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Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy
Wang Di1,2; Wang Dong2; Xie Guang2; Wang Li2; Dong Jiasheng2; Chen Lijia1
Corresponding AuthorWang Di(diwang@imr.ac.cn)
2021-06-01
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:6Pages:780-790
AbstractPt-Al coating has been widely used in engine rotor blades because of its ability to improve the oxidation and hot corrosion resistance of Ni-based superalloys. However, the effect exerted by Pt on S and other refractory elements, as well as the rupture mechanisms, is under debate. To investigate the influence of Pt-Al coating on the corrosion resistance of single-crystal superalloy at high temperature, the hot corrosion test utilized Na2SO4 salt coated on the surface of the Pt-Al coating samples and the uncoated ones were carried out at 900 degrees C, respectively. Using several techniques, such as XRD, SEM, EDS, and EPMA, the influence of Pt-Al coating on the hot corrosion behaviors of a Ni-based single-crystal superalloy was analyzed. Moreover, the hot corrosion kinetics, hot corrosion products, and microstructure evolution during the process were analyzed. The results reveal that the hot corrosion resistance of the substrate alloy was enhanced by Pt-Al coating. The hot corrosion rate of the Pt-Al coating sample was lower than that of the uncoated one. Thus, it can be inferred that Pt-Al coating exhibited better hot corrosion resistance. Pt prevented the diffusion of S into the beta-(Ni, Pt)Al phase. The S atom was present at the oxide-metal interface, which reduced the hot corrosion rate of the substrate alloy. The presence of Pt in the beta-(Ni, Pt)Al obstructed the great mass of Ta in the inter diffusion zone, which led to the diffusion of only a small quantity of Ta atoms into the oxide, and reduced the formation of Ta2O5. Finally, Pt-Al coating was also found to restrain to some extent the void formation at the oxide-metal interface.
KeywordPt-Al coating hot corrosion single-crystal superalloy Ni-based alloy
Funding OrganizationNational Key Research and Development Program of China ; National Science and Technology Major Project ; National Natural Science Foundation of China
DOI10.11900/0412.1961.2020.00246
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0701403] ; National Science and Technology Major Project[2017-VI-0019-0091] ; National Science and Technology Major Project[2017-VI-0003-0073] ; National Science and Technology Major Project[2017-VI-00010070] ; National Natural Science Foundation of China[51771204] ; National Natural Science Foundation of China[U1732131] ; National Natural Science Foundation of China[51671196] ; National Natural Science Foundation of China[91860201] ; National Natural Science Foundation of China[51631008]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000657818600008
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160376
Collection中国科学院金属研究所
Corresponding AuthorWang Di
Affiliation1.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China
2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wang Di,Wang Dong,Xie Guang,et al. Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy[J]. ACTA METALLURGICA SINICA,2021,57(6):780-790.
APA Wang Di,Wang Dong,Xie Guang,Wang Li,Dong Jiasheng,&Chen Lijia.(2021).Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy.ACTA METALLURGICA SINICA,57(6),780-790.
MLA Wang Di,et al."Influence of Pt-Al Coating on Hot Corrosion Resistance Behaviors of a Ni-Based Single-Crystal Superalloy".ACTA METALLURGICA SINICA 57.6(2021):780-790.
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