Corrosion mechanisms in model binary metallic glass coatings on mild steel and correlation with electron work function

Mahajan, Chaitanya; Hasannaeimi, Vahid; Pole, Mayur; Kautz, Elizabeth J.; Gwalani, Bharat; Mukherjee, Sundeep

doi:10.1016/j.corsci.2022.110578

Cited by 15 publications

(7 citation statements)

References 65 publications

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“…V SKP is the potential applied by the instrument to nullify the contact potential difference ( V CPD ) between the tungsten probe and the sample. Thus, the V SKP is a measure of the work function with respect to the tungsten probe ( V SKP = ϕ Tungsten – ϕ Sample ) . Considering a constant work function of the tungsten probe, the difference in potential values was attributed to their relative EWF (relative SKP potential).…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the V SKP is a measure of the work function with respect to the tungsten probe (V SKP = ϕ Tungsten − ϕ Sample ). 54 Considering a constant work function of the tungsten probe, the difference in potential values was attributed to their relative EWF (relative SKP potential). An inverse correlation between the relative SKP potential and HOR activity (SECM tip current) of the Pt 42.5−x Pd x BMGs is shown in Figure 4c,d 55,56 Usually, a positive shift in the core level B.E.…”

Section: Secm and Skp Measurements For Correlating With Ewfmentioning

confidence: 99%

“…Thus, the V SKP is a measure of the work function with respect to the tungsten probe (V SKP = ϕ Tungsten − ϕ Sample ). 54 55,56 Usually, a positive shift in the core level B.E. is related to loss of electrons.…”

Section: Secm and Skp Measurements For Correlating With Ewfmentioning

confidence: 99%

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Model Metallic Glasses for Superior Electrocatalytic Performance in a Hydrogen Oxidation Reaction

Mahajan

Hasannaeimi

Neuber

et al. 2023

ACS Appl. Mater. Interfaces

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Metallic glasses or amorphous alloys, with their excellent chemical stability, disordered atomic arrangement, and ability for thermoplastic nanostructuring, show promising performance toward a range of electrocatalytic reactions in proton-exchange membrane fuel cells. However, there are knowledge gaps and a distinct lack of understanding of the role of amorphous alloy chemistry in determining their catalytic activity. Here, we demonstrate the influence of alloy chemistry and the associated electronic structure on the hydrogen oxidation reaction (HOR) activity of a systematic series of Pt42.5–x Pd x Cu27Ni9.5P21 bulk metallic glasses (BMGs) with x = 0 to 42.5 at%. The HOR activity and electrochemical active surface area as a function of composition were in the form of volcano plots, with a peak around equal proportion of Pt and Pd. The lower relative electron work function and higher binding energy of the Pt core level explain the reduced charge-transfer resistance and improved electrocatalytic activity due to weakened chemisorption of protons in the mid-range composition. Density functional theory calculations show the lower free energy change and higher hydrogen adsorption density for these Pt42.5–x Pd x Cu27Ni9.5P21 BMGs, suggesting a synergistic effect from the presence of both noble metals, Pt and Pd.

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Section: Resultsmentioning

confidence: 99%

Section: Secm and Skp Measurements For Correlating With Ewfmentioning

confidence: 99%

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Model Metallic Glasses for Superior Electrocatalytic Performance in a Hydrogen Oxidation Reaction

Mahajan

Hasannaeimi

Neuber

et al. 2023

ACS Appl. Mater. Interfaces

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“…From Figure 2.2 XRD analysis of pure cobalt reveals a crystalline hexagonal closepacked (HCP) crystal structure with prominent peaks corresponding to the (100), (002), (101), and (110) planes. However, upon the addition of P to the Co matrix, a new peak emerges at the (111) plane, indicating the presence of a nanocrystalline structure [41]. In contrast, the P-rich samples with phosphorus content exceeding 10 at.…”

Section: 3mentioning

confidence: 98%

“…Since in electrodeposition the metals have a rapid cooling rate, it restricts the time the atoms have to arrange themselves in a crystalline lattice. In addition to that, high P-content hindered crystal nucleation and surface diffusion caused by the higher phosphorus content that prevents the Co atoms from attaining the thermodynamically stable crystalline structure [41]. Figure 3.3b-c…”

Section: Compositional and Structural Characterizationmentioning

confidence: 99%

Tribocatalytically-Active Coatings for Enhanced Tribological Performance and Carbon-Based Tribofilm Formation

Al Sulaimi

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In this study, we investigate the fundamental mechanisms defining the approach for addressing tribological challenges in mechanical systems via the use of the tribocatalytically active coating. The coating is designed using an electrodeposition process and consists of a hard amorphous cobalt-phosphorous matrix with the incorporation of tribocatalytically-active nickel and copper. Our focus is on understanding the effect of the tribocatalytic elements, Cu vs Ni, on the coating's performance in high-contact stress conditions, generating local heating, shear, and compression. By optimizing the relative composition and mechanical characteristics of the coating, we aim to enhance its tribological performance in the presence of a hydrocarbon environment. Through extensive characterization of the wear tracks using SEM/EDS and Raman analyses, we identify the formation of a protective carbon-based tribofilm on the coating's surface during sliding as the key factor behind its excellent performance. Our findings not only contribute to the understanding of material transformations in the contact but also offer a robust and versatile approach to addressing tribological challenges in mechanical systems. The development of this innovative coating opens up new possibilities for promoting the formation of protective tribofilms and improving the performance of mechanical components operating in low-viscosity fuels and synthetic oils.

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Effect of structural heterogeneity on stable pit growth of Co-based metallic glasses

Ma,

Mu,

Yang

et al. 2024

Corrosion Science

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Corrosion mechanisms in model binary metallic glass coatings on mild steel and correlation with electron work function

Cited by 15 publications

References 65 publications

Model Metallic Glasses for Superior Electrocatalytic Performance in a Hydrogen Oxidation Reaction

Model Metallic Glasses for Superior Electrocatalytic Performance in a Hydrogen Oxidation Reaction

Tribocatalytically-Active Coatings for Enhanced Tribological Performance and Carbon-Based Tribofilm Formation

Effect of structural heterogeneity on stable pit growth of Co-based metallic glasses

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