Study on the corrosion performance of supersonic atmospheric plasma sprayed Cr3C2-NiCr coatings
Abstract
Purpose
Due to the harsh underground environment in coal mining, the surface of hydraulic support columns corrodes severely, resulting in significant economic losses. Therefore, a highly corrosion-resistant coatings is needed to extend the service life of the columns.
Design/methodology/approach
This study aims to compare the corrosion resistance of ST-Cr3C2-NiCr (sealed treatment Cr3C2-NiCr) coatings with industrially applied chromium plating. The corrosion failure mechanism of the coatings was investigated.
Findings
The results demonstrated that the ST-Cr3C2-NiCr coatings exhibited excellent corrosion resistance. After sealing treatment, the corrosion potential of Cr3C2-NiCr coatings was −0.215 V, and the corrosion current density of Cr3C2-NiCr coatings was lower than that of the plated parts.
Practical implications
ST-Cr3C2-NiCr coatings prepared by supersonic atmospheric plasma spraying could provide excellent corrosion resistance in the coal industry.
Originality/value
The low porosity and the presence of the NiCr phase were crucial factors contributing to the preferable corrosion resistance exhibited by the ST-Cr3C2-NiCr coatings. The corrosive process of the coatings involved layer-by-layer delamination of surface oxide film, sub-surface pitting, formation and degradation of sub-surface passive film, as well as severe block-like delamination.
Keywords
Acknowledgements
The work is supported by Science and Technology Program of Weiyang District, Xi'an (project number: 2023-05) and Institute's Self-developed Technology Project (project number: 0801YK2317).
Availability of data and material: The data sets used or analyzed during the current study are available from the corresponding author on reasonable request.
Compliance with ethical standards: The authors declared that they have no conflicts of interest to this work.
Author contributions: Chong Zhang: Investigation and Validation, Writing-original draft preparation.
Jiayi Xiang: Writing-original draft guidance.
Qifan Wen: Coating preparation.
The authors declared that they have no conflicts of interest to this work.
Citation
Zhang, C., Xiang, J. and Wen, Q. (2024), "Study on the corrosion performance of supersonic atmospheric plasma sprayed Cr3C2-NiCr coatings", Anti-Corrosion Methods and Materials, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/ACMM-12-2023-2930
Publisher
:Emerald Publishing Limited
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