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Effect of Sn on the corrosion behavior of weathering steel in a simulated tropical marine atmosphere

Cheng Jiang (University of Science and Technology Beijing, Beijing, China)
Ying Yang (University of Science and Technology Beijing, Beijing, China)
Xuequn Cheng (University of Science and Technology Beijing, Beijing, China)
Jinbin Zhao (Research Institute, Nanjing Iron and Steel Co., Ltd, Nanjing, China)
Xiaogang Li (University of Science and Technology Beijing, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 21 February 2020

Issue publication date: 11 March 2020

Abstract

Purpose

This study aims to study the effect of Sn on the corrosion behavior of weathering steel (WS) in a simulated tropical marine atmosphere.

Design/methodology/approach

Indoor alternate immersion tests, electrochemical measurements and real-time current-monitoring technology based on the galvanic corrosion principle were used and the scanning electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy and electron probe microanalyzer were used to analyze the morphology and component of the rust layer.

Findings

The results indicated that Sn has a positive influence on the corrosion process. Sn participated in the composition of the rust layer in the form of SnO2 and is enriched in the inner rust layer. SnO2 participated in the coprecipitation process with iron oxides and oxyhydroxides, which promoted further transformation of γ-FeOOH to α-FeOOH. As a result, the rust layer of Sn-containing steel was continuous, compact and effectively blocked the invasion of aggressive Cl. Therefore, the additive of Sn enhanced the corrosion resistance of WS in a simulated tropical marine atmosphere.

Originality/value

The corrosion behaviors of WS were researched by the real-time current-monitoring technology which was rarely used.

Keywords

Acknowledgements

This research was funded by the National Key Research and Development Program of China [grant number 2016YFB0700502] and the National Natural Science Foundation of China [grant number 51671028].

Citation

Jiang, C., Yang, Y., Cheng, X., Zhao, J. and Li, X. (2020), "Effect of Sn on the corrosion behavior of weathering steel in a simulated tropical marine atmosphere", Anti-Corrosion Methods and Materials, Vol. 67 No. 2, pp. 129-139. https://doi.org/10.1108/ACMM-09-2019-2178

Publisher

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Emerald Publishing Limited

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