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Cyclic Oxidation and Hot Corrosion Behavior of Y/Cr-Modified Aluminide Coatings Prepared by a Hybrid Slurry/Pack Cementation Process

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Abstract

Y/Cr-modified aluminide coatings were prepared on a Ni-base superalloy K417G using a hybrid slurry/pack cementation process. The coatings consisted of a NiAl layer with dissolved Cr and Y. The microstructures and high temperature corrosion behavior of the coatings were characterized using SEM/EDS, XRD, EPMA and SIMS. Cyclic oxidation tests at 1000 °C for 200 h were carried out in air. The results indicated that specimens coated by either the Y/Cr-modified aluminide coatings or the simple aluminide coatings exhibited better oxidation resistances than the cast alloy. The Y/Cr-modified aluminide coatings possessed lower oxidation rates and better degradation resistance than the simple aluminide coatings during the oxidation tests. Furthermore, the alumina scales formed on the Y/Cr-modified aluminide coatings were considerably more adherent than those on the simple aluminide coatings during the thermal cycling. The hot corrosion tests consisted of applying a 25 wt% K2SO4 +75 wt% Na2SO4 salt mixture to the specimens and exposing at 900 °C. The Y/Cr-modified aluminide coatings showed the longest service life compared with the cast alloy and aluminide coatings, which suffered significant sulfur attack. After 200 h, the Y/Cr-modified aluminide coatings were still protective.

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Acknowledgments

This project is financially supported by the Knowledge Innovation Program of the Chinese Academy of Sciences, Grant No. YYYJ-0912.

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Authors and Affiliations

  1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Science, Wencui Road 62#, Shenyang City, 110016, People’s Republic of China

    **tao Lu, Shenglong Zhu & Fuhui Wang

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  1. **tao Lu
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  2. Shenglong Zhu
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  3. Fuhui Wang
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Correspondence to **tao Lu.

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Lu, J., Zhu, S. & Wang, F. Cyclic Oxidation and Hot Corrosion Behavior of Y/Cr-Modified Aluminide Coatings Prepared by a Hybrid Slurry/Pack Cementation Process. Oxid Met 76, 67–82 (2011). https://doi.org/10.1007/s11085-010-9228-0

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  • DOI: https://doi.org/10.1007/s11085-010-9228-0

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