Crevice corrosion behavior and mechanism of laser additive manufacturing nickel-based alloy under wedge-shaped crevice by using wire beam electrode
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 14 August 2023
Issue publication date: 20 November 2023
Abstract
Purpose
The purpose of this study is to investigate the crevice corrosion behavior and mechanism of laser additive manufacturing (LAM) nickel-based alloy under wedge-shaped crevice.
Design/methodology/approach
First, the opening size of the wedge-shaped crevice was designed to 0.1, 0.3 and 0.5 mm by controlling the thickness of silicon rubber and the double-side adhesive tape. Then, one side of the glass sheet was stuck on the silicon strip and keep the electrodes of Rows 1 and 2 outside the crevice as a reference, and the opposite side was stuck to the wire beam electrode by silica gel.
Findings
The current density with a maximum value of 5.7 × 10−6 A/cm2 was observed at the crevice opening of 0.5 mm, while the lowest value of 9.2 × 10−7 A/cm2 was found at the crevice opening of 0.1 mm. In addition, the corrosion resistance at the inside of the crevice is higher than that at the outside and the middle of the crevice. It means that the internal width of the wedge-shaped crevice tends toward 0, which hinders the migration of ions in the corrosive medium. The generation of corrosive products further reduce the crevice size to cause the inhibition of corrosion at the inside of the crevice as well.
Originality/value
The multilayer and multipath LAM component is prepared to show the complex microstructure, which made the corrosion behavior and mechanism at wedge-shaped crevice nondeterminacy.
Keywords
Acknowledgements
This research was financially supported by the National Natural Science Foundation (No. 52174007), Project of Sichuan Department of Science and Technology (No. 2023YFSY0017), and Research and Innovation Fund for Graduate Students of Southwest Petroleum University (No. 2022KYCX109).
Citation
Xi, Y., Wang, Q., Wu, Y., Zhang, X., Dong, L., Bai, S. and Yang, Y. (2023), "Crevice corrosion behavior and mechanism of laser additive manufacturing nickel-based alloy under wedge-shaped crevice by using wire beam electrode", Anti-Corrosion Methods and Materials, Vol. 70 No. 6, pp. 314-327. https://doi.org/10.1108/ACMM-06-2023-2833
Publisher
:Emerald Publishing Limited
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