海水环境下钢筋实时防腐方法及仪器研制

Corrosion protection method for reinforced steel bar in sea water environment and instrument development

设计了一种可以在海水环境下进行钢筋实时腐蚀防护的方法并研制了相应的强制电流阴极保护仪器样机。当海水环境如成分参数发生变化时,仪器通过实验组在线测试被保护钢筋试样的阴极保护极化曲线,进而实时计算出当前环境下所需的最佳保护电流密度,然后利用此电流密度及被保护实际钢筋的结构参数和电极的结构系数计算出实际保护组所需的保护激励电流,从而使被保护的结构始终处于最佳保护状态。应用所设计仪器进行了环境参数变化情况下的防腐实验,结果表明仪器可以自动适应模拟海水盐度和温度的变化,使试样始终处于最佳保护状态。

This paper presents a real-time corrosion protection method for reinforced steel bar in sea water environment. A prototype instrument has been developed based on the method. The instrument can measure the cathodic polarization curves of the steel bar sample online when the sea water environment changes. Then the optimized protection current density can be calculated according the measured curves. And the real protection current of the object can be calculated according the optimized current density and the structure parameters of the object. Then the object being protected is always in the condition of optimized protection. The experiments under variable environment conditions using this instrument show that the instrument can automatically adapt the variation of sea water salinity and temperature, and keep the sample in the optimized status.