Enhancing structural integrity, corrosion resistance and wear properties of Mg alloy by heat treated cold sprayed Al coating

In this study, the effect of heat treatment of cold sprayed Al coatings onto Mg substrate has been studied. The heating process was carried out under vacuum at 300 °C for 1 h. The compositional and microstructural comparison of the as-sprayed and heat-treated Al coatings was performed via X-ray diff...

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Bibliographic Details
Published in:Surface & coatings technology 2020-07, Vol.394, p.125882, Article 125882
Main Authors: Siddique, Sumera, Bernussi, Ayrton A., Husain, Syed Wilayat, Yasir, Muhammad
Format: Article
Language:English
Subjects:
Aluminum coatings
Cold spray coatings
Cold spraying
Cold treatment
Corrosion protection
Corrosion resistance
Corrosive wear
Densification
Field emission microscopy
Grain boundaries
Heat treating
Heat treatment
Magnesium alloy
Magnesium base alloys
Microstructure
Protective coatings
Sprayed coatings
Structural integrity
Structure integrity
Substrates
Wear mechanisms
Wear resistance
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Summary:In this study, the effect of heat treatment of cold sprayed Al coatings onto Mg substrate has been studied. The heating process was carried out under vacuum at 300 °C for 1 h. The compositional and microstructural comparison of the as-sprayed and heat-treated Al coatings was performed via X-ray diffraction and field emission scanning electron microscope. The results disclosed the densification and increased inter-particle bonding in heat-treated Al coatings in comparison to that of the as-sprayed Al coatings. The corrosion resistance was investigated using potentiodynamic polarization technique in 3.5 wt% NaCl solution. Wear behavior of the samples demonstrated that the heat-treated coatings had better wear resistance than that of the substrate and as-sprayed coatings. The wear mechanisms were explained from a worn surface using FESEM. Overall, the enhanced structural integrity, corrosion and wear resistance of heat treated coatings was noted and ascribed to the densification of microstructure and reduction in grain boundaries due to the heat treatment. •Al coatings were fabricated via cold spraying process on AZ91D magnesium alloy substrate.•The effect of relatively low temperature and short time heat treatment on sprayed coatings was studied.•The microstructure analysis of the compact coatings revealed low porosity with no phase change during deposition process.•The heat-treated coatings significantly improved corrosion and wear resistance of the Mg substrate.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2020.125882