深入研究了不同工艺参数对锆系转化膜电化学行为的影响,旨在优化锆系转化膜的性能,提升金属材料的耐腐蚀能力。采用镀锌板作为试验基材,利用极化曲线测试筛选锆系转化膜成膜时的最佳工艺条件,通过扫描电镜(SEM)探测转化膜不同时间与形成过程的微观形貌,以充分了解锆化膜前处理过程中各工艺参数对其电化学行为的影响。结果显示,最优的锆系转化膜成膜工艺条件为:Zr F_(6)^(2-)浓度0.3 g/L、游离氟1.5×10^(-5)、处理时间2~4 min、处理温度40℃、p H 4.2,此时镀锌板耐腐蚀性能最优;形成大小均匀、排布紧密的锆系络合物的转化膜,并且状态良好。

This article deeply investigates the influence of different process parameters on the electrochemical behavior of zirconium based conversion coatings,aiming to optimize the performance of zirconium based conversion coatings and enhance the corrosion resistance of metal materials.Galvanized sheet was used as the test substrate,the polarization curve was used to test and screen the optimal process conditions for the formation of zirconium conversion films,and the scanning electron microscope (SEM) was used to detect the microscopic morphology of the transformation films at different times and formation processes,so as to fully understand the influence of various process parameters on their electrochemical behavior during the pretreatment of zirconium films.Results showed that the optimal conditions for zirconium conversion film deposition were as follows:Zr F_6^(2-)concentration was 0.3 g/L,free fluorine was 1.5×10^(-5),processing time was 2~4 min,processing temperature was 40℃,p H value was 4.2,the corrosion resistance of galvanized sheet was the best;A conversion film of uniform size and tightly arranged zirconium complexes was formed and was in good condition.