Session: High-Temperature Materials and Corrosion Evaluation and Mitigation
Pre-oxidation Heat-Treatment on Ni-base Alumina-forming Alloys to Enhance their High-Temperature Corrosion Resistance (C2026-00078)
Thursday, March 19, 2026
9:30 AM - 10:00 AM Central
Location: 361 DE
Earn .5 PDH
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Most high-temperature alloys rely on the formation of a protective oxide scale, typically chromium oxide (chromia) or aluminum oxide (alumina), to resist high-temperature oxidation /corrosion. Alumina scales could provide superior protection to high temperature corrosion compared to chromia scales. For this purpose, it is critical to establish a protective alumina scale promptly when put into service. This can be challenging, especially in harsh environments, for some nominally alumina-forming alloys due to the slow kinetics of alumina scale formation. Pre-oxidation heat-treatments can help establish this protective alumina scale, and hence, ensure the expected superior high-temperature corrosion resistance of alumina-forming alloys. This paper presents results from pre-oxidation heat-treatment studies on Ni-base alumina-forming alloys, N07214, NiCoCrMoAl, and NiFeCrAl. The thickness and the microstructure of the alumina scales formed under different conditions were characterized to enable optimization of the pre-oxidation heat-treatment. High-temperature oxidation and corrosion tests were performed to evaluate the effectiveness of these pre-oxidation treatments in forming corrosion resistant alumina scales, and high-temperature corroison test results and analyses are presented for alumina-forming alloys with/without pre-oxidation treatment and chromia-forming alloys.
