Protection against corrosion by molten salts through aluminum coatings deposited by arc thermal spray on ASTM A53 grade B steel

Abstract

ASTM A53 steel samples were coated with aluminium by EATS, they report continuity and adherence. Thermal treatment improved their performance against corrosion, because the aluminium inter-diffusions are produced from coating into substrate and iron from substrate into coating. Samples were subjected to molten salts corrosion (20 % Na2SO4 and 80 % V2O5) at range of (400–600)° C. Samples were characterized by SEM-EDS and the morphology of layers were studied, noting good protection of layer deposited and the degradation of coating happened at above fusion temperatures of salts, besides the corrosion rate increases with temperature and decreases with exposition time.