Preparation of Al2O3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel
(1. Metal Corrosion and Surface Protection Laboratory,
Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Key Laboratory for Corrosion, Erosion and Surface Technology,
University of Science and Technology Beijing, Beijing 100083, China)
Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Key Laboratory for Corrosion, Erosion and Surface Technology,
University of Science and Technology Beijing, Beijing 100083, China)
Abstract: Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure.
Key words: Al2O3/Au composite coatings; magnetron sputtering; oxidation resistance; spallation resistance