Study on numerical calculation method of corrosion mechanism for Co-12 laser cladding layer
Abstract
Purpose
The restoration and strengthening of QT600 is an industry bottleneck challenge. The Co-12 cladding layer has great wear and corrosion resistance. The purpose of this paper is to quantitatively reveal the transient evolution law of the corrosion process of Co-12 cladding layer on QT600 surface.
Design/methodology/approach
In this paper, a three-dimensional numerical model of the corrosion process of Co-12 cladding layer by QT600 laser cladding is established. The interaction between pitting pits and corrosion medium is considered to reveal the transient evolution of ion concentration, electrode potential, pH and corrosion rate at different locations.
Findings
The calculation shows that the ion concentration in pitting pit changes Cl−>Co2+>Na+, pH value decreases from top to bottom and corrosion rate at bottom is greater than that at top. The electrochemical corrosion test of Co-12 cladding layer was carried out. It is shown that the current density of QT600 increases by an order of magnitude compared to the Co-12 cladding layer, and the corrosion rate is 4.862 times higher than that of the cladding layer.
Originality/value
The results show that Co-12 cladding layer has great corrosion resistance, which provides an effective way for QT600 protection.
Keywords
Acknowledgements
Funding: This work was supported by National Key R&D Program “Advanced Structures and Composite Materials” of China (2021YFB3702002); The Applied Basic Research Project of Liaoning Province (2023JH2/101300226); Innovative Talent Support Program of Higher Education Institutions of Liaoning Province (20201020); The Open Competition Mechanism to Select the Best Candidates Science and Technology Project of Anshan City (20221220).
Declarations: All analyses were based on previously published studies; thus, no ethical approval and patient consent are required. All authors agree with the participation and publication of this article. The authors declare that the authors do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
Citation
Deng, S., Li, C., Han, X., Yu, M. and Sun, H. (2024), "Study on numerical calculation method of corrosion mechanism for Co-12 laser cladding layer", Anti-Corrosion Methods and Materials, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/ACMM-03-2023-2766
Publisher
:Emerald Publishing Limited
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