CAJ | 학술논문

采用电化学方法研究urea-NaCl-ZnCl2-TiCl4离子液体中Ti(Ⅳ)在玻碳电极的阴极还原过程,并应用恒电位沉积考察温度、电位和ZnCl2含量对沉积层的影响.结果表明:阴极反应为准可逆反应,Ti(Ⅳ)可逐步还原为Ti(0);在低碳钢上,Zn和Ti发生诱导共沉积,得到平整的沉积层;适当提高沉积温度和电位可使沉积颗粒细化,镀层表面更加致密平整,但ZnCl2含量的增加对Zn-Ti合金沉积有阻碍作用;当ZnCl2的摩尔分数为10%、温度为80℃、沉积电位为?1.5~?2.0 V时,得到的镀层平整、致密、光滑,粒径约为0.8μm.
채용전화학방법연구urea-NaCl-ZnCl2-TiCl4리자액체중Ti(Ⅳ)재파탄전겁적음겁환원과정,병응용항전위침적고찰온도、전위화ZnCl2함량대침적층적영향.결과표명:음겁반응위준가역반응,Ti(Ⅳ)가축보환원위Ti(0);재저탄강상,Zn화Ti발생유도공침적,득도평정적침적층;괄당제고침적온도화전위가사침적과립세화,도층표면경가치밀평정,단ZnCl2함량적증가대Zn-Ti합금침적유조애작용;당ZnCl2적마이분수위10%、온도위80℃、침적전위위?1.5~?2.0 V시,득도적도층평정、치밀、광활,립경약위0.8μm.
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.