Internal oxidation and phase transformations of multi-phase Fe–Ni–Al and Fe–Ni–Al–Cr alloys induced by KCl corrosion |
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| Authors: | TJ Pan YS Li Q Yang RF Feng A Hirose |
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| Affiliation: | aSchool of Materials Science and Engineering, Changzhou University, Changzhou, China;bPlasma Physics Laboratory, University of Saskatchewan, Saskatoon SK, Canada S7N 5E2;cDepartment of Mechanical Engineering, University of Saskatchewan, Saskatoon SK, Canada S7N 5A9;dCanadian Light Source, University of Saskatchewan, Saskatoon SK, Canada S7N 0X4 |
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| Abstract: | The corrosion of two multiphase Fe–Ni–Al and Fe–Ni–Al–Cr alloys is studied at 650 °C in KCl-contaminated air. The oxidation rate of the alloys in air alone is low. When KCl is introduced, the corrosion is accelerated, producing a thick external scale of iron oxides, an intermediate layer of spinel, and a region of internal oxidation of Al. Potassium chromate is detected on Fe–Ni–Al–Cr surface that accounts for the degradation of protective chromia. An Al-depleted single phase region is observed in the front of the internal oxidation, due to the selective consumption of Al via an “active oxidation” process. |
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| Keywords: | A Alloy B Raman spectroscopy C Hot corrosion C Chlorination C Internal oxidation |
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