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Corrosion behavior of reinforcing bar in magnesium phosphate cement based on polarization curve

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Abstract

Apart from focusing on the analysis of the characteristics of reinforcing bars during corrosion, such as open circuit potential and polarization, the study also engages in the investigation of their corrosion in magnesium phosphate cement (MPC). For a more comprehensive understanding of the rusting performances, a comparison was made by an electrochemical workstation between the reinforcing bars in the MPC system and in the ordinary cement. Meanwhile, under an optical microscope, an observation was conducted on the corrosion morphology in MPC at different ages of concrete while during MPC hydration, an exploration based on pH changes and polarization curve theory was carried out to learn about the mechanism of the resistance of the reinforcing bars in MPC to corrosion. Despite their extremely slow rate, corrosion behaviors were practically found in the reinforcing bars in MPC. Both the changes in pH and the formation of ammonium phosphate metal complex in the weak base were considered in the study to be the control factors for the resistance of reinforcing bars in MPC to corrosion.

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Acknowledgements

The authors would like to express their gratitude to Science and Technology Program of Henan Province of China (182102210418), and Key scientific research projects of universities in Henan (19B560004;20B560010), and National Natural Science Foundation of China (51972337), and Funding for the high-level scientific research team of Kaifeng University, and Funded by the science and technology platform of Kaifeng University collaborative innovation center for new energy-saving building materials.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Kaifeng University, Henan Kaifeng, 475004, China

    Li Jun

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221008, Jiangsu, China

    Li Jun, Ji Yongsheng & Xu Zhishan

  3. Sponge City Engineering Materials Technology Research center of Kaifeng, Henan Kaifeng, 475004, China

    Li Jun

  4. Collaborative Innovation Center for New Energy-Saving Building Materials of Kaifeng University, Henan Kaifeng, 475004, China

    Li Jun

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  1. Li Jun
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  2. Ji Yongsheng
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  3. Xu Zhishan
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Correspondence to Li Jun.

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Jun, L., Yongsheng, J. & Zhishan, X. Corrosion behavior of reinforcing bar in magnesium phosphate cement based on polarization curve. Sādhanā 45, 27 (2020). https://doi.org/10.1007/s12046-019-1252-4

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  • DOI: https://doi.org/10.1007/s12046-019-1252-4

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