Reducing erosion rate of aluminum - Copper alloy by surface processes.

To reduce the erosion rates of Al–Cu (2024) alloy, a double surface process consisting of committing a Titanium coating followed by plasma nitriding was used. This treatment is carried out by depositing a thin layer of Ti on the annealed alloy surface using a DC sputtering glow discharge method, followed by plasma nitriding for 6 hours at 350 °C in a gas mixture containing 75% confidence in N2 and 25% Ar. Double coatings are made with a greatly enhanced layer depth and are formed of a multiphase layer dominated by TiN and Al3Ti. The micro hardness reaches a maximum of 152 HV, which is almost three times that of the treated alloy. When compared to uncoated AA 2024 Al alloy, the erosion resistance average of coated AA 2024 Al alloy is increased by 18%. [ABSTRACT FROM AUTHOR]