(昆明理工大學 冶金與能源工程學院，昆明 650093)
摘 要: 采用電化學方法研究urea-NaCl-ZnCl2-TiCl4離子液體中Ti(Ⅳ)在玻碳電極的陰極還原過程，并應用恒電位沉積考察溫度、電位和ZnCl2含量對沉積層的影響。結果表明：陰極反應為準可逆反應，Ti(Ⅳ)可逐步還原為Ti(0)；在低碳鋼上，Zn和Ti發(fā)生誘導共沉積，得到平整的沉積層；適當提高沉積溫度和電位可使沉積顆粒細化，鍍層表面更加致密平整，但ZnCl2含量的增加對Zn-Ti合金沉積有阻礙作用；當ZnCl2的摩爾分數(shù)為10%、溫度為80 ℃、沉積電位為−1.5~−2.0 V時，得到的鍍層平整、致密、光滑，粒徑約為0.8 μm。
關鍵字: Zn-Ti合金；TiCl4；NaCl；urea-ZnCl2；電化學沉積
（Faculty of Metallurgical and Energy Engineering,
Kunming University of Science and Technology, Kunming 650093, China）
Abstract:The cathode reaction process of Ti(Ⅳ) in urea-NaCl-ZnCl2-TiCl4 ionic liquid was studied with the electrochemical methods. The electrodeposition was carried out by the controlled potential method. The effects of temperature, potential and ZnCl2 content of ionic liquid on the coating were studied. The results indicate that the cathode reaction is a quasi-reversible reaction and Ti(Ⅳ) can be reduced to Ti(0) through stepwise reduction. The flat and compact deposits on the mild steels are obtained by the induced codeposition of Zn and Ti. Increasing temperature and potential properly is favorable to obtaining the finer and more compact deposits. However, the codeposition is inhibited by the increase of ZnCl2 content. The coating with crystal size of nearly 0.8 μm is obtained when the mole fraction of ZnCl2 is 10%, the temperature is 80 ℃ and the potential varies from −1.5 to −2V.
Key words: Zn-Ti alloy; TiCl4; NaCl; urea-ZnCl2; electrochemical deposition
