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Isothermal Oxidation Behavior of Chromia-Forming and Alumina-Forming Nickel-Base Alloys in Dry and H

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Nickel-base alloys are used in high temperature environments such as heat exchangers and land-based gas turbines where oxidation becomes a significant issue. To mitigate oxidation these alloys contain chromium and aluminum to form protective oxide layers. In dry air the behavior of chromia- and alumina-forming alloys can be predictable. However several high temperature applications contain a significant amount of water vapor which in turn can lead to enhanced corrosion. The effects of water vapor are not completely understood. Hence a comparative study of the oxidation behavior of two nickel-base alloys – UNS N06230 and UNS N07214 - in dry and wet air was undertaken.  UNS N06230 a chromia former and UNS N07214 an alumina former were oxidized at 1000°C in dry and wet (15 volume% H2O) air for times of 1 minute 10 minutes 1 hour 5 hours 10 hours and 100 hours using thermogravimetric analysis. The coupons were characterized using X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. UNS N06230 performed better overall in wet air when compared to UNS N07214. Mechanisms for this difference will be discussed.

Product Number: 51319-13520-SG
Author: Nicholas Ury
Publication Date: 2019
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