ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING, vol.47, no.11, pp.12789-12802, 2022 (SCI-Expanded)
The motivation of this study is to develop and investigate the properties of nano-coated reinforcements against corrosion instead of previously used cathodic protection, epoxy coatings (that reduces reinforcement and concrete adherence) or organic and inorganic inhibitors (chemicals with proven toxicity). The purpose of conducting this manuscript is the comparison of the corrosion resistance of coated and uncoated reinforcements and determine the durability features and protection effectiveness of the coatings against harmful effects after the harmful ions leak into the concrete and reach the reinforcement. Reinforced concrete steels were coated for the first time in the structural area with nano-coatings by thermionic vacuum arc (TVA) system. Thus, another application area of nanotechnology was revealed. When we compare the TVA system with other systems in the literature, the system we recommend allows high adhesion and high-quality coatings at very low temperatures. The innovative side of this investigation was development of nano coatings that increase the corrosion resistance of structural steels. In this research; Zinc (Zn), Zinc-Boron (Zn-B) and ZincBoron-Nitrogen (Zn-BN) nano-crystal coatings were applied to reinforced concrete reinforcements with Thermionic Vacuum Arc (TVA) system. Then, the corrosion rates of coated and uncoated reinforcements were compared with accelerated corrosion tests. After these tests, the real weight losses were determined by removing the reinforcements in the specimens. The real weight loss that occurred after exposing the reinforcement to corrosion effect was compared with the theoretical weight loss calculated from the Faraday equation. Experimental results showed that; among the specimens, the best result was obtained from sample coated with Zn-BN. Compared to uncoated reinforcement, real weight losses caused by corrosion decreased by 32.67%, 50.64% and 90.08% in Zn, Zn-B and Zn-BN nano crystal composite coated reinforcements, respectively.