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

Abstract

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.

Authors:

Rodriguez, Alvaro A. ^[1]; Tylczak, Joseph H.  ^[2];

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Gao, Michael C. ^[3]; Jablonski, Paul D. ^[2]; Detrois, Martin ^[3]; Ziomek-Moroz, Margaret ^[2]; Hawk, Jeffrey A. ^[2]

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+ Show Author Affiliations

1. National Energy Technology Laboratory, 1450 Queen Ave. SW, Albany, OR 97321, USA, ORISE, Oak Ridge, TN, USA
2. National Energy Technology Laboratory, 1450 Queen Ave. SW, Albany, OR 97321, USA, U.S. Department of Energy, Washington, DC, USA
3. National Energy Technology Laboratory, 1450 Queen Ave. SW, Albany, OR 97321, USA, AECOM, Los Angeles, CA, USA

Publication Date:

Mon Jan 01 00:00:00 EST 2018

Research Org.:

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

Sponsoring Org.:

USDOE

OSTI Identifier:

1427334

Alternate Identifier(s):

OSTI ID: 1482378

Grant/Contract Number:  

FE0004000

Resource Type:

Published Article

Journal Name:

Advances in Materials Science and Engineering

Additional Journal Information:

Journal Name: Advances in Materials Science and Engineering Journal Volume: 2018; Journal ID: ISSN 1687-8434

Publisher:

Hindawi Publishing Corporation

Country of Publication:

Egypt

Language:

English

Subject:

36 MATERIALS SCIENCE