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采用Na3PO4-KF-HF溶液对TC4钛合金进行表面转化膜处理,结果表明,50g/L磷酸三钠、20g/L氟化钾及2.5%氢氟酸组成的溶液体系能够使钛合金表面有效黑化。研究了酸洗对Na3PO4-KF-HF溶液体系TC4钛合金表面转化膜处理成膜增重的影响,结果表明,25℃下反应6min时成膜效果最好;对成膜前后的涂层附着力进行比对结果表明,经过磷酸盐-氟化物混合溶液处理的样品表面涂层不脱落,附着力得到了显著提升;并采用SEM、EDS、XRD对转化膜表面形貌和组成进行了分析。
The surface conversion coating of TC4 titanium alloy with Na3PO4-KF-HF solution showed that the solution system composed of 50g / L trisodium phosphate, 20g / L potassium fluoride and 2.5% hydrofluoric acid could make the surface of titanium alloy effectively black The The effect of pickling on the weight gain of TC4 titanium alloy surface conversion coating was studied. The results show that the film formation is the best when the reaction is carried out at 25 ℃ for 6 min. The coating adhesion before and after film formation The results of the comparison show that the surface coating and the adhesion of the sample treated with the phosphate-fluoride mixed solution do not drop off, and the adhesion is significantly improved. The surface morphology and composition of the conversion coating are analyzed by SEM, EDS and XRD.