恒电位仪是腐蚀电化学测量最重要的基本设备.虚拟恒电位仪用图形程序软件取代复杂硬件来实现恒电位功能.它的结构和参数灵活,构建简单,能满足多方面腐蚀电化学测试方法的需求,虚拟恒电位仪的实现是发展虚拟腐蚀电化学仪器的重要步骤.本文采用LabVIEW 2010编程系统和比例-积分-微分(PID)控制技术,研制了虚拟恒电位仪,并组建了VEC11-A腐蚀电化学测试系统,该系统能满足不同阻抗体系的腐蚀电化学测试需求.其腐蚀电位、稳态极化曲线、线性极化曲线、循环伏安、动电位扫描、恒电位阶跃等常规腐蚀电化学测量结果与2263电化学测试系统相近,能够满足常规腐蚀电化学测试要求,具有很大的发展空间.%A potentiostat is a fundamental piece of equipment for the study of corrosion electrochemistry and research into the application of virtual technology to potentiostats is becoming increasingly important. The functions of virtual potentiostats can be controlled and implemented using software instead of complex hardware. They would be capable of not only meeting the demands of a variety of electrochemical tests, but would also be more flexible offering a simpler structure and operating parameters. This would represent a significant development in virtual electrochemical corrosion instrumentation. In this paper, a virtual potentiostat measurement system VEC11-A (virtual electrochemical corrosion test system) has been designed based on LabVIEW. The virtual instrument system of the potentiostat, based on the proportion-integration-differentiation (PID) control technology operated under the LabVIEW 2010 programming platform, was used to determine corrosion potential measurement, polarization curves, linear polarization curves, cyclic voltammetry curves, dynamic potential anode passivation curves, and constant potential step curves. In contrast with normal electrochemical instruments, the system worked well for electrolyzers of different impedances.
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