Comparative study of different environmentally friendly (Chromium-free) methods for surface modification of pure magnesium

► 3 different Chromium-free methods of surface modification on pure Mg. ► All the alternatives, non-toxic methods, improve corrosion behavior of Mg. ► Coating obtained from carbonated treatment exhibits better corrosion protection. ► Compact, stable and adherent layers of CaCO3 are formed in this method.