Deposition of Amorphous Aluminium Powder Using Cold Spray

Deposition of amorphous aluminium powder using cold spray technology as a corrosion prevention measure was studied. Amorphous aluminium (Al-Ni-Ce) powder was successfully deposited on 7000-series aluminium substrates using cold spray parameters of 13-15 bars under helium gas and temperature of between 300-400 deg C. The coatings were subjected to tensile bond strength and salt-water immersion test and comparative studies with cold sprayed pure Al6061 coatings were conducted. The results obtained showed that the amorphous aluminium coatings exhibited comparable adhensive strength while demonstrated relatively better corrosion properties. The amorphous aluminium coating was not only able to resist corrosion itself but also exhibited signs of ability to actively prevent corrosion on imperfections such as scratches in the coatings.