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A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion.

ABSTRACT: Strong and ductile materials that have high resistance to corrosion and hydrogen embrittlement are rare and yet essential for realizing safety-critical energy infrastructures, hydrogen-based industries, and transportation solutions. Here we report how we reconcile these constraints in the form of a strong and ductile CoNiV medium-entropy alloy with face-centered cubic structure. It shows high resistance to hydrogen embrittlement at ambient temperature at a strain rate of 10^-4 s^-1, due to its low hydrogen diffusivity and the deformation twinning that impedes crack propagation. Moreover, a dense oxide film formed on the alloy's surface reduces the hydrogen uptake rate, and provides high corrosion resistance in dilute sulfuric acid with a corrosion current density below 7 μA cm^-2. The combination of load carrying capacity and resistance to harsh environmental conditions may qualify this multi-component alloy as a potential candidate material for sustainable and safe infrastructures and devices.

SUBMITTER: Luo H

PROVIDER: S-EPMC7299985 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion.

Luo Hong H Sohn Seok Su SS Lu Wenjun W Li Linlin L Li Xiaogang X Soundararajan Chandrahaasan K CK Krieger Waldemar W Li Zhiming Z Raabe Dierk D

Nature communications 20200617 1

Strong and ductile materials that have high resistance to corrosion and hydrogen embrittlement are rare and yet essential for realizing safety-critical energy infrastructures, hydrogen-based industries, and transportation solutions. Here we report how we reconcile these constraints in the form of a strong and ductile CoNiV medium-entropy alloy with face-centered cubic structure. It shows high resistance to hydrogen embrittlement at ambient temperature at a strain rate of 10<sup>-4</sup> s<sup>-1 ...[more]

PMID: 32555177

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Project description:The corrosion characteristics and passive behavior of as-cast Ni40Fe30Co20Al10 medium-entropy alloy (MEA) fabricated by the vacuum arc melting technique were investigated in 3.5 wt.% NaCl, 0.5 M HCl, and 0.5 M H2SO4 solutions. Although the impact of different solutions on the corrosion current density was not pronounced, the corrosion potential values of MEAs in H2SO4, HCl and NaCl solutions were -0.37, -0.58 and -1.16 V, respectively, indicating that the resistance to general corrosion in acidic solutions becomes strengthened. Through electrochemical passive region tests, surface morphology analysis and ICP testing, it was found that, due to the high-entropy effect and uniform single-phase structure, an optimized and stable passive film formed specifically in the Cl--containing solution. The ion concentrations in the passive region of MEA in NaCl solution were an order of magnitude lower than those of other two samples, suggesting that its passive film formed exhibits a more prominent capacity to inhibit metal dissolution. Compared with electrochemical reactions in H2SO4 and HCl solutions, MEA shows enhanced pitting resistance in NaCl solution, which could be attributed to the presence of abundant unoxidized metal atoms (51.9 at.%). Al is identified as the primary component in the formation of the passive film, which plays a protective role for the Co-rich interior of the MEA. Although MEA has a relatively high passivation current in the H2SO4 solution, it has the widest passivation zone (1.87 V), indicating the optimized stability of the formed passive film. Moreover, it displays a high level of resistance to pitting corrosion in the solution containing only H+- and free of Cl-. Both the MEAs show significant grain-boundary corrosion in H2SO4 and HCl solutions. Among them, the MEA in HCl experiences more severe intragranular corrosion. Notably, MEA withstands the erosion of a single Cl-- or H+-containing solution, but it is unable to resist the synergistic effect of a solution containing both H+ and Cl-.

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A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion.

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A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion.

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