(1. 湘潭工学院环境工程与化学新材料研究所, 湘潭 411201;
2. 中南工业大学冶金物理化学和化学新材料研究所, 长沙 410083)
摘 要: 提供了一种由络合剂、稳定剂、添加剂组成的Cr(Ⅲ)水溶液电镀镜面非晶态铬新方法。采用Hull槽实验、动电位扫描(LSV)、计时电流(CA)、计时电位(CE)等电化学方法对Cr(Ⅲ)水溶液中电沉积非晶态铬的电化学机理进行了研究。实验结果表明在-0.96～-1 .1 V之间生成的蓝膜是光亮非晶态Cr层得以电沉积出来的首要条件。讨论了Cr2+离子和Cr(Ⅲ)配合离子在电沉积非晶态铬镀层中的作用以及镜面非晶态铬镀层的形成机理。并用X射线衍射和扫描电子显微镜(SEM)等方法对铬镀层的结构进行了检测分析。
关键字: 电沉积；非晶态铬；电化学
（1. Institute of Environment Engineering and New Chemical Materials,
Xiangtan Polytechnic University, Xiangtan 411201, P.R.China;
2. Institute of Metallurgy Physical Chemistry and New Chemical Materials,
Central South University of Technology, Changsha 410083, P.R.China）
Abstract:A new type of Cr(Ⅲ) aqueous solution containing complexing agent, stabilizer and additives has been proposed for the electrodeposition of a mirror bright amorphous chromium. The mechanism of electrodeposition of amorphous chromium in the bath are studied by means of Hull cell experiment, linear sweep voltammetry (LSV), chronoamperometry (CA) and chronopotentiometry (CE). Experiments show that the electrodeposition of a blue film composed of Cr(OH)3, which were electrodeposited firstly at -0.96～-1.1V in the bath, is a prerequisite for the electrodeposition of the mirror bright amorphous chromium layer. The roles of Cr2+ and Cr(Ⅲ) complexes for electrodeposition of amorphous chromium and the mechanism of electrodeposition we re discussed. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the chromium deposits.
Key words: electrodeposition; amorphous chromium; electrochemistry
