Detail publikace

Interstitial nitrogen enhances corrosion resistance of an equiatomic CoCrNi medium-entropy alloy in sulfuric acid solution

MORAVČÍK, I. PEIGHAMBARDOUST, N. MOTALLEBZADEH, A. MORAVČÍKOVA DE ALMEIDA GOUVÊA, L. LIU, C. PRABHAKAR, J. DLOUHÝ, I. LI, Z.

Anglický název

Interstitial nitrogen enhances corrosion resistance of an equiatomic CoCrNi medium-entropy alloy in sulfuric acid solution

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

en

Originální abstrakt

The corrosion resistance of the equiatomic CoCrNi medium-entropy alloy (MEA) and its 0.5 atomic % nitrogen alloyed variant in 0.1 M H2SO4 solution was investigated and compared with that of the 316 L stainless steel as a reference material. All of the investigated materials showed single-phase face centered cubic (FCC) microstructures, and nitrogen was fully dissolved in the solid solution structure of the CoCrNi MEA. Both the nitrogen-free and nitrogen-doped MEAs showed significantly higher corrosion resistance (lower corrosion currents and rates) than the 316 L steel. Compared to the nitrogen-free CoCrNi, the interstitial nitrogen dissolved in solid solution causes a significant improvement in the pitting corrosion resistance of the CoCrNiN. Under the same testing condition, pitting corrosion was not observed in the CoCrNiN alloy, while the CoCrNi MEA and 316 L steel showed distinct pitting cavities. The better anti-corrosion performance of the CoCrNiN compared to that of the CoCrNi is correlated with a higher fraction of chromium oxide in the passive films.

Anglický abstrakt

The corrosion resistance of the equiatomic CoCrNi medium-entropy alloy (MEA) and its 0.5 atomic % nitrogen alloyed variant in 0.1 M H2SO4 solution was investigated and compared with that of the 316 L stainless steel as a reference material. All of the investigated materials showed single-phase face centered cubic (FCC) microstructures, and nitrogen was fully dissolved in the solid solution structure of the CoCrNi MEA. Both the nitrogen-free and nitrogen-doped MEAs showed significantly higher corrosion resistance (lower corrosion currents and rates) than the 316 L steel. Compared to the nitrogen-free CoCrNi, the interstitial nitrogen dissolved in solid solution causes a significant improvement in the pitting corrosion resistance of the CoCrNiN. Under the same testing condition, pitting corrosion was not observed in the CoCrNiN alloy, while the CoCrNi MEA and 316 L steel showed distinct pitting cavities. The better anti-corrosion performance of the CoCrNiN compared to that of the CoCrNi is correlated with a higher fraction of chromium oxide in the passive films.

Klíčová slova anglicky

Electrochemical properties; Medium–entropy alloys; Interstitials; Microalloying; Corrosion; Nanoindentation

Vydáno

01.02.2021

Nakladatel

Elsevier

Místo

ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, USA, NY, 10010-1710

ISSN

1044-5803

Ročník

172

Číslo

110869

Strany od–do

1–10

Počet stran

10

BIBTEX


@article{BUT167484,
  author="Igor {Moravčík} and Naeimeh Sadat {Peighambardoust} and Amir {Motallebzadeh} and Larissa {Moravčíková de Almeida Gouvea} and Chang {Liu} and J. Manoj {Prabhakar} and Ivo {Dlouhý} and Zhiming {Li},
  title="Interstitial nitrogen enhances corrosion resistance of an equiatomic CoCrNi medium-entropy alloy in sulfuric acid solution",
  year="2021",
  volume="172",
  number="110869",
  month="February",
  pages="1--10",
  publisher="Elsevier",
  address="ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, USA, NY, 10010-1710",
  issn="1044-5803"
}