Corrosion Behavior of Reinforced Gabion Rebars in Dry and Wet Cyclic Salt Environments

Abstract

 In order to investigate the corrosion resistance of reinforced gabion rebars in dry and wet cyclic salt environments，the failure behavior of HPB300 ordinary steel，NH400 weathering steel，NS142 and NS336 corrosion resistance steels in a dry and wet cyclic salt spray [5%(mass fraction) NaCl solution] corrosion environment was studied by dry and wet cyclic accelerated corrosion test.The changes in corrosion rate，phase，morphological structure and electrochemical properties of 4 types of steels in a dry wet cyclic salt solution medium were studied by corrosion weight loss method，XRD，SEM and electrochemical test，and the changes in corrosion resistance and mechanical properties of 4 types of steel in simulated accelerated environment were further compared and analyzed.Results showed that after 105 cycles of accelerated cycling in 5%NaCl solution corrosion medium，the corrosion rates of HPB300 steel and NH400 steel were significantly higher than that of NS142 and NS336，and the self-corrosion potential was more negative.After accelerated corrosion test，the tensile strength of HPB300 steel could no longer meet the application requirements of reinforced gabion rebars，whereas the tensile strength of NH400，NS142 and NS336 still met the service conditions.Therefore，NS142 and NS336 corrosion resistant steel were more suitable for the application of reinforced gabion rebars in salt spray corrosion environment.

Keywords

• reinforced gabions|dry and wet cycle|salt spray corrosion environment|corrosion resistant steel|weathering steel