Effect of Na2CO3 on corrosion resistance of cerium conversion film on Mg–Gd–Y–Zr magnesium alloy surface

Based on electrochemical impedance spectroscopy and hydrogen release measurements, Mg–Ce hydrotalcite film on Mg–Gd–Y–Zr magnesium alloy surface provides better corrosion protection than Ce conversion film. The better corrosion resistance can be attributed to the Mg–Ce hydrotalcite exhibiting Cl−and CO32- anion exchangeability without changing its structure in chloride media.