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Microscopic origin of high corrosion resistance in 316L stainless steel by acidic passivation treatments

Chengchang Niu (Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, China)
Shiqing Deng (Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China and School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, China)
Yu Yan (Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China)
Leigang Wu (Research and Development Department, Xuancheng PVE Cleantech Co. LTD, Xuancheng City, China)
Ran Tao (Research and Development Department, Xuancheng PVE Cleantech Co. LTD, Xuancheng City, China)
Jun Chen (Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China and Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 3 June 2022

Issue publication date: 4 August 2022

142

Abstract

Purpose

The purpose of this paper is to fill the knowledge gap in the microscopic origin of high corrosion resistance in the passivated 316 L stainless steel.

Design/methodology/approach

Here, the pitting corrosion potential of the passivated 316 L stainless steel is measured, as well as the non-passivated one. Using the aberration-corrected scanning transmission electron microscopy, the microstructure of the passive film is unambiguously revealed. Combining the electron energy loss spectroscopy with the X-ray photoelectron spectroscopy, the depth profiling analysis is conducted and the variations in composition from the very surface of the passive film to the internal steel are clarified.

Findings

By optimizing the passivation treatment process, the authors significantly increase the pitting corrosion potential of the passivated 316 L stainless steel by 300 mV, compared with the non-passivated one. The passive film features a unique amorphous multilayer structure. On the basis of the depth profiling analysis, the origin of the high corrosion resistance achieved is unraveled, in which the redistribution of elements in the multilayer passive film, especially the enrichment of Cr in the topmost layer and Ni at the film-metal interface, prevent the oxidization of the inner iron of the steel.

Originality/value

This study advances understanding of the nature of the passive film from a microscopic view, which can be helpful for the further improvement of the corrosion resistance performance.

Graphical Abstract

This study introduces a model for the multilayer structure of passive films that reveals the reconstitution of the passive films after the opportune passivation treatments. Due to the redistribution of elements caused by passivation, the enrichment of Cr in the outer layer and Ni near the film-metal interface leads to enhance corrosion resistance performance.

Keywords

Citation

Niu, C., Deng, S., Yan, Y., Wu, L., Tao, R. and Chen, J. (2022), "Microscopic origin of high corrosion resistance in 316L stainless steel by acidic passivation treatments", Anti-Corrosion Methods and Materials, Vol. 69 No. 5, pp. 463-468. https://doi.org/10.1108/ACMM-03-2022-2631

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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