Corrosion resistance and mechanism of steel rebar coated with three types of enamel

► Three types of enamel coatings have different microstructures. ► All enamel coatings improve corrosion resistance of rebar to various extents. ► Unlike damaged FBE coating, enamel coatings experience no under-film corrosion. ► Enamel coatings are less sensitive to mechanical damage than FBE coating. ► Pure/double enamel coatings have higher corrosion resistance than mixed enamel coating.