本文選題：封閉劑　切入點：三價鉻鈍化　出處：《表面技術(shù)》2017年02期

【摘要】：目的制備性能良好的封閉劑,以提高電鍍鋅三價鉻彩色鈍化膜的耐蝕性。方法以氟化鈉、硅酸鈉、OP為主要原料制備封閉劑。采用5%醋酸鉛點滴法測定封閉處理后的電鍍鋅三價鉻彩色鈍化膜的耐蝕性能,探討了封閉劑的配方,分析了封閉時間、烘干溫度、烘干時間等工藝條件對耐蝕性的影響,并通過正交試驗對封閉工藝進行了優(yōu)化,確定了以氟化鈉和硅酸鈉為主鹽的封閉劑的鈍化處理工藝規(guī)范。結(jié)果試驗得到的封閉劑組成為:氟化鈉0.2 mol/L,硅酸鈉0.05 mol/L,OP 1 m L/L。采用該封閉劑,在浸漬時間20min、烘干溫度80℃的條件下,醋酸鉛點滴實驗最高達到近900 s。結(jié)論封閉后膜層呈彩虹色,色澤明亮,鈍化膜耐蝕性提高。
[Abstract]:Objective to prepare a good sealant to improve the corrosion resistance of zinc trivalent chromium-chromic passivating film. Sodium silicate op was used as the main raw material to prepare the sealant. The corrosion resistance of zinc trivalent chromium-chromic passivation film after blocking treatment was determined by 5% lead acetate drop method. The formula of the sealant was discussed, and the sealing time and drying temperature were analyzed. The effect of drying time on corrosion resistance was studied, and the sealing process was optimized by orthogonal test. The passivation process of the sealant with sodium fluoride and sodium silicate as the main salt was determined. Results the composition of the sealant was: sodium fluoride 0.2 mol / L, sodium silicate 0.05 mol / L, sodium silicate 1 mL / L. Under the conditions of 20 min impregnation time and 80 鈩，

本文編號：1681438