UV-Vis光谱法表征化学镀Ni-P合金镀液中活性配合物组成  

UV-Vis Spectrometric Characterization of the Composition of Active Complex in the Ni-P Plating Solution

作　　者：王徐承[1] 蔡文斌[1] 王卫江[1] 柳厚田[1] 

机构地区：[1]复旦大学化学系,上海200433

出　　处：《光谱学与光谱分析》2004年第7期837-840,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金 (2 99730 0 7)资助项目

摘　　要：在化学镀Ni P合金碱性镀液中 ,使用较强的配合剂来防止镍离子的水解沉淀 ,同时用氨 氯化铵缓冲体系来维持镀液的pH值。由于镍 氨配合物的配合常数相对较小 ,通常认为氨并不参与配合作用 ,可是实际的一些实验现象无法得到合理解释。Touhami等人提出了镍 柠檬酸一氨三元配合物的放电机理 ,却未能提供该三元配合物存在的证据。利用紫外可见光谱研究了柠檬酸 氯化铵碱性Ni P合金镀液中镍离子的配合物 ,结果表明除了镍 柠檬酸配合物的存在以外还有镍 柠檬酸 氨配合物的存在。在系统研究柠檬酸盐和氨两种配体对吸收光谱影响的基础上 ,推断得出该三元配合物为Ni(Ⅱ ) (C6 H5O3-7) (NH3) 3。A strong complex agent is normally used in the alkaline chemical plating solution for Ni-P plating in order to prevent Ni ion from precipitation by hydrolysis. To keep a stable pH condition, an NH3-NH4Cl buffer system is used. Traditionally, it is considered that NH3 does not participate in the complex because of the relatively low Ni-NH3 complexing constant, but some experimental results cannot be explained reasonably. Touhami etc. have proposed a ternary Ni-citratc-NH3 complex involved in the discharge process, however they cannot give the direct support on the presence of this complex in solution. In this paper, a UV-Vis spectrometric study was carried out to identify the nickel complex in the Ni-P plating solution, and the results indicated the presence of both Ni-cit binary complex and Ni-cit-ammonia ternary complex. After the systematic investigation of the dependence of U-V-Vis spectra on the two ligands (cit and ammonia), the composition of this Ni-cit-ammonia ternary complex was supposed to be Ni(II)(C6H5O73-)(NH3)(3).

关 键 词：电镀 镍-磷合金 碱性镀液 镍-柠檬酸-氨配合物 紫外可见光谱 三元配合物 化学组成 

分 类 号：TQ153.2[化学工程—电化学工业]