Oxide pegs improved α-Al2O3 scale adhesion on aluminide coatings

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-02-20 DOI:10.1016/j.corsci.2025.112809

Guo-Hui Meng, Pei-Pei Gui, Shan-Shan Li, Ya-Nan Wang, Ming-Yang Zhang, Kai-Yu Guo, Mei-Jun Liu, Guan-Jun Yang

引用次数: 0

Abstract

This study aimed to improve the adhesion of α-Al₂O₃ scale on aluminide coatings. Precipitation heat treatment at 1100°C in an inert atmosphere led to the formation of HfO₂ pegs on the coating surface. These pegs penetrated deep into the coating, mechanically anchoring the α-Al₂O₃ scale and significantly improving its adhesion. The heat-treated coating exhibited reduced scale spallation and enhanced oxidation resistance. The formation of HfO₂ pegs was attributed to the surface oxidation of Hf segregated from the superalloy substrate to the coating surface. The surface segregation of Hf also contributed to a reduction in the growth rate of α-Al₂O₃ scale, thereby helping to prevent scale spallation.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.