Oxidation Behavior of HVAF-Sprayed NiCoCrAlY Coating in H₂–H₂O Environment

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• 作者：E. Sadeghimeresht ; H. Hooshyar ; N. Markocsan ; S. Joshi ; P. Nylén
• 关键词：HVAF ; MCrAlY coating ; Oxidation ; Water vapor ; Oxygen partial pressure
• 刊名：Oxidation of Metals
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：86
• 期：3-4
• 页码：299-314
• 全文大小：2,308 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Inorganic Chemistry
  Tribology, Corrosion and Coatings
  Metallic Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-4889
• 卷排序：86

文摘

Isothermal oxidation behavior of an HVAF-sprayed NiCoCrAlY coating on AISI 304L was studied in an Ar–10 %H₂–20 %H₂O environment at 600 °C. Techniques such as BIB/SEM, EDS, and XRD were used to comprehensively characterize the coating and the coating/substrate interface to investigate the oxidation mechanisms. Results were also compared with those obtained from an uncoated AISI 304L substrate. The alumina-forming NiCoCrAlY coating was found to exhibit superior oxidation behavior due to the formation of a slow-growing and protective Al₂O₃ scale, while the chromia-forming bare 304L substrate lost its protective capability due to the formation of a duplex [Fe₃O₄ on (Fe,Cr)₃O₄ spinel oxide] corrosion product layer.