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Hot Corrosion Behavior of a Cr-Modified Aluminide Coating on a Ni-Based Superalloy 被引量:5

Hot Corrosion Behavior of a Cr-Modified Aluminide Coating on a Ni-Based Superalloy
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摘要 A Cr-modified aluminide coating is prepared on a Ni-based superalloy using arc ion plating and subsequent pack cementation aluminizing.Hot corrosion behavior of the Cr-modified aluminide coating exposed to molten Na2SO4/K2SO4(3:1) or Na2SO4/NaCl(3:1) salts at 900 °C in static air are evaluated as well as the aluminide coating.The results indicate that compared with the aluminide coating,the anti-corrosion properties of the Cr-modified aluminide coating in the both salts are improved,which should be attributed to the beneficial effect of the Cr in the coating.The corrosion mechanism of the Cr-modified aluminide coating,especially the role of Cr in the mixture salt corrosion,is discussed. A Cr-modified aluminide coating is prepared on a Ni-based superalloy using arc ion plating and subsequent pack cementation aluminizing.Hot corrosion behavior of the Cr-modified aluminide coating exposed to molten Na2SO4/K2SO4(3:1) or Na2SO4/NaCl(3:1) salts at 900 °C in static air are evaluated as well as the aluminide coating.The results indicate that compared with the aluminide coating,the anti-corrosion properties of the Cr-modified aluminide coating in the both salts are improved,which should be attributed to the beneficial effect of the Cr in the coating.The corrosion mechanism of the Cr-modified aluminide coating,especially the role of Cr in the mixture salt corrosion,is discussed.
出处 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2014年第4期627-634,共8页 金属学报(英文版)
基金 financially supported by the National Natural Science Foundation of China (No.51001106) National Basic Research Program of China (No.2012CB625100)
关键词 Arc ion plating Pack cementation aluminizing Superalloy Cr-modified aluminide coating Hot corrosion Arc ion plating Pack cementation aluminizing Superalloy Cr-modified aluminide coating Hot corrosion
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