Bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C

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

doi:10.1016/j.corsci.2019.02.014

Bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C

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

Department of Mechanical, Materials and Manufacturing Engineering

Research output: Journal Publication › Article › peer-review

14 Citations (Scopus)

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.

Original language	English
Pages (from-to)	154-162
Number of pages	9
Journal	Corrosion Science
Volume	151
DOIs	https://doi.org/10.1016/j.corsci.2019.02.014
Publication status	Published - 1 May 2019

Keywords

Bioxidant corrosion
CoNiCrAlY
IN738
Internal nitridation
β-phase depletion

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

Access to Document

10.1016/j.corsci.2019.02.014

Cite this

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title = "Bioxidant corrosion behaviour of CoNiCrAlY coated IN738 at 1100 °C",

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.",

keywords = "Bioxidant corrosion, CoNiCrAlY, IN738, Internal nitridation, β-phase depletion",

author = "H. Chen and X. Hou and J. He and H. Guo",

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AU - Chen, H.

AU - Hou, X.

AU - He, J.

AU - Guo, H.

PY - 2019/5/1

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N2 - 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.

AB - 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.

KW - Bioxidant corrosion

KW - CoNiCrAlY

KW - IN738

KW - Internal nitridation

KW - β-phase depletion

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