Abstract
The electrical resistance and polarization effect of cement paste containing reinforcement were tested to research the anti-corrosion properties of steel bars in cement paste. Moreover, the microstructure and composition of passivation film and rust on the steel bars were studied. The water–cement ratio of the cement paste in this study was 0.3, with 0.5% NaCl, 1% NaNO2, and 1% Benzotriazole, and an assembly unit of 0.5% NaNO2 + 0.5% Benzotriazole by mass of cement was added to the cement to provide a chloride environment. X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were applied to research the composition of the passivation film and the microstructure of the cement paste, respectively. The results indicated that the samples with the assembly unit of 0.5% NaNO2 + 0.5% Benzotriazole showed the highest electrical resistance and polarization electrical resistance, while the specimens with 1.0% Benzotriazole showed the lowest electrical resistance and polarization electrical resistance. Moreover, the passivation film of steel bars weakened with increasing distance from the surface of the steel bars. Therefore, the corrosion of steel bars becomes more serious with increasing distance. Finally, the influence of the rust inhibitor on the corrosion resistance of steel bars in the specimens decreased in the following order: 0.5% NaNO2 + 0.5% Benzotriazole >1.0% NaNO2>1.0% Benzotriazole.
Highlights
As a building construction material with high durability, mechanical properties and low price, concrete has been the most widely used construction building material for many years [1,2,3]
This was attributed to the fact that the addition of cathodic corrosion inhibitor can help to strengthen the corrosion resistance through physical and chemical adsorption on the surface of passive film, and does not promote the corrosion of steel bars
We investigated the effect of rust inhibitors on the electrical properties of steel-bar-reinforced cement paste
Summary
As a building construction material with high durability, mechanical properties and low price, concrete has been the most widely used construction building material for many years [1,2,3]. Anode corrosion inhibitors are able to prevent the corrosion of steel bars by improving the passive film of the steel bars [24,25]. Wang et al [28] pointed out that when a single rust inhibitor of NaNO2 or Benzotriazole was used in steel-bar-reinforced cement paste, a content of 1% was the most favorable for the corrosion resistance of the steel bars. Little attention has been paid to the influence of the assembly unit of NaNO2 and Benzotriazole on the corrosion resistance of steel bars in cement concrete with the addition of NaCl. In this paper, the influence of 1% NaNO2 , 1% Benzotriazole, and an assembly unit of 0.5% NaNO2 and 0.5% Benzotriazole on the anti-corrosion properties of steel bars in cement paste with NaCl was investigated. Surface chemical methods (X-ray photoelectron spectroscopy and scanning electron microscopy) were applied to study the change in the passive film
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
