Kesan wap air terhadap pengoksidaan berkitar pada aloi Fe-Cr

Translated title of the contribution: Water vapour effects of cyclic oxidation on Fe-Cr Alloys

Norinsan Kamil Othman, O. Othman, J. Zhang, D. J. Young

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Fe-Cr alloys (Cr: 9-30 wt%) were subjected to cyclic oxidation in Ar-20%O2, Ar-20%O2-5%H2O and Ar-10%H 2-5%H2O (partial pressure of oxygen, p02 = 1.1× 10-16atm). Oxidation weight change measurement showed that in general, increasing Cr content reduced the oxidation rate. At Cr ≤. 17%Cr, breakaway oxidation was observed. However, for Cr ≥ 25%, the weight gain became very low due to formation of Cr2O3 layer. Adding 5%H2O to Ar-20%O2 accelerated the oxidation rate of alloys with Cr ≤. 20%. However, this accelerating effect did not appear in high chromium content alloys. XRD analysis showed that for alloys with Cr < 20%, wustite and spinel were formed at low p02, while at high p 02, hematite, iron oxide and spinel were formed. For high Cr content alloy only Cr2O3 was detected. Cross-section analysis showed that the spinel was formed by internal oxidation. The thickness and size of this internal oxide zone increased with increasing Cr content. A dense chromia layer was observed when the Cr content was above 25%. The oxides scales formed in water vapour were more porous and less compact than the scale formed in dry oxygen. The accelerating effect of water vapour on Fe-Cr oxidation is discussed in terms of gas-solid interactions.

Original languageUndefined/Unknown
Pages (from-to)249-259
Number of pages11
JournalSains Malaysiana
Volume39
Issue number2
Publication statusPublished - Apr 2010

Fingerprint

water vapor
oxidation
spinel
oxide
hercynite
oxygen
effect
partial pressure
iron oxide
hematite
chromium
cross section
X-ray diffraction
gas
rate
analysis

Keywords

  • Cro
  • Cyclic oxidation
  • Fe-Cr alloy
  • Water vapour

ASJC Scopus subject areas

  • General

Cite this

Othman, N. K., Othman, O., Zhang, J., & Young, D. J. (2010). Kesan wap air terhadap pengoksidaan berkitar pada aloi Fe-Cr. Sains Malaysiana, 39(2), 249-259.

Kesan wap air terhadap pengoksidaan berkitar pada aloi Fe-Cr. / Othman, Norinsan Kamil; Othman, O.; Zhang, J.; Young, D. J.

In: Sains Malaysiana, Vol. 39, No. 2, 04.2010, p. 249-259.

Research output: Contribution to journalArticle

Othman, NK, Othman, O, Zhang, J & Young, DJ 2010, 'Kesan wap air terhadap pengoksidaan berkitar pada aloi Fe-Cr', Sains Malaysiana, vol. 39, no. 2, pp. 249-259.
Othman NK, Othman O, Zhang J, Young DJ. Kesan wap air terhadap pengoksidaan berkitar pada aloi Fe-Cr. Sains Malaysiana. 2010 Apr;39(2):249-259.
Othman, Norinsan Kamil ; Othman, O. ; Zhang, J. ; Young, D. J. / Kesan wap air terhadap pengoksidaan berkitar pada aloi Fe-Cr. In: Sains Malaysiana. 2010 ; Vol. 39, No. 2. pp. 249-259.
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AB - Fe-Cr alloys (Cr: 9-30 wt%) were subjected to cyclic oxidation in Ar-20%O2, Ar-20%O2-5%H2O and Ar-10%H 2-5%H2O (partial pressure of oxygen, p02 = 1.1× 10-16atm). Oxidation weight change measurement showed that in general, increasing Cr content reduced the oxidation rate. At Cr ≤. 17%Cr, breakaway oxidation was observed. However, for Cr ≥ 25%, the weight gain became very low due to formation of Cr2O3 layer. Adding 5%H2O to Ar-20%O2 accelerated the oxidation rate of alloys with Cr ≤. 20%. However, this accelerating effect did not appear in high chromium content alloys. XRD analysis showed that for alloys with Cr < 20%, wustite and spinel were formed at low p02, while at high p 02, hematite, iron oxide and spinel were formed. For high Cr content alloy only Cr2O3 was detected. Cross-section analysis showed that the spinel was formed by internal oxidation. The thickness and size of this internal oxide zone increased with increasing Cr content. A dense chromia layer was observed when the Cr content was above 25%. The oxides scales formed in water vapour were more porous and less compact than the scale formed in dry oxygen. The accelerating effect of water vapour on Fe-Cr oxidation is discussed in terms of gas-solid interactions.

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