸镍12 g/L,氯化钠10 g/L;用正交试验确定钝化工艺:p H为2.7,钝化温度控制在60℃,钝化时间180 s。此工艺得到的钝化膜耐盐雾腐蚀时间可达84 h。To introduce a trivalent chromium passivae process of which passive film corrosion resistance is similar to chromate passivation, and formation mechanism of passive film is researched. The experiment adopts Q235 low carbon steel as matrix mate- rial, adopts solvent method hot dip galvanizing process to produce hot dip galvanizing layer. The passive film properties are tested by adopting neutral salt spray test, SEM and EDS. The passive solution formulation is as follows ：. Cr2 （SOn） 3 35 g/L, NAN03 50 g/L, citric acid 40 g/L, NiSO4 12 g/L, NaC1 10 g/L. The passive process is determined by orthogonal test as follows： pH 2.7, passive temperature controlled 60℃, passive time 180 s, the durable time to salt spray of passive film is 84 hours.

关 键 词：热镀锌层 三价铬钝化 钝化液配方 钝化温度 钝化时间 

分 类 号：TG178[金属学及工艺—金属表面处理]