Effect of Molybdenum on the Corrosion Behavior of High‐Entropy Alloys CoCrFeNi 2 and CoCrFeNi 2 Mo 0.25 under Sodium Chloride Aqueous Conditions

Rodriguez, Alvaro A.; Tylczak, Joseph H.; Gao, Michael C.; Jablonski, Paul D.; Detrois, Martin; Ziomek-Moroz, Margaret; Hawk, Jeffrey A.; Ares, ed., Alicia E.

doi:10.1155/2018/3016304

Effect of Molybdenum on the Corrosion Behavior of High‐Entropy Alloys CoCrFeNi ₂ and CoCrFeNi ₂ Mo _0.25 under Sodium Chloride Aqueous Conditions

Journal Article · Tue Mar 20 00:00:00 EDT 2018 · Advances in Materials Science and Engineering

DOI:https://doi.org/10.1155/2018/3016304· OSTI ID:1427334

Rodriguez, Alvaro A.; ; Gao, Michael C.; Jablonski, Paul D.; Detrois, Martin; Ziomek-Moroz, Margaret; Hawk, Jeffrey A.; Ares, ed., Alicia E.

The corrosion behavior of high‐entropy alloys (HEAs) CoCrFeNi ₂ and CoCrFeNi ₂ Mo _0.25 was investigated in 3.5 wt. percent sodium chloride (NaCl) at 25°C by electrochemical methods. Their corrosion parameters were compared to those of HASTELLOY® C‐276 (UNS N10276) and stainless steel 316L (UNS 31600) to assess the suitability of HEAs for potential industrial applications in NaCl simulating seawater type environments. The corrosion rates were calculated using corrosion current determined from electrochemical experiments for each of the alloys. In addition, potentiodynamic polarization measurements can indicate active, passive, and transpassive behavior of the metal as well as potential susceptibility to pitting corrosion. Cyclic voltammetry (CV) can confirm the alloy susceptibility to pitting corrosion. Electrochemical impedance spectroscopy (EIS) elucidates the corrosion mechanism under studied conditions. The results of the electrochemical experiments and scanning electron microscopy (SEM) analyses of the corroded surfaces revealed general corrosion on alloy CoCrFeNi ₂ Mo _0.25 and HASTELLOY C‐276 and pitting corrosion on alloy CoCrFeNi ₂ and stainless steel 316L.

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Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0004000

OSTI ID:: 1427334

Alternate ID(s):: OSTI ID: 1482378

Journal Information:: Advances in Materials Science and Engineering, Journal Name: Advances in Materials Science and Engineering Journal Issue: 1 Vol. 2018; ISSN 1687-8434

Publisher:: Hindawi Publishing CorporationCopyright Statement

Country of Publication:: Egypt

Language:: English

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