Optimization of Accelerated Corrosion of Steel Rebars by Multidirectional Current Imposition

Abstract

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.

Keywords

• artificial accelerated corrosion|steel rebar|circuit form|current distribution|corrosion potential|corrosion current density