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

Sumera Siddique, Ayrton A. Bernussi, Syed Wilayat Husain, Muhammad Yasir

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish
Article number125882
JournalSurface and Coatings Technology
Volume394
DOIs
StatePublished - Jul 25 2020

Keywords

  • Cold spray coatings
  • Corrosion protection
  • Heat treatment
  • Magnesium alloy
  • Structure integrity
  • Wear resistance

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