Oxidation and Corrosion Resistance of NiCr-Re and NiCr-Re-Al2O3 Materials Fabricated by Spark Plasma Sintering

Metals

Jana Hovancova¹  Vitaliy Antal²  Ivan Shepa³  Jan Dusza³  Marek Vojtko³  Erika Mudra³  Agata Strojny-Nędza⁴  Marcin Chmielewski⁴  Katarzyna Pietrzak⁴  Kamil Kaszyca⁴ 

[1] Department of Physical Chemistry, P.J. Šafárik University in Košice, 11 Moyzesova Str., 040 01 Košice, Slovakia;Institute of Experimental Physics of the Slovak Academy of Sciences, 47 Watsonova Str., 040 01 Kosice, Slovakia;Institute of Materials Research, Slovak Academy of Sciences, 47 Watsonova Str., 040 01 Košice, Slovakia;Łukasiewicz Research Network Institute of Electronic Materials Technology, 133 Wolczynska Str., 01-919 Warsaw, Poland;

关键词: NiCr;    rhenium;    aluminium oxide;    metal matrix composites;    oxidation;    corrosion;   

DOI  :  10.3390/met10081009

来源: DOAJ

【 摘 要 】

The thermal and oxidation resistance of elements found in the combustion boilers of power generation plants are some of the most important factors deciding their effectiveness. This paper shows the experimental results of the influence of NiCr-based material composition on the microstructure and phase changes occurring during the oxidation and corrosion process. NiCr alloy was modified by the addition of rhenium and aluminum oxide. Materials were densified using the spark plasma sintering method at a sintering temperature of 1050 °C. Oxidation tests conducted up to 1100 °C under synthetic airflow revealed the formation of a thin Cr₂O₃ layer protecting the material against in-depth oxidation. Results of electrochemical corrosion in a 0.5 M NaCl solution indicated a positive role of Re and Al₂O₃ addition, confirmed by low corrosion current density values in comparison to the other reference materials. According to the provided positive preliminary test results, we can conclude that a NiCr-Re-Al₂O₃ system in coating form was successfully obtained by the plasma spraying method.

【 授权许可】

Unknown