Formation of protective Cr2O3 scale at high temperature and the effect of mass transport in the presence of water vapor

Ani, Mohd Hanafi and Othman, Raihan (2012) Formation of protective Cr2O3 scale at high temperature and the effect of mass transport in the presence of water vapor. Advanced Materials Research, 402. pp. 412-420. ISSN 1662-8985

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Abstract

The formation of protective Cr2O3 scale at high temperature was evaluated using Wagner’s theory of binary alloy oxidation. The results show that at 1073 K, around 9.8 wt% of Cr is required to form external Cr2O3 scale, and 3.5wt% of Cr is needed to maintain the scale. Introduction of water vapor has shifted the critical Cr concentration to higher value. The effects of water vapor in increasing Cr critical concentration to form external Cr2O3 scale was disscussed from view of oxygen permeablility and Cr diffusivity in the alloy. It is concluded that Cr diffusivity has negligible effect, while oxygen permeability increase with the presence of water vapor, thus increase the oxidation rate.

Item Type:	Article (Journal)
Additional Information:	4583/16691
Uncontrolled Keywords:	High temperature oxidation, Cr2O3 scale, Oxygen permeability, Cr diffusivity.
Subjects:	T Technology > TN Mining engineering. Metallurgy
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Mohd Hanafi Ani
Date Deposited:	27 Jan 2012 11:18
Last Modified:	08 Jun 2012 10:07
URI:	http://irep.iium.edu.my/id/eprint/16691

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