Research on the corrosion resistance and the passive film growth of Ni-based superalloy surface treated by ultrasonic impact
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 6 December 2023
Issue publication date: 2 January 2024
Abstract
Purpose
The purpose of this study is to investigate the corrosion resistance of superalloys subjected to ultrasonic impact treatment (UIT). The passive film growth on the superalloys’ surface is analyzed to illustrate the corrosion mechanism.
Design/methodology/approach
Electrochemical tests were used to investigated the corrosion resistance of GH4738 superalloys with different UIT densities. The microstructure was compared before and after the corrosion tests. The passive film characterization was described by electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) tests.
Findings
The compressive residual stress and corrosion resistance of the specimens significantly increased after UIT. The order of corrosion resistance is related to the UIT densities, i.e. 1.96 s/mm2 > 1.71 s/mm2 > 0.98 s/mm2 > as-cast. The predominant constituents of the passive films are TiO2, Cr2O3, MoO3 and NiO. The passive film on the specimen with 1.96 s/mm2 UIT density has the highest volume fraction of Cr2O3 and MoO3, which is the main reason for its superior corrosion resistance.
Originality/value
This study provides quantitative corrosion data for GH4738 superalloys treated by ultrasonic impact. The corrosion mechanism is explained by the passive film’s characterization.
Keywords
Acknowledgements
Since submission of this article, the following author(s) have updated their affiliations: Hairui Jiang is at the School of Mechanical Engineering, Liaoning Petrochemical University, Fushun, China and Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China.
This work was supported by the National Key R&D Program of China under Grant (No. 2021YFB3700401) and Basic scientific research projects of colleges and universities of Liaoning Provincial Department of Education (No. LJKMZ20220753).
Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Citation
Jiang, H., Guan, J., Zhao, Y., Yang, Y. and Qu, J. (2024), "Research on the corrosion resistance and the passive film growth of Ni-based superalloy surface treated by ultrasonic impact", Anti-Corrosion Methods and Materials, Vol. 71 No. 1, pp. 65-73. https://doi.org/10.1108/ACMM-09-2023-2899
Publisher
:Emerald Publishing Limited
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