Mechanistic Studies on the Hydrogen Evolution and Permeation of Ultra-Strong Automotive Steel in Neutral Chloride Environments

Hwang, Eun Hye; Ryu, Seung Min; Kim, Sung Jin

doi:10.3740/mrsk.2018.28.7.428

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Under long-term immersion conditions, a high corrosion resistance could be attributed primarily to the corrosion products with protective characteristics, formed on the surface. A previous study 33 reported that the corrosion scale formed on high-strength carbon steel exposed to a neutral solution containing chloride ions has a bi-layer structure composed mainly of an adhesive inner-layer of Fe 3 O 4 and a non-adhesive outer-layer of γ-FeOOH. Although 1.2 wt.% Ni was added to the ultra-strong steel, the nature of the corrosion scale formed on the surface was not changed and the difference in the structure of the inner scale could not be identified by X-ray diffraction (XRD), as shown in Supplementary Fig.…”

Section: Corrosion Tests and An Analysis Of The Corrosion Products Fomentioning

confidence: 99%

Inhibiting hydrogen embrittlement in ultra-strong steels for automotive applications by Ni-alloying

et al. 2019

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With the stricter international regulations on CO 2 emissions, fuel economy, and auto-safety, the application of novel materials with both higher strength and lower weight is becoming a major technical issue in automotive industries. Among the various lightweight concepts, ultra-strong GIGA STEEL with a tensile strength of more than 2 GPa is a major breakthrough in light of the remarkable weight reduction of vehicle without a decrease in auto-safety. Despite the outstanding mechanical performance, hydrogen embrittlement induced by aqueous and/or atmospheric corrosion is a serious problem that has restricted the application of steel to auto-parts. This study reports that such a critical challenge can be overcome by Ni-alloying, which leads to a lower cathodic reduction rate on the steel surface and slower H-infusion kinetics in the steel matrix. In contrast to the beneficial effects of Ni-alloying, conflicting results can be obtained when steel with a higher Ni content (≥1 wt.%) is exposed to neutral-corrosive environments, but the results have not been verified using conventional metallurgical approaches. This paper proposes a mechanism for these conflicting results, and provides a new and economic strategy for superior resistance to corrosion-induced hydrogen embrittlement, by making optimal use of Ni-alloying of ultra-strong steel.

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Section: Corrosion Tests and An Analysis Of The Corrosion Products Fomentioning

confidence: 99%

Inhibiting hydrogen embrittlement in ultra-strong steels for automotive applications by Ni-alloying

et al. 2019

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Adverse effects of Ni on the mechanical and corrosion-induced hydrogen embrittlement properties of ultra-strong giga steel used for automotive applications

et al. 2020

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Effect of Minor Alloying Elements (C, Ni, Cr, Mo) on the Long-Term Corrosion Behaviors of Ultrahigh-Strength Automotive Steel Sheet in Neutral Aqueous Environment

Bang¹,

Park²,

Seong³

et al. 2022

Korean J. Met. Mater.

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This study examined the effects of minor alloying elements (C, Ni, Cr, and Mo) on the long-term corrosion behaviors of ultrahigh-strength automotive steel sheets with a tensile strength of more than 1800 MPa. A range of experimental and analytical results showed that the addition of Ni, Cr, and Mo decreased the corrosion current density and weight loss in electrochemical and immersion tests, respectively, in a neutral aqueous condition. This suggests that the minor addition of elements to steel can result in improved corrosion resistance even for long-term immersion periods. This is closely associated with the formation of thin and stable corrosion scale on the surface, which was enriched with the alloying elements (Ni, Cr, and Mo). On the other hand, their beneficial effects did not persist during the prolonged immersion periods in steel with a higher C content, suggesting that the beneficial effects of the minor addition of Ni, Cr, and Mo were overridden by the detrimental effects of a higher C content as the immersion time was increased. Based on these results, lower C and the optimal use of Ni, Cr, and Mo are suggested as a desirable alloy design strategy for developing ultrahigh-strength steel sheets that can be exposed frequently to a neutral aqueous environment.

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Mechanistic Studies on the Hydrogen Evolution and Permeation of Ultra-Strong Automotive Steel in Neutral Chloride Environments

Cited by 3 publications

References 17 publications

Inhibiting hydrogen embrittlement in ultra-strong steels for automotive applications by Ni-alloying

Inhibiting hydrogen embrittlement in ultra-strong steels for automotive applications by Ni-alloying

Adverse effects of Ni on the mechanical and corrosion-induced hydrogen embrittlement properties of ultra-strong giga steel used for automotive applications

Effect of Minor Alloying Elements (C, Ni, Cr, Mo) on the Long-Term Corrosion Behaviors of Ultrahigh-Strength Automotive Steel Sheet in Neutral Aqueous Environment

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