Bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C

Chen, H.; Hou, X.; He, J.; Guo, H.

Abstract

This paper investigates the bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C. Free-standing CoNiCrAlY coatings and CoNiCrAlY coated IN738 were isothermally oxidised in air at 1100 °C for periods up to 100 h. It is found that the bioxidant corrosion occurred in the coated IN738 samples, in which the β phases in the CoNiCrAlY coating were significantly consumed by internal oxidation and internal nitridation. Aluminium nitrides and titanium nitrides were found to exist in the CoNiCrAlY coating after bioxidant corrosion. The internal nitridation is likely to occur when no protectives oxides can form at the coating surface.

Citation

Chen, H., Hou, X., He, J., & Guo, H. (2019). Bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C. Corrosion Science, 151, 154-162. https://doi.org/10.1016/j.corsci.2019.02.014

• Journal Article Type: Article
• Acceptance Date: Feb 11, 2019
• Online Publication Date: Feb 19, 2019
• Publication Date: May 1, 2019
• Deposit Date: Mar 19, 2019
• Publicly Available Date: Feb 20, 2020
• Journal: Corrosion Science
• Print ISSN: 0010-938X
• Electronic ISSN: 1879-0496
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 151
• Pages: 154-162
• DOI: https://doi.org/10.1016/j.corsci.2019.02.014
• Keywords: CoNiCrAlY; IN738; Bioxidant corrosion; Internal nitridation; β-phase depletion
• Public URL: https://nottingham-repository.worktribe.com/output/1583775
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0010938X18316883