多向式强加电流的钢筋加速腐蚀方法优化研究

Optimization of Accelerated Corrosion of Steel Rebars by Multidirectional Current Imposition

强加阳极电流的方法被广泛应用于钢筋的人工加速腐蚀,但串联或并联形式加速腐蚀电路往往由于电流分布的差异导致钢筋腐蚀程度不均匀。为了优化强加阳极电流的钢筋加速腐蚀方法,提出了一种多向式的混合连接电路形式并开展钢筋加速腐蚀试验,对比分析了混合连接、串联、并联3种加速腐蚀模式下,各组钢筋试件的电流情况、腐蚀电位与腐蚀电流密度的变化、腐蚀率以及腐蚀产物情况。结果显示,串联和并联电路形式中钢筋的电流分布存在差异导致钢筋腐蚀程度不一致;混合连接形式中,电流分布均匀且钢筋表面腐蚀程度相近,各钢筋试件锈蚀率接近理论值。通过多向式的混合连接电路可以实现均匀加速腐蚀钢筋或钢筋混凝土构件,有效优化了钢筋加速腐蚀的效果,为加速腐蚀钢筋或钢筋混凝土构件提供了参考。

Imposing anode current is widely used in the artificial accelerated corrosion of steel rebars.However,the uneven current distribution in series or parallel accelerated corrosion circuits often lead to uneven corrosion degree of steel bars.In order to optimize the accelerated corrosion method of steel rebars by imposing anode current,a multidirectional hybrid connection circuit was proposed and the accelerated corrosion test of steel rebars was carried out.The current,change of corrosion potential and corrosion current density,corrosion rate and corrosion products of each group of steel rebar specimens under three accelerated corrosion modes of hybrid connection,series connection and parallel connection were compared and analyzed.Results showed that the current distributions of steel rebars in series and parallel circuits were different,which led to different corrosion degree of steel rebar.In the hybrid connection,the current distribution was uniform and the corrosion degree of steel rebar surfaces were similar,and the corrosion rate of each steel rebar was close to the theoretical value.The uniform accelerated corrosion of steel rebars or reinforced concrete specimens could be realized through the multidirectional hybrid connection circuit,which effectively optimized the effect of accelerated corrosion of steel rebars and provided reference for accelerated corrosion of steel rebars or reinforced concrete members.