Abstract
In this study, neutral salt spray accelerated corrosion test of copper–aluminium composite under 0–125A DC current was carried out under 5% concentration. The effect of corrosion behaviour on copper–aluminium composite by DC current was carried out by a scanning electron microscope (SEM) with energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) patterns, X-ray photoelectron spectroscopy (XPS), weight-loss method and electrochemical analysis. The results show that the current can accelerate the corrosion rate. Meanwhile, the current temperature effect can reduce the corrosion rate. The current caused directional migration of ions resulting in different corrosion products on positive and negative poles of specimen, and the corrosion degree on the positive pole was more serious. The galvanic corrosion mechanism at the copper–aluminium interface is different from the pitting corrosion mechanism far away from the interface, and the latter is more affected by DC current.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (No. U1604251), the Doctoral Start-up Foundation of Liaoning Province (No. 2019-BS-178) and the National Outstanding Youth Science Fund Project of National Natural Science Foundation of China (CN) (No. U52001216).
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Cheng, YL., Zuo, XJ., Yuan, XG. et al. Influence of DC Current on Corrosion Behaviour of Copper–Aluminium Composite Plates. Acta Metall. Sin. (Engl. Lett.) 34, 1142–1152 (2021). https://doi.org/10.1007/s40195-021-01213-5
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DOI: https://doi.org/10.1007/s40195-021-01213-5