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Open AccessArticle

Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity

1
College of Mechanics and Materials, Hohai University, Nanjing 210098, China
2
Suqian Research Institute, Hohai University, Suqian 223800, China
3
Nantong Research Institute of Materials Engineering, Nanjing University, Nantong 226000, China
4
Dongying Zhubo Architectural Science and technology consulting center, Dongying 257000, China
5
School of Material Science and Engineering, Southeast University, Najing 211100, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(10), 1050; https://doi.org/10.3390/met9101050
Received: 23 July 2019 / Revised: 11 September 2019 / Accepted: 20 September 2019 / Published: 27 September 2019
Naturally exposed rusted rebar has been widely used for the production of reinforced concrete. However, rusted rebar is prone to corrosion under chloride ion (Cl) contamination and/or at a low alkalinity of concrete. This study employed two surface modification methods, sand blasting and wire brushing, to augment the corrosion resistance of naturally exposed rusted rebar. Electrochemical tests revealed that the surface-modified rebar displayed a significant improvement of passivation in the concrete alkaline environment and anticorrosion performance in both the Cl free and Cl-containing simulated concrete pore solutions of different alkalinity. The enhanced performance was mainly due to the elimination of the rust layer and the direct exposure of the fresh metallic surface to the alkaline medium. Moreover, the effect of surface nanograins on the intensified passive film led to the best passivation performance of the wire-brushed rebar. The overall findings demonstrate that the two developed methods were conducive to the passivation and anticorrosion performance of the rusted rebar and thereby hold great promise for improving the service life of the reinforced concrete structures. View Full-Text
Keywords: rusted rebar; surface modification; surface state; passivation; corrosion behavior in Cl environment rusted rebar; surface modification; surface state; passivation; corrosion behavior in Cl environment
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Song, D.; Yang, F.; Guo, M.; Zhao, S.; Hao, J.; Chen, Z.; Sun, J.; Xu, Y.; Jiang, J. Surface Modification of Rusted Rebar and Enhanced Passivation/Anticorrosion Performance in Simulated Concrete Pore Solutions with Different Alkalinity. Metals 2019, 9, 1050.

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