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Influence of calcium nitrite on the passive films of rebar in simulated concrete pore solution

Yanbing Tang (Key Laboratory of Durability Technology for Harbor and Marine Structure, CCCC Fourth Harbor Engineering Institute Co., Ltd. , Guangzhou, China and Marine Equipment and Technology Institute, Jiangsu University of Science and Technology , Zhenjiang, China)
Shengnian Wang (Key Laboratory of Durability Technology for Harbor and Marine Structure, CCCC Fourth Harbor Engineering Institute Co. Ltd. , Guangzhou, China)
Yunpu Xu (Key Laboratory of Durability Technology for Harbor and Marine Structure, CCCC Fourth Harbor Engineering Institute Co. Ltd. , Guangzhou, China)
Jingxu Ni (Key Laboratory of Durability Technology for Harbor and Marine Structure, CCCC Fourth Harbor Engineering Institute Co. Ltd. , Guangzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 2 May 2017

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Abstract

Purpose

This paper aims to study the influence of the addition of calcium nitrite on the passive films of rebar to reveal what causes calcium nitrite to further prolong the durability service life of the reinforced concrete structures.

Design/methodology/approach

A comprehensive experimental study of the passive films, such as components, surface morphologies, electric structure and compactness, was carried out in a saturated calcium hydroxide solution which is normally used to simulate concrete pore solution by using X-ray photoelectron spectroscopy, atomic force microscopy, Mott–Schottky and potentiostatic polarization, respectively.

Findings

The results showed that the passivation behavior of rebar has been changed dramatically by the addition of calcium nitrite. That is, the passive film formed in the solution with the addition of 10 g/L Ca(NO2)2 had less donor density (Nd), more positive plat potential, smoother surface and lower content of Fehydrox than that formed in the solution without Ca(NO2)2.

Originality/value

The study focuses on the passive films and provides a more clear cognition of the durability service life extension of the reinforced concrete structures caused by the addition of calcium nitrite.

Keywords

Acknowledgements

This investigation is supported by The National Key Technology R&D Program of China under the contract nos. 2011BAG07B00 and Science and Technology Program of China Communications construction company Ltd. under contract nos. 2014-ZJKJ-PTJS06 and 2012-ZJKJ-14. The authors are also grateful to Dr Lan Hu for the modification of English.

Citation

Tang, Y., Wang, S., Xu, Y. and Ni, J. (2017), "Influence of calcium nitrite on the passive films of rebar in simulated concrete pore solution", Anti-Corrosion Methods and Materials, Vol. 64 No. 3, pp. 265-272. https://doi.org/10.1108/ACMM-05-2016-1667

Publisher

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Emerald Publishing Limited

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