Synergistic effect of simultaneous proton irradiation and LBE corrosion on the microstructure of the FeCrAl(Y) coatings

FeCrAl(Y) coatings have excellent LBE corrosion resistance, but their actual performance could be predicted more accurately by simultaneous irradiation and corrosion experiments. Here two kinds of FeCrAl coatings were corroded at 550 ℃ while subjected to simultaneous proton irradiation. The results showed that irradiation did not change the three-layered structure of the surface oxide scale. Compared with the FeCrAl coating, the FeCrAlY coating has better corrosion resistance in the unirradiated-corroded area, while undergoing more serious accelerated corrosion in the simultaneous irradiation and corrosion area. The corrosion mechanism was discussed in detail and a corrosion model was proposed.