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Title: Corrosion-resistant high-entropy alloys: A review

Abstract

Corrosion destroys more than three percent of the world’s gross domestic product. Therefore, the design of highly corrosion-resistant materials is urgently needed. By breaking the classical alloy-design philosophy, high-entropy alloys (HEAs) possess unique microstructures, which are solid solutions with random arrangements of multiple elements. The particular locally-disordered chemical environment is expected to lead to unique corrosion-resistant properties. In this review, the studies of the corrosion-resistant HEAs during the last decade are summarized. The corrosion-resistant properties of HEAs in various aqueous environments and the corrosion behavior of HEA coatings are presented. The effects of environments, alloying elements, and processing methods on the corrosion resistance are analyzed in detail. Finally, the possible directions of future work regarding the corrosion behavior of HEAs are suggested.

Authors:
 [1];  [2];  [3]
  1. Univ. of Science and Technology Beijing, Beijing (China); The Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Science and Technology Beijing, Beijing (China)
  3. The Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States); The University of Tennessee, Knoxville, TN, USA
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1356093
Alternate Identifier(s):
OSTI ID: 1362284
Grant/Contract Number:
FE0024054
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Metals
Additional Journal Information:
Journal Volume: 7; Journal Issue: 2; Journal ID: ISSN 2075-4701
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-entropy alloy; corrosion resistance; coating; aqueous environment

Citation Formats

Shi, Yunzhu, Yang, Bin, and Liaw, Peter. Corrosion-resistant high-entropy alloys: A review. United States: N. p., 2017. Web. doi:10.3390/met7020043.
Shi, Yunzhu, Yang, Bin, & Liaw, Peter. Corrosion-resistant high-entropy alloys: A review. United States. doi:10.3390/met7020043.
Shi, Yunzhu, Yang, Bin, and Liaw, Peter. Sun . "Corrosion-resistant high-entropy alloys: A review". United States. doi:10.3390/met7020043. https://www.osti.gov/servlets/purl/1356093.
@article{osti_1356093,
title = {Corrosion-resistant high-entropy alloys: A review},
author = {Shi, Yunzhu and Yang, Bin and Liaw, Peter},
abstractNote = {Corrosion destroys more than three percent of the world’s gross domestic product. Therefore, the design of highly corrosion-resistant materials is urgently needed. By breaking the classical alloy-design philosophy, high-entropy alloys (HEAs) possess unique microstructures, which are solid solutions with random arrangements of multiple elements. The particular locally-disordered chemical environment is expected to lead to unique corrosion-resistant properties. In this review, the studies of the corrosion-resistant HEAs during the last decade are summarized. The corrosion-resistant properties of HEAs in various aqueous environments and the corrosion behavior of HEA coatings are presented. The effects of environments, alloying elements, and processing methods on the corrosion resistance are analyzed in detail. Finally, the possible directions of future work regarding the corrosion behavior of HEAs are suggested.},
doi = {10.3390/met7020043},
journal = {Metals},
number = 2,
volume = 7,
place = {United States},
year = {Sun Feb 05 00:00:00 EST 2017},
month = {Sun Feb 05 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 10works
Citation information provided by
Web of Science

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  • Corrosion destroys more than three percent of the world’s gross domestic product. Therefore, the design of highly corrosion-resistant materials is urgently needed. By breaking the classical alloy-design philosophy, high-entropy alloys (HEAs) possess unique microstructures, which are solid solutions with random arrangements of multiple elements. The particular locally-disordered chemical environment is expected to lead to unique corrosion-resistant properties. In this review, the studies of the corrosion-resistant HEAs during the last decade are summarized. The corrosion-resistant properties of HEAs in various aqueous environments and the corrosion behavior of HEA coatings are presented. The effects of environments, alloying elements, and processing methods onmore » the corrosion resistance are analyzed in detail. Furthermore, the possible directions of future work regarding the corrosion behavior of HEAs are suggested.« less
  • For application of aluminum alloys to the power reactor, it would be desirable for them to have properties of high mechanical strength together with good corrosion resistance at reactor operating temperature. Preliminary work conducted to survey the effect of various alloying elements on corrosion resistance in high-purity water and on the mechanical strength of alloys at the temperature of 300 nif- C is reported. The alloying elements which proved to improve corrosion resistance of aluminium were iron, nickel, copper, silicon, palladium, and titanium, and which proved to increase strength at high temperature were copper, silicon, and magnesium. It was concludedmore » from these results that the alloy C-18 (1.2 Fe-1.4 Cu-1.2 Ni-1.1 Mg-Al) was the best alloy tested. (auth)« less
  • High-entropy alloys are formed by synthesizing five or more principal elements in equimolar or near equimolar concentrations. Microstructure of the CoCrCuFeNiAl{sub 0.5}B{sub x} (x = 0, 0.2, 0.6, 1) high-entropy alloys under investigation is composed of a mixture of disordered bcc and fcc phases and borides. These alloys were tested gravimetrically for their corrosion resistance in simulated syngas containing 0, 0.01, 0.1, and 1 % H{sub 2}S at 500 °C. The exposed coupons were characterized using XRD and SEM. No significant corrosion was detected at 500 °C in syngas containing 0 and 0.01 % H{sub 2}S while significant corrosion wasmore » observed in syngas containing 0.1 and 1 % H{sub 2}S. Cu{sub 1.96}S was the primary sulfide in the external corrosion scale on the low-boron high-entropy alloys, whereas FeCo{sub 4}Ni{sub 4}S{sub 8} on the high-boron high-entropy alloys. Multi-phase Cu-rich regions in the low-B high-entropy alloys were vulnerable to corrosive attack.« less
  • 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 pittingmore » 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.« less