Electrochemical and Mechanical Behavior of Aluminum Aa2024-T3 Coated With Hybrid Matrix Containing Graphene Oxide

Abstract

The aeronautics industry uses aluminum alloy AA2024-T3 due to its low density and good mechanical properties. However, this alloy requires the use of protective coatings because it does not have the corrosion and wear resistance required by the aeronautics industry. In this context, this work aims at evaluating the performanceof AA2024-T3 aluminum coated with hybrid films containing graphene oxide. The hybrid films were obtained by a dip coating process from a sol composed by tetraethoxysilane/3 (trimethoxysilylpropyl) methacrylate/cerium nitrate/ethanol/water with different concentrations of graphene oxide in suspension. The morphology was evaluated by Scanning Electron Microscopy. The corrosion resistance and wear behavior of the obtained coatings were characterized by open circuit potential, polarization curves and dry wear tests using constant force in a ball-on-plate tribometer. In the studied conditions, the metal coated with hybrid matrix films containing graphene oxide presented no changes in the corrosion resistance, but it showed a positive contribution to the wear resistance.