Issue 14, 2017, Issue in Progress

Insight into a high temperature selective oxidation of HP40 alloy under a H2–H2O environment

Abstract

In the present work, a selective oxidation process of HP40 alloy at 1050 °C under a H2–H2O environment were studied in detail by means of SEM, EDS, GD-OES, XRD, Raman spectra and XPS. The results revealed that selective oxidation of Mn and Cr elements was realized, and the oxide scale preferentially grew via grain boundary rather than via grain lattice. The oxide scales were composed of a majority of MnCr2O4 spinel and a spot of Cr2O3 throughout the oxidation process. Mn existed in the form of Mn2+ ions on the surface, while Cr existed in various species. Metal hydroxides appeared on the surface approved by spectra of the O 1s region, and the relative amount of them decreased with oxidation time.

Graphical abstract: Insight into a high temperature selective oxidation of HP40 alloy under a H2–H2O environment

Supplementary files

Article information

Article type
Paper
Submitted
27 Oct 2016
Accepted
23 Jan 2017
First published
26 Jan 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 8589-8597

Insight into a high temperature selective oxidation of HP40 alloy under a H2–H2O environment

B. Bao, J. Liu, H. Xu, B. Liu, K. Zhang and Z. Jin, RSC Adv., 2017, 7, 8589 DOI: 10.1039/C6RA25933B

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