Electrochemical corrosion performances of laser thermal sprayed amorphous Al–Ti–Ni coatings in marine environment
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 27 February 2020
Issue publication date: 11 March 2020
Abstract
Purpose
The purpose of this paper is to investigate the effects of laser power on the electrochemical corrosion performance in 3.5% NaCl, 0.1 M H2SO4 and 0.1 M NaOH solutions, which provided an experimental basis for the application of Al–Ti–Ni amorphous coating in marine environment.
Design/methodology/approach
Amorphous Al–Ti–Ni coatings were fabricated on S355 structural steel by laser thermal spraying (LTS) at different laser powers. The surface and cross-section morphologies, chemical element distribution, phases and crystallization behaviors of obtained coatings were analyzed using a scanning electron microscope, energy-dispersive X-ray spectroscope, X-ray diffraction and differential scanning calorimetry, respectively. The effects of laser power on the electrochemical corrosion performances of Al–Ti–Ni coatings in 3.5% NaCl, 0.1 M H2SO4 and 0.1 M NaOH solutions were investigated using an electrochemical workstation.
Findings
The crystallization temperature of Al–Ti–Ni coatings fabricated at the laser power of 1,300 and 1,700 W is ∼520°C, whereas that fabricated at the laser power of 1,500 W is ∼310°C. The coatings display excellent corrosion resistance in 3.5% NaCl and 0.1 M NaOH solutions, while a faster dissolution rate in 0.1 M H2SO4 solution. The coatings fabricated at the laser power of 1,300 and 1,700 W present the better electrochemical corrosion resistance in 3.5% NaCl and 0.1 M NaOH solutions, whereas that fabricated at the laser power of 1,500 W exhibits the better electrochemical corrosion resistance in 0.1 M H2SO4 solution.
Originality/value
In this work, Al-wire-cored Ti–Ni powder was first on S355 steel with the laser power of 1,300, 1,500 and 1,700 W, and the effects of laser power on the electrochemical corrosion performance in 3.5% NaCl, 0.1 M H2SO4 and 0.1 M NaOH solutions were investigated using an electrochemical workstation.
Keywords
Acknowledgements
Financial support for this research by the Key Research and Development Project of Jiangsu Province (BE2016052) and the Innovation Project of Scientific Research and Practice for Postgraduates of Jiangsu Province are gratefully acknowledged.
Citation
Dejun, K. and Haixiang, C. (2020), "Electrochemical corrosion performances of laser thermal sprayed amorphous Al–Ti–Ni coatings in marine environment", Anti-Corrosion Methods and Materials, Vol. 67 No. 2, pp. 140-149. https://doi.org/10.1108/ACMM-09-2019-2184
Publisher
:Emerald Publishing Limited
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