HOT CORROSION BEHAVIOR OF A (NiCoCrAlYSiB+AlSiY) COMPOSITE COATING

doi:10.3724/SP.J.1037.2012.00031

Acta Metall Sin

2012, Vol. 48

Issue (4): 461-468 DOI: 10.3724/SP.J.1037.2012.00031

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HOT CORROSION BEHAVIOR OF A (NiCoCrAlYSiB+AlSiY) COMPOSITE COATING

LU Xuyang, YU Daqian, JIANG Sumeng, LIU Shanchuan, GONG Jun, SUN Chao

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016

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LU Xuyang, YU Daqian, JIANG Sumeng, LIU Shanchuan, GONG Jun, SUN Chao. HOT CORROSION BEHAVIOR OF A (NiCoCrAlYSiB+AlSiY) COMPOSITE COATING. Acta Metall Sin, 2012, 48(4): 461-468.

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Abstract Two kinds of the coatings, the conventional NiCoCrAlYSiB coating and the composite coating (NiCoCrAlYSiB+AlSiY), were prepared using arc ion plating (AIP) on the Ni base single crystal superalloy substrate. Comparative studies of the hot corrosion behaviors of the substrate and two different coatings in Na₂SO₄ + K₂SO₄ and Na₂SO₄ + NaCl at 900 and 700 ℃ were investigated. The results showed that, during the hot corrosion at 900 ℃, NiO was formed on the surface of the substrate while Cr₂O₃ was formed on the surface of the conventional coating with the formation of internal oxidation and sulfidation, and Al₂O₃ was formed on the surface of the composite coating. Slighter internal oxidation appeared in the outer layer of the composite coating. The composite coating contained sufficient Al reservoirs to supply the formation and repair of Al₂O₃. During the hot corrosion at 700 ℃, NiO was formed on the surface of the substrate and Cr₂O₃ was formed on the surface of the conventional coating with severe internal oxidation, while internal oxidation appeared in the outer layer of the composite coating. The Cr-enriched inner layer did not suffer from corrosion damage, which can improve the corrosion resistance of the composite coating.

Key words: arc ion plating (AIP) composite coating hot corrosion

Received: 13 January 2012

Fund:

National Basic Research Program of China;National Natural Science Foundation of China

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00031 OR https://www.ams.org.cn/EN/Y2012/V48/I4/461

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