Effect of oxygen doping on the corrosion behavior of nanocrystalline coating under the synergy of solid NaCl deposit and water vapor
作者机构：Shenyang National Laboratory for Materials ScienceNortheastern UniversityShenyang 110819China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第141卷第10期
页 面：257-268页
核心收录：
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by the National Natural Science Foundation of China(No.51871051)
主 题：High-temperature corrosion Nickel-based superalloys Coatings Chlorination Water vapor
摘 要：Nanocrystalline coating with the same chemical composition as the nickel-based superalloys was proved to possess high resistance to oxidation and scale spallation,meanwhile avoid notable elements *** opens up a new direction for the development of protective ***,in a worse environment containing chlorine and water vapor,the ultrafine grains act like a double-edged sword,which can promote the formation of a protective scale of Al_(2)O_(3)or Cr_(2)O_(3),but also favor the inward dif-fusion of Cl and H_(2)O to accelerate *** order to solve this problem,moderate amount of oxygen was doped into nanocrystalline coating during magnetron ***,corrosion behavior of the two nanocrystalline coatings with or without oxygen doping was studied in the O_(2)+38%H_(2)O environment with solid NaCl *** indicated that the doped oxygen can attract active elements of Ti and Al to form TiO_(2)andθ-Al_(2)O_(3),which pinned at grain boundaries to keep the ultrafine grains stable at high temperature while prevent inward diffusion of the corrosive ***,a dense and pure chromia scale was formed quickly at surface,ensuring that the oxygen-doped nanocrystalline coating provided the highest corrosion resistance under the synergy of solid NaCl deposit and water *** contrast,the coating without oxygen doping suffered from severe internal corrosion.
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