Hot Corrosion Behavior of a Cr-Modified Aluminide Coating on a Ni-Based Superalloy  

作　　者：Duoli Wu Sumeng Jiang Qixiang Fan Jun Gong Chao Sun 

机构地区：[1]State Key Laboratory of Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences

出　　处：《Acta Metallurgica Sinica(English Letters)》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)

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.

关 键 词：Arc ion plating Pack cementation aluminizing Superalloy Cr-modified aluminide coating Hot corrosion 

分 类 号：TG174[金属学及工艺—金属表面处理]