镀镍槽液中镍含量的在线监测系统研究  

Concentration of Nickel in Nickel Plating Bath by on-line Monitoring System

作　　者：乔永莲[1] 沙春鹏 董宇[2] 刘冰[1] 

机构地区：[1]沈阳飞机工业(集团)有限公司工艺研究部,沈阳110850 [2]中国人民解放军驻沈阳飞机工业(集团)有限公司军事代表室,沈阳110034

出　　处：《表面技术》2015年第11期128-133,共6页Surface Technology

基　　金：国家科技重大专项课题资助(2013zx04001041)~~

摘　　要：目的研发一种能够在线监测镀镍槽液中镍离子含量的测试系统,并将此方法推广至镀铬、镉、铜等槽液。方法利用计算机VC++语言编程技术、Modbus通讯技术、西门子PLC技术组成监控系统,通过耐酸碱计量泵和耐酸碱流量计对镀镍槽液取液量进行控制和校正,采用电化学测试方法对待测槽液在线监测,采用VC++语言编程技术采集电化学测试数据,最终实现对镀镍槽液中镍离子含量的自动监测。结果采用此自动控制系统测量镀镍槽液中镍离子的质量浓度,其与极化曲线中-1.0 V(vs.SCE)电位下的极化电流之间的线性拟合方程为:I=0.002 01+6.90×10-5ρ。以120 g/L待测溶液为分析对象,采用此自动检测系统测得镀镍液中Ni2+质量浓度为115.5 g/L,而采用EDTA直接滴定分析测得Ni2+质量浓度为113.7 g/L,测量误差分别为3.78%和5.25%。结论该镀镍槽液中镍离子含量的在线监测方法可靠性高,除了对镀镍槽液状态进行监控分析外,还能对镀铬槽液、镀镉槽液等进行监控分析,可适应较恶劣的生产环境。Objective To develop a new method for on-line monitoring of the concentration of nickel ions in nickel plating,and to expand its application to chromeplate,cadmium plating,copper plating and so on. Methods The system was composed by VC ＋ ＋Language programming,Modbus communication technology and PLC Siemens technology. The amount of nickel plating bath was controlled and revised by meter pump and flowmeter for nickel ion monitoring. The bath solution was automatically monitored by electrochemical testing method and then the results were collected by VC ＋ ＋ Language programming. Thus,the composition of nickel plating bath can be automatically monitored by this excellent and reliable method. Results The relationship between the nickel ions and the polarization current value at- 1. 0 V（ vs. SCE） was fitted as I = 0. 002 01 ＋ 6. 90 × 10- 5ρ by the system of online monitoring of nickel ion concentration. For 120 g / L nickel plating solution,the concentration of the nickel ions was detected as115. 5 g / L and 113. 7 g / L and the measuring error was 3. 78% and 5. 25% by this on-line monitoring and the EDTA titrimetric analysis,respectively. Conclusion With its high reliability,the system can not only be used to monitor the status of nickel plating bath,but also for the cadmium plating bath and the chromium plating bath. Most importantly,it can be used in harsh environment.

关 键 词：槽液组成 电化学测量 自动化 在线监测 PLC技术 

分 类 号：TQ153.1[化学工程—电化学工业]