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Communication Dans Un Congrès Année : 2022

AESEC-EIS: Elementally resolved dissolution kinetics of a NiCrFeMn(Mo)Co system

Kevin Ogle

Résumé

The overall corrosion mechanism of an alloy depends on the specific chemical and electrochemical properties of each alloying elements and their interactions with each other. To this end, elementally resolved dissolution kinetics of nominally pure metals, components of Ni-based alloys and multi-principal element alloys (MPEAs), were investigated via atomic emission spectroelectrochemistry (AESEC) coupled with electrochemical impedance spectroscopy (EIS). Elementally resolved electrochemical parameters, e.g., elemental Tafel slopes, were determined using the AESEC-EIS methodology. The AESEC-EIS analysis for pure metals on the elemental dissolution kinetics, elemental contribution to the impedance, and interfacial properties will be used to as input parameters to understand the dissolution kinetics of Ni-based alloys and Ni-Fe-Cr-(Mn)-Co MPEAs. Fig. 1(a) shows AESEC-linear sweep voltammetry (AESEC-LSV) of pure Ni, Cr, Fe and Co measured in deaerated 2 M H2SO4 solution with 0.5 mV s-1 scan rate. A near congruent Ni dissolution was observed in the active potential domain. Less soluble Cr-based species formation is indicated in a relatively large potential domain (0.0 V < E < 1.0 V vs. SCE) in that the total current density (je) was higher than the equivalent Cr dissolution current density (jCr). Fe showed an onset dissolution potential (-0.68 V vs. SCE) more negative than the potential at j = 0 (Ej=0), and je > jFe for E > Ej=0 indicating a Fe-based less soluble species formation in this potential domain. Co showed a complex dissolution mechanism as a function of potential with 4 to 6 orders of magnitude jCo and je difference. An example of AESEC-EIS is given in Fig. 1(b) in the case of pure Ni showing an in-phase Ni dissolution rate with the applied sinusoidal potential, and resulting je. The Bode plots for pure Ni, Cr, Fe, Mo, and Co are compared with an MPEA in Fig. 1(c). The elemental dissolution kinetics using AESEC-EIS methodology will be discussed for the pure metals as well as Ni-Cr, Ni-Cr-Mo alloys and Ni-Fe-Cr-(Mn)-Co MPEAs.

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Dates et versions

hal-03980570 , version 1 (09-02-2023)

Identifiants

  • HAL Id : hal-03980570 , version 1

Citer

Junsoo Han, Kevin Ogle. AESEC-EIS: Elementally resolved dissolution kinetics of a NiCrFeMn(Mo)Co system. ISE Regional Meeting, ISE, Aug 2022, Prague, Czech Republic. ⟨hal-03980570⟩
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