Electrochemical monitoring of oxygen potential on Fe-Cr alloy surface during high temperature oxidation in dry and humid conditions

Ani, Mohd Hanafi and Purwanto, Hadi and Musa, Mukhtaruddin and Illias, Suhaimi and Kaderi, Akbar and Salim, Nurjannah and Abd Rahim, Mohd Hasbi and Sutjipto, Agus Geter Edy (2022) Electrochemical monitoring of oxygen potential on Fe-Cr alloy surface during high temperature oxidation in dry and humid conditions. In: 7th International Corrosion Prevention Symposium for Research Scholars, CORSYM 2021, 17 November 2021, Virtual.

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Abstract

TheformationofanexternalCr2O3scaleisimportanttoobtaintheoxida- tion resistance of Fe–Cr alloys at high temperatures. It is well known that the critical concentration of Cr to form a protective external scale of Cr2O3 in humid condi- tions is higher than that in dry conditions, and the criterion is expressed as Wagner’s equation (Rapp in Acta Metall 9:730, 1961) [1]. A lot of mass gain data and metal- lographic surveys are required to determine the above criterion experimentally. A method of continuous monitoring of surface oxygen potential by oxygen concentra- tion cell using stabilized zirconia has been applied to the oxidation of Fe-Cr alloy in order to check the protectiveness of the scale. The objective of this study is to measure surface oxygen potentials on Fe-0-17 wt% Cr alloys in Ar-21% O2 gas in dry condition and Fe-10-22 wt% Cr alloys in Ar-20% O2-20% H2O gas in humid condition at 1073 K up to 20 ks. In dry condition, the surface oxygen potentials of Fe with more than 10 wt% Cr alloys were close to the oxygen potential of the atmosphere immediately after the heating period. It indicates that a protective Cr2O3 scale formed on these alloys at the early stage of oxidation. However, the surface oxygen potentials of these same composition alloys were lower in humid conditions than that in dry, which suggests a higher oxidation rate. This paper demonstrated that the protectiveness of scales formed on Fe–Cr alloys can be evaluated in situ in a few hours, which is beneficial to assess the high temperature oxidation of metals.

Item Type:	Proceeding Paper (Other)
Uncontrolled Keywords:	Surface oxygen potential, Oxygen sensor, High temperature oxidation
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Mohd Hanafi Ani
Date Deposited:	03 Jan 2024 15:07
Last Modified:	03 Jan 2024 15:07
URI:	http://irep.iium.edu.my/id/eprint/109550

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