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采用先进的辊涂法铬酸盐预处理工艺,可获得性能优良的有机涂层钢板,并可消除由Cr(Ⅵ)引起的污染问题。 本研究采用优选法设计预处理技术参数的条件试验,并辅以化学分析、电镜、俄歇、电化学测试等手段进行。 实验结果表明:采用辊涂法预处理液C50可获得耐蚀性、涂装性及加工性均优的合金化热镀锌有机涂层钢板。C50的技术参数为:CrO_25～30g/L、NaF0.2～1.0g/L、添加剂A0.2～0.9mL/L、溶液温度30～55℃、基板温度60～80℃、烘烤温度90～120℃、处理时间4～6s、溶液pH值0.9～1.3;处理膜内Cr(Ⅲ)/Cr(Ⅵ)比值对膜的耐蚀性有直接影响,一般在3.3～5.5为宜;添加剂A具有使膜中Cr(Ⅲ)向Cr(Ⅵ)转化的作用;溶液C50各参数对处理膜的耐蚀性均有影响,其中pH值的影响较为显著;另外,本研究还对溶液与基板界面的化学反应情况进行了初步的探索。
The use of advanced roller coating chromate pretreatment process to obtain excellent performance of organic coated steel, and eliminate the pollution caused by Cr (Ⅵ). In this study, preconditioning technique parameters were preconditioned by the optimization method, and the conditions were analyzed by chemical analysis, electron microscope, Auger and electrochemical tests. The experimental results show that the pretreatment of liquid C50 by roller coating can obtain alloyed galvanized organic coated steel plate with good corrosion resistance, coating property and workability. The technical parameters of C50 are: CrO_25 ~ 30g / L, NaF0.2 ~ 1.0g / L, additive A0.2 ~ 0.9mL / L, the solution temperature is 30 ~ 55 ℃, the substrate temperature is 60 ~ 80 ℃, the baking temperature is 90 ~ 120 ℃, treatment time 4 ~ 6s, solution pH 0.9 ~ 1.3; Cr (Ⅲ) / Cr (Ⅵ) ratio in the treated film has a direct influence on the corrosion resistance of the film, The effect of pH value on the corrosion resistance of the treated film was affected by the parameters of the solution C50. In addition, the effect of the pH value on the corrosion resistance of the film was also studied. In addition, Chemical reaction conducted a preliminary exploration.