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在外加电流阴极保护系统中,参比电极是用来检测船体电位和向恒电位仪提供比较讯号,以便调节保护电流的大小,使船体始终处在保护电位范围内。因此,要求参比电极在长期使用中,电位稳定、极化小、寿命长,并有一定的机械强度,便于加工安装。在海水中,银/氯化银电极是比较理想的参比电极,其电位稳定,极化小,对氯离子可逆,可以直接浸入海水中进行测量,避免了液界电位;电极面积增减容易,根据需要可制成各种形状。
In an impressed current cathodic protection system, the reference electrode is used to detect the hull potential and provide a comparison signal to the potentiostat in order to adjust the magnitude of the protection current so that the hull is always within the protective potential range. Therefore, the requirements of the reference electrode in the long-term use, potential stability, polarization, long life, and a certain degree of mechanical strength, ease of processing and installation. In seawater, silver / silver chloride electrode is an ideal reference electrode, its potential is stable, small polarization, chloride ion reversible, can be directly immersed in seawater to measure, to avoid the liquid boundary potential; electrode area increase and decrease easily , According to need can be made into various shapes.