Electrochemical Study of ZINTEK Coated Steel Bars in Magnesium Cement Concrete

Abstract

In order to solve the corrosion problem of steel bar in magnesium cement concrete, coating is proposed to protect steel bar from corrosion, and then to promote its application in the construction of the West Saline Lake and the saline soil area. Steel bar that in magnesium cement concrete is processed by ZINTEK coating and then a one-year electrochemical experiment was conducted by the CS350 electrochemical workstation on blocks in three environments, which are in the natural environment, water and magnesium chloride solution. Finally the polarization curves and electrochemical impedance spectra were analyzed by combining theory with experiment. The results show that the ZINTEK coated steel bars can be well protected from corrosion, and the corrosion current density of 360d shows that it is in a low corrosion stage. The corrosion current density is reduced with the growth of magnesium cement concrete protection layer thickness and coated steel bar corrosion current density of 50cm protective layer thickness is half an order of magnitude smaller than the thickness of 25cm.