Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H2SO4

Pao, Li; Muto, Izumi; Sugawara, Yu

doi:10.1016/j.corsci.2021.109748

Cited by 37 publications

(13 citation statements)

References 56 publications

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“…Our previous studies have revealed that CoCrFeNiMn HEA exhibits passivation characteristic in a simulated alkaline soil environment [30,32]. In addition, numerous reports have shown that equiatomic CoCrFeNiMn HEA presents a passive state in various solutions, involving strong acids and industrial environment [43,55]. Known from the above results, the electrochemical corrosion results of CoCrFeNiMn alloy in 3.5 wt-% NaCl solution exhibit activation characteristic and poor anti-corrosion performance.…”

Section: Discussionmentioning

confidence: 79%

The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

Zhang

Zhu

Yuan

et al. 2022

Corrosion Engineering, Science and Technology

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The corrosion behaviour of equiatomic CoCrFeNi and CoCrFeNiMn high entropy alloys manufactured by the vacuum arc melting were studied in 3.5 wt-% NaCl solution. And the reasons for the differences in corrosion resistance were investigated in terms of microstructure, electrochemical behaviour and oxide film. The results show that the two alloys exhibit different corrosion characteristics, with CoCrFeNi alloy displaying typical passivation characteristics and CoCrFeNiMn alloy exhibiting activation behaviour. The CoCrFeNi HEA with compact and protective passive film has lower corrosion current density, larger film resistance and polarisation resistance, meaning a lower corrosion rate and superior corrosion resistance compared with those of CoCrFeNiMn alloy. Moreover, CoCrFeNiMn alloy forms a discontinuous and loose corrosion product film with higher Mn content and lower contents of Cr, Fe and Co compared to the matrix, which decreases its protection performance. The addition of Mn changes the electrochemical behaviour, and higher Mn oxides/hydroxides within oxide film are unfavourable to forming a stable passive film.

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Section: Discussionmentioning

confidence: 79%

The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

Zhang

Zhu

Yuan

et al. 2022

Corrosion Engineering, Science and Technology

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“…A constant phase-angle element, also known as a CPE, is used in place of a traditional capacitor so that flaws in capacitive components, such as surface inhomogeneities, may be taken into consideration. If the value of the charge transfer resistance, or R3, is lowered, then a greater number of electrons and ions will be able to flow through the passivation layer created by the alloy, which will result in a reduction in the alloy’s resistance to corrosion [ 36 , 37 , 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

A Lightweight AlCrTiV0.5Cux High-Entropy Alloy with Excellent Corrosion Resistance

Peng

Luo

et al. 2023

Materials

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Lightweight high-entropy alloys (HEAs) are a new class of low-density, high strength-to-weight ratio metallic structural material. Understanding their corrosion behavior is crucial for designing microstructures for their practical applications. This work investigates the electrochemical corrosion behavior of lightweight HEAs AlCrTiV0.5Cux (x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0) in a 0.6 M NaCl solution. These HEAs were produced by vacuum arc melting. In contrast to 304L stainless steel, all of the alloys exhibited lower current density levels caused by self-corrosion, with AlCrTiV0.5 demonstrating the highest corrosion resistance (0.131 μA/cm2). Corrosion resistance decreased along with the content of copper because copper segregation accelerated local corrosion throughout the alloy.

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“…Manganese, Cr, and O were detected in the left side of the inclusions This inclusion was determined to be a Mn-Cr oxide and MnS complex. In stainless steels and related metals, MnCr 2 O 4 is sometimes formed, and MnS is generated at the periphery of oxide inclusions 53,54 . In this work, similar S-containing inclusions were observed in the solution-treated specimens.…”

Section: Inclusion Characterizationmentioning

confidence: 99%

Micro-electrochemical insights into pit initiation site on aged UNS S32750 super duplex stainless steel

et al. 2023

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An aging treatment of UNS S32750 super duplex stainless steel at 1173 K for 1.0 ks produced σ and secondary austenite (γ2) phases in the α and γ phase boundary regions. Small amount of Mn-Cr oxide and MnS complex inclusions were present in the steel. No pitting was observed during the potentiodynamic polarization of a small area (200 × 200 µm) without inclusions in 1 M MgCl2 at 348 K. Because the electrode area included α, γ, σ, and γ2 phases, these phases and their boundaries alone could not act as initiation sites for pitting. The electrode area size was gradually reduced from 3 × 3 mm to 1 × 1 mm, and pitting corrosion was observed to occur at the Mn-Cr oxide and MnS complex inclusions in a region that appeared to be the γ2 phase near the σ phase.

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Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H2SO4

Cited by 37 publications

References 56 publications

The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

The effect of Mn addition on corrosion behaviour of equiatomic CoCrFeNi high entropy alloys in NaCl solution

A Lightweight AlCrTiV0.5Cux High-Entropy Alloy with Excellent Corrosion Resistance

Micro-electrochemical insights into pit initiation site on aged UNS S32750 super duplex stainless steel

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