The electrodeposition of aluminum on TiB2/A356 composite from ionic liquid as protective coating

► The ionic-liquid electrodeposition of Al was adopted to improve the corrosion resistance of composites. ► The experimental parameters greatly affected the morphology of the Al coatings. ► The cathode current efficiencies showed varied dependence on different parameters. ► The optimum parameters for producing dense and uniform Al coatings were determined. ► The TiB2/A356 composite after electrodeposition exhibited enhanced corrosion resistance.