Oxidation behavior of Ti45Al8.5Nb alloy anodized in NH4F containing solution

•Ti45Al8.5Nb was anodized in NH4F containing solution.•Nb can reduce the critical Al content to form a continuous alumina layer.•The anodized Ti45Al8.5Nb exhibited excellent oxidation resistance at 1000 °C.•The improved oxidation resistance can be ascribed to halogen effect. Ti45Al8.5Nb was anodized...

Full description

Saved in:
Bibliographic Details
Published in:Corrosion science 2020-04, Vol.166, p.108447, Article 108447
Main Authors: Wu, Lian-Kui, Xia, Jun-Jie, Jiang, Mei-Yan, Wang, Qi, Wu, Hai-Xin, Sun, Dong-Bai, Yu, Hong-Ying, Cao, Fa-He
Format: Article
Language:English
Subjects:
Aluminum oxide
Anodization
Anodizing
Diffusion layers
Ethylene glycol
Fluorine
Halogen effect
High temperature
High temperature oxidation
Oxidation
Oxidation resistance
Oxidation tests
Spallation
Substrates
Titanium alloy
Titanium base alloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Ti45Al8.5Nb was anodized in NH4F containing solution.•Nb can reduce the critical Al content to form a continuous alumina layer.•The anodized Ti45Al8.5Nb exhibited excellent oxidation resistance at 1000 °C.•The improved oxidation resistance can be ascribed to halogen effect. Ti45Al8.5Nb was anodized in ethylene glycol and NH4F containing solution to improve the oxidation resistance. Isothermal oxidation test shows that the anodized specimens can provide excellent oxidation resistance and spallation resistance under 1000 °C. During the high temperature oxidation process, a compact and continuous alumina layer would generate on the anodized Ti45Al8.5Nb alloy. This protective alumina layer can efficiently decrease the inward diffusion of oxygen and outward diffusion of the substrate element. The improved oxidation resistance is assigned to the halogen effect caused by the fluorine component generated during the anodization process.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.108447