Protectiveness of Al₂O₃, Al₂O₃/TiC Coatings against a Simulated Refuse Incinerator Environment

Abstract

SUS 347H stainless steel specimens and those coated with an Al₂O₃ or Al₂O₃/TiC film by a plasma CVD were subjected to corrosion test in a simulated refuse incinerator environment at 823K for 180ks (50h). Thermal stability of the coatings was evaluated by annealing in Ar at 823K for 1.2 or 180ks. The degree of the defect generated by the annealing was assessed by polarization tests. The Al₂O₃ coating decreases the corrosion mass loss a little and the Al₂O₃/TiC dual-layer coating significantly decreases it. However, the implantation of Zr ions to the coated specimens does not affect the protectiveness of the Al₂O₃ coating and increases the corrosion mass loss to some degree for the Al₂O₃/TiC dual-layer coating.