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Open AccessArticle

Destructive Effect of Water Vapour on an In Situ Diffusion Barrier Layer within an Aluminide Coating on IN738 Alloy

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
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Coatings 2018, 8(10), 332; https://doi.org/10.3390/coatings8100332
Received: 19 August 2018 / Revised: 18 September 2018 / Accepted: 19 September 2018 / Published: 21 September 2018
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection in Extreme Environments)
High-temperature interdiffusion within a hot-dipped aluminide (Al-10 wt.% Si) coating on an IN738 superalloy was investigated at 1050 °C in air and in air plus water vapour. The resulting morphology of in situ diffusion barrier layer (DBL) within the aluminide coating is affected by oxidizing atmospheres; DBL can effectively retard the interdiffusion of aluminium within the coating. The location of the in situ DBL is governed by the partial pressure of oxygen at different depths from the oxide scales in both atmospheres. Meanwhile, the diffusion fluxes of different elements led to DBLs with different morphologies in the aluminide coating on the Ni-based alloy. View Full-Text
Keywords: metal coatings; superalloys; scanning electron microscopy (SEM); X-ray diffraction (XRD); selective oxidation metal coatings; superalloys; scanning electron microscopy (SEM); X-ray diffraction (XRD); selective oxidation
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MDPI and ACS Style

Li, C.; Song, P.; Chen, K.; He, X.; Yu, X.; Lu, J. Destructive Effect of Water Vapour on an In Situ Diffusion Barrier Layer within an Aluminide Coating on IN738 Alloy. Coatings 2018, 8, 332.

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