模型分析混凝土中钢筯的阴极保护，考虑钢筯表面有三个电化学反应。在混凝土域中计算电荷和氧传递，其中电解液电导率和氧扩散率表达成湿度的函数。研究了不同湿度中的腐蚀电流。-Model analysis of cathodic protection of steel Zhu concrete, considering the steel surface has three Zhu electrochemical reaction. In the concrete domain, the charge and oxygen transfer are calculated, in which the conductivity of the electrolyte and the oxygen diffusion rate are expressed as functions of humidity. Corrosion current in different humidity was studied.