Effect of plastic deformation on mechanical properties and corrosion resistance of nickel-aluminum bronze
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 10 September 2021
Issue publication date: 9 November 2021
Abstract
Purpose
Nickel-aluminum bronze (NAB) has been widely used in ship propellers. It is always subjected to local micro-plastic deformation in service environments. This paper aims to study the influence of plastic deformation on the mechanical strength and corrosion resistance of NAB in 3.5 Wt.% NaCl solution.
Design/methodology/approach
Scanning electron microscope and X-ray diffraction were used to analyze the microstructure of NAB alloy with different plastic deformations. Mechanical properties of the sample were measured by tensile experiment, and corrosion behavior was studied by electrochemical measurements and the long-term immersion corrosion test.
Findings
Results showed that the plastic deformation caused lattice distortion but did not change the microstructure of NAB alloy. Microhardness and yield strength of NAB were significantly improved with the increase of deformation. The lattice distortion accelerated the formation of corrosion product film, which made the deformed alloy show a more positive open-circuit potential and an increased Rp. However, during the long-term immersion corrosion, the corrosion resistance of NAB alloys deteriorated with the increase of plastic deformation. This is because larger plastic deformation brought about higher internal stress in corrosion product film, which resulted in the premature peeling of the film and the loss of its protective effect on the alloy substrate.
Originality/value
Tensile plastic deformations were found to cause a decline in the corrosion resistance of NAB. And the mechanism was clarified from the evolution of corrosion products during the corrosion process.
Keywords
Acknowledgements
This research was financed by the National Natural Science Foundation of China (No. 51971155, No. 52001226 and No. 52031007) and China Postdoctoral Science Foundation 2020M670647.
Citation
Wu, Z., Hu, Q., Qin, Z., Zhang, Y., Xia, D.-H. and Hu, W. (2021), "Effect of plastic deformation on mechanical properties and corrosion resistance of nickel-aluminum bronze", Anti-Corrosion Methods and Materials, Vol. 68 No. 6, pp. 473-480. https://doi.org/10.1108/ACMM-12-2020-2411
Publisher
:Emerald Publishing Limited
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