Corrosion behavior of chromium and oxygen plasma-modified magnesium in sulfate solution and simulated body fluid

► Cr and O dual ions implantation was used to modify the surface of Mg. ► A Cr-containing oxide layer was formed on the top layer. ► The corrosion resistances of implanted sample were enhanced in both solutions. ► Corrosion product was Mg(OH)2 with different morphologies in two solutions.