Impact of fluoride concentration on general corrosion of Mg-Zr alloy in a Na-geopolymer and alkaline solutions

Corrosion of a metal in cementitious media can be limited when the pore solution of the binder contains corrosion inhibitors, as in the case of immobilization of magnesium nuclear wastes in France. This works aims to elucidate the impact of NaF on the magnesium corrosion, when it is incorporated in the Na-geopolymer formulation. The presence of NaF, even in small concentrations, considerably reduces the amount of corrosion products found on the magnesium/Na-geopolymer interface. Some concentration ranges were considered optimal for reducing corrosion and are related to the type of corrosion film formed on the metal surface, which provides greater protection.