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A gradient layer of Al/Cr diamond-like carbon film has been prepared by magnetron sputtering on 2024 Al-alloy. Emphasis has been placed on the anti-corrosion and tribological properties of the Cr-doped diamond-like film. Experimental research: scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectrometry, nano-indentation testing, potentiodynamic polarization, electrochemical impedance spectroscopy and tribological tests were undertaken to investigate the surface morphology, surface structures, chemical composition, anti-corrosion and mechanical properties of the as-prepared gradient diamond-like carbon film. The results indicated that the Cr-doped diamond-like carbon film with intermediate transition chromium layer showed improvements with regards to hardness and corrosion prevention due to the dense surface structure and decreased electrical conductivity. Cr-doped diamond-like carbon film also displayed excellent tribological properties such as a low friction coefficient and wear rate during tribological testing.

Tribological performance and corrosion behavior of aluminum alloy protected by Cr-doped diamond-like carbon thin film