Preparation of HVAF prepared Al-based amorphous coating and its corrosion behavior characterization

QIU Shi; ZHANG Lianmin; HU Hongxiang; ZHENG Yugui; YANG Baijun; WANG Jianqiang

doi:10.19693/j.issn.1673-3185.01696

Volume 15 Issue 4

Aug. 2020

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Chinese Journal of Ship Research > 2020 > 15(4): 89-96. > DOI: 10.19693/j.issn.1673-3185.01696 CSTR: 32390.14.j.issn.1673-3185.01696

QIU Shi, ZHANG Lianmin, HU Hongxiang, ZHENG Yugui, YANG Baijun, WANG Jianqiang. Preparation of HVAF prepared Al-based amorphous coating and its corrosion behavior characterization[J]. Chinese Journal of Ship Research, 2020, 15(4): 89-96. DOI: 10.19693/j.issn.1673-3185.01696

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Preparation of HVAF prepared Al-based amorphous coating and its corrosion behavior characterization

1.
Key Laboratory of Structure Corrosion Protection and Control of Aviation Science and Technology, China Special Vehicle Research Institute, Jingmen 448035, China
2.
CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3.
Shenyang National Laboratory for Materials Science, Shenyang 110016, China

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Received Date: July 28, 2019
Revised Date: September 21, 2019
Available Online: December 07, 2020

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Abstract

Objectives To improve corrosion resistance of 2024 aluminum alloy, this paper investigates the preparation of an advanced coating and its corrosion behaviors.
Methods 2024 aluminum alloy was coated with an Al-based amorphous alloy coating using high-velocity air fuel spraying(HVAF)technology at high spraying speed. The composition, microstructure and corrosion morphology of the coating and matrix were analyzed using an X-Ray diffractometer, transmission electron microscope and scanning electron microscope, and potentiodynamic polarization plots and EIS curves in 3.5% NaCl solution were measured.
Results The results indicate that the cooling rate of the melt particles is higher than the critical cooling rate of the amorphous alloy due to the high spraying speed, which greatly increases the amorphous content of the coating. Meanwhile, the high spraying speed effectively reduces the porosity of the coating. The amorphous content of the coating reached 81.3% and the porosity of the coating was low at 0.35%. Moreover, the corrosion resistance of the Al-based amorphous alloy coating was obviously superior to that of the 2024 aluminum alloy with a lower corrosion current density(8×10^-6 A/cm²)and a higher pitting potential(-0.30 V). The impedance value of the coating was four times that of the 2024 aluminum alloy substrate. The corrosion mechanism of the Al-based amorphous alloy coating was homogeneous corrosion, while that of the 2024 aluminum alloy was pitting.
Conclusions The high amorphous content and low porosity of the Al-based amorphous alloy coating contribute to its improved corrosion resistance.
- high-velocity air fuel spraying(HVAF),
- thermal spraying,
- Al-based amorphous alloy coating,
- porosity,
- corrosion behavior

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