Na_2SO_4-and NaCl-Induced Hot Corrosion Behaviors of a Nickel-Base Superalloy with Aluminide Diffusion Coating

摘要

Hot-corrosion behaviors of nickel-base superalloy and aluminide diffusion coating have been investigated in conditions of contents of Na_2SO_4 and NaCl molten salts at 900℃ by means of XRD and SEM. Hot-corrosion scale of the superalloy and aluminide diffusion coating were analyzed and their surface Morphologies were observed. The results demonstrate that both coated and uncoated specimens are not Susceptible to various contents of NaCl. That may be resulted from the Al_2O_3 scale formation. Growth stress was Characterized by the formation of convoluted scales.