Influence of water vapor on the oxidation behavior of aluminized coatings under low oxygen partial pressure |
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Authors: | Linlin Xing Yanjun Zheng Lishan Cui Maohu Sun Mingzeng Shao Guiwu Lu |
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Affiliation: | Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China |
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Abstract: | FeCrNi alloy after aluminizing was oxidized at 1000 °C in dry and humid (2.23 vol.% water) H2. Experimental results showed that H2 promotes the formation of θ alumina and its transformation to α alumina. The morphology of surface alumina coating does not change significantly, but the oxidation rate of the aluminized layer accelerates by the addition of water vapor. As a result, more cracks are found beneath the alumina layer when water vapor is present. The addition of water vapor seems having a favorable effect on the selective oxidation of Al and concentration of oxygen vacancy in the aluminized alloys. |
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Keywords: | A. Intermetallics A. Metal coatings B. Weight loss B. XRD C. High temperature corrosion |
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