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Cyclic oxidation behaviour of a Ni‐Mo‐Cr alloy at 800°C

A. Ul‐Hamid (Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia)
H.M. Tawancy (Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia)
A.I. Mohammed (Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia)
S.S. Al‐Jaroudi (Saudi Aramco, Tanajib, Saudi Arabia)
N.M. Abbas (Center for Engineering Research, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 1 October 2004

863

Abstract

The oxidation behaviour of a wrought Ni‐Mo‐Cr alloy was studied under thermal cyclic conditions in air at 800°C for exposure periods of up to 1,000 h. The morphologies, microstructures and compositions of the oxide scales were characterized by scanning electron microscopy, energy dispersive X‐ray spectroscopy and X‐ray diffraction. Oxidation kinetics were determined by weight gain measurements. Results show that steady‐state oxidation was achieved within 1 h of exposure while partial scale spalling was observed after 400 h. The alloy grain boundaries intersecting the alloy surface showed preferential oxidation. They became depleted in Ni and enriched in Mo and Cr during transient oxidation. The scale initially formed at the surface was NiO which grew outwardly and laterally to cover the entire alloy. Upon continued oxidation, the scale developed into an outer NiO layer and an inner Cr2O3 layer while the presence of NiMoO4 was also observed within the scale.

Keywords

Citation

Ul‐Hamid, A., Tawancy, H.M., Mohammed, A.I., Al‐Jaroudi, S.S. and Abbas, N.M. (2004), "Cyclic oxidation behaviour of a Ni‐Mo‐Cr alloy at 800°C", Anti-Corrosion Methods and Materials, Vol. 51 No. 5, pp. 339-347. https://doi.org/10.1108/00035590410554900

Publisher

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Emerald Group Publishing Limited

Copyright © 2004, Emerald Group Publishing Limited

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