HOT CORROSION PERFORMANCE OF AMORPHOUS Al2O3 COATING
(Institute of Corrosion and Protection of Metals; Academia Sinica; Shenyang 110015; China
Abstract:The amorphous Al2O3 coatings were prepared on superalloy GH30 by dc reactive sputtering. Hot corrosion behaviors of the coated and uncoated specimens were studied in 75％Na2SO4+25％K2SO4 melt at I 123 K by either immersing the samples half in sulphate or applying sulphate deposit. The Al2O3 coatings reduced the hot corrosion rates by about one magnitude, and the internal sulphidation was not observed in the Al2O3 coated specimens.)
Abstract:The amorphous Al2O3 coatings were prepared on superalloy GH30 by dc reactive sputtering. Hot corrosion behaviors of the coated and uncoated specimens were studied in 75％Na2SO4+25％K2SO4 melt at I 123 K by either immersing the samples half in sulphate or applying sulphate deposit. The Al2O3 coatings reduced the hot corrosion rates by about one magnitude, and the internal sulphidation was not observed in the Al2O3 coated specimens.)
Abstract: The amorphous Al2O3 coatings were prepared on superalloy GH30 by dc reactive sputtering. Hot corrosion behaviors of the coated and uncoated specimens were studied in 75％Na2SO4+25％K2SO4 melt at I 123 K by either immersing the samples half in sulphate or applying sulphate deposit. The Al2O3 coatings reduced the hot corrosion rates by about one magnitude, and the internal sulphidation was not observed in the Al2O3 coated specimens.
Key words: Al2O3 coating hot corrosion reactive sputtering