Investigations of surface characteristics on AA5083 alloy with dual treatment

This study compares the mechanical, tribological, and corrosion characteristics of four different substrates: untreated (UNT), untreated substrate then coating (UNTC), LSP-treated (LSPT), and LSP-treated then coating (LSPTC). This study explains how the dual surface treatment LSP and W_HVOF based molybdenum coating on the mechanical properties and corrosion resistance of AA5083 aluminum alloy. Nanoindentation tests revealed significant improvements in hardness and Young's modulus for LSPTC specimens. Surface roughness analysis showed that LSPTC specimen increased roughness, potentially to enhancing coating bonding. Scratch and wear tests demonstrated superior wear resistance for LSPTC specimens due to their higher hardness and reduced friction. Contact angle measurements indicated that LSPTC specimen made the surfaces more hydrophobic. Electrochemical corrosion analysis revealed that LSPTC specimens exhibited the lowest corrosion rates, outperforming untreated and LSPT specimens. FESEM and XRD analyses confirmed the positive effects of LSPTC specimen on microstructure and residual stress, contributing to the improved mechanical properties and corrosion resistance.