电解化学镀镍液钛离子的转化定量分析方法

摘要

In order to provide a quickly quantitative analysis of transferring of colored valence ions in chemical reactions,electrolytic conversion of titanium ion in electroless nickel bath was investigated in this paper. Ti3+lost its reducibility when it was oxidized into Ti4+in process of electroless nickel plating with TiCl3as a reductant.Electrolysis was introduced as a regeneration method of electroless nickel bath. Concentrations and relevant transferring rate of titanium ion were quantitatively analyzed with aids of spectrophotometry. In addition to RGB values of bath images,equation of chromaticity relative value and Ti3+content was investigated based on colorimetric quantification of electrolysis bath. Results show that Ti4+can be transferred to Ti3+with its transferring rate η up to 94.16% by electrolysis regeneration process. Furthermore, ion reduction procedure can be evaluated by image colorimetry. Chromaticity relative value U of the bath and Ti3+concentrations exhibits good liner correlation chromaticity relative value U of the bath and Ti3+concentrations exhibited good liner correlation with the coefficient R as 0.976 03.%为了解决化学反应中有色价态离子转化的快速定量分析问题,开展了化学镀镍液中钛离子的电解转化研究.在化学镀镍过程中还原剂TiCl3的Ti3+因被氧化为Ti4+而失去还原作用.采用电解法对以TiCl3为还原剂的化学镀镍产生的镀液进行再生处理,利用分光光度法定量测定镀液Ti3+的质量浓度,计算得到离子转化率,并通过采集电解过程镀液图像,分析其RGB色度值,建立色度相对值与Ti3+的质量浓度拟合关系式.研究结果表明:电解可以将Ti4+还原为Ti3+,其转化率η为94.16%;图像比色法可用于判断电解离子转化进程;溶液色度相对值U与Ti3+的质量浓度经拟合可得相关系数R为0.97603的关系式.