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Passivation behavior of 316L stainless steel in artificial seawater: effects of pH and dissolved oxygen

Zhaopeng Wang (USTB, Beijing, China)
Yi Wang (Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, China)
Bowei Zhang (University of Science and Technology Beijing, Beijing, China)
Zhan Zhang (Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, China)
Kui Xiao (Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, China)
Junsheng Wu (Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, China)
Qiong Yao (Key Laboratory of Space Launching Site Reliability Technology, Haikou, China)
Guojia Ma (Department of Materials Application Research, China Aviation Manufacturing Technology Institute, Beijing, China)
Gang Sun (Department of Materials Application Research, China Aviation Manufacturing Technology Institute, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 28 April 2021

Issue publication date: 25 May 2021

236

Abstract

Purpose

The purpose of this paper is to investigate the influence of the potential of hydrogen (pH) and dissolved oxygen in artificial seawater on the passivation behavior of 316L stainless steel.

Design/methodology/approach

The corrosion behavior was studied by using electrochemical measurements such as electrochemical impedance spectroscopy and polarization curve. The passive films were characterized with X-ray photoelectron spectroscopy.

Findings

The polarization resistance of the passive film decreases as the pH value drops ascribed to the formation of much more point defects. The donor carrier concentration (ND) in the passive film formed in the deaerated condition is lower than that in aerated conditions. Nevertheless, this phenomenon is the opposite when the pH value is 1 due to the significant decrease of Fe oxides/hydroxides coupled with the stable content of Cr oxides/hydroxides species. In addition, the compositional variation of the passive film also leads to the changes of its semiconductor properties from N-type to bipolar type.

Originality/value

This paper shows the variation of polarization resistance, corrosion potential, passive film composition and semiconductor properties with the pH value and dissolved oxygen. The results can serve as references to the further study on crevice corrosion of 316L in seawater.

Keywords

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No.51771027, 51901018), The Fundamental Research Funds for the Central Universities (Grant No. FRF-MP-19–001, FRF-AT-20–07), National Key Research and Development Program of China (Grant No. 2017YFB0702100), National Science and Technology Resources Investigation Program of china (Grant No. 2019FY101400) and China Postdoctoral Science Foundation (Grant No. 2019M660456).

Citation

Wang, Z., Wang, Y., Zhang, B., Zhang, Z., Xiao, K., Wu, J., Yao, Q., Ma, G. and Sun, G. (2021), "Passivation behavior of 316L stainless steel in artificial seawater: effects of pH and dissolved oxygen", Anti-Corrosion Methods and Materials, Vol. 68 No. 2, pp. 122-129. https://doi.org/10.1108/ACMM-09-2020-2367

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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