Polarization Behavior of Active Passive Metals and Alloys

Scully, John R.; Lutton, Katie

doi:10.1016/b978-0-12-409547-2.13393-1

Cited by 6 publications

(7 citation statements)

References 30 publications

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“…In order to evaluate the contribution of a specific element, M, toward passivation rather than direct cation ejection or film dissolution, the expected, element-specific dissolution current density based on congruent alloy dissolution where E app is well above the Nernst E r and E pp 113 for each element was computed and the oxidation contribution was similarly obtained using i M ICP :…”

Section: Discussionmentioning

confidence: 99%

In Operando Analysis of Passive Film Growth on Ni-Cr and Ni-Cr-Mo Alloys in Chloride Solutions

Cwalina

Ott

et al. 2019

J. Electrochem. Soc.

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The instantaneous kinetics of oxide formation and growth, in competition with passive film dissolution and breakdown, were investigated for Ni-22 Cr and Ni-22 Cr-6 Mo (wt%) during single step passivation at +0.2 V SCE . Experiments were conducted in selected acidic and alkaline chloride-containing environments using simultaneous AC and DC electrochemistry; including on-line Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). In parallel experiments, in-situ neutron reflectometry (NR) and ex-situ X-ray photoelectron spectroscopy (XPS) were utilized to characterize the formation of surface oxide films as a function of time. The specific roles of pH and Mo during passivation and breakdown kinetics are highlighted, providing an insight into the fate of the elements which comprise the alloys, and their effects on passivation behavior. It was observed that early oxidation of both Ni and Cr-species occurred in acidic electrolyte. Preferential dissolution of Ni 2+ at later times enabled gradual Cr 3+ enrichment within the surface film. However, greater relative stability of NiO and Ni(OH) 2 was observed in the alkaline condition. Upon alloying Ni-Cr with Mo, Cr 3+ became increasingly enriched in the surface film during anodic polarization. Oxides were interpreted to consist of non-stoichiometric solid solutions formed via solute capture.

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Section: Discussionmentioning

confidence: 99%

In Operando Analysis of Passive Film Growth on Ni-Cr and Ni-Cr-Mo Alloys in Chloride Solutions

Cwalina

Ott

et al. 2019

J. Electrochem. Soc.

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“…SS is known to show an active-to-passive behavior, where various environmental factors (e.g., pH, oxide film thickness, etc.) can influence the magnitude of the current change between the two regions. , The active region is attributed to the oxidation and subsequent dissolution of Fe. Dissolved Fe accumulates past its solubility limit in the solution next to the metal surface, which results in its precipitation and the metal’s repassivation .…”

Section: Resultsmentioning

confidence: 99%

Selective Initiation of Corrosion Pits in Stainless Steel Using Scanning Electrochemical Cell Microscopy

Grandy,

Yassine,

Lacasse

et al. 2024

Anal. Chem.

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Scanning electrochemical cell microscopy is a useful technique for determining variations in corrosion behavior across a surface. However, the numerous options for experimental parameters and little understanding of their effect on the corroding system render comparisons of results between studies difficult. Herein, we explore changes in corrosion behavior of two martensitic stainless steels, a cast CA6NM and a wrought S41500, as a result of the chosen experimental parameters, including scan rate, approach potential, surface oil immersion, and tip aperture diameter. The study demonstrates that these experimental parameters can be controlled to probe oxide passivation kinetics and single pitting events by changing the surface state and cathodic currents. We measured the pitting and repassivation kinetics of a single pit and determined the compositional change of the Al 2 O 3 inclusion site initiation point. Hundreds of data points were measured within 17 h of experimental time on the stainless steel samples, allowing statistical averages of corrosion and pitting values. This work will open new avenues for fine-tuning various corrosion aspects at the microscale, thereby contributing to a deeper understanding of the corrosion processes and mechanisms of diverse materials.

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“…A minimal difference in results can be observed with similar corrosion potentials (E corr ), critical potential (E crit ), critical (i crit ), and passive (i pass ) current densities independent of the cell types. 38 Figure 3b shows a Bode plot of the EIS at OCP for all the tests on the thin film and bulk alloys after exposing their native oxides to 0.1 mol l −1 H 2 SO 4(aq) for 15 min. Here, the impedance is mainly capacitive in the case of 316 L, 304 L, #13, and #14.…”

Section: Resultsmentioning

confidence: 99%

A High Throughput Aqueous Passivation Testing Methodology for Compositionally Complex Alloys Using a Scanning Droplet Cell

Sur,

Joress,

Hattrick-Simpers

et al. 2023

J. Electrochem. Soc.

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Compositionally complex alloys containing five or more principal elements provide an opportunity to explore a wide range of compositions, processing, and microstructural variables to find new materials with unique properties. In particular, the discovery of novel alloys that form self-healing protective passivating films is of substantial interest. Probing experimentally a robust landscape of such alloys requires the utilization of high-throughput electrochemical methods to uncover key differences, ideally captured by discriminating metrics, indicative of superior properties. Herein, a methodology is demonstrated using a scanning droplet cell for a rapid passivation behavior evaluation of Al0.7-x-yCoxCryFe0.15Ni0.15 combinatorial alloy library in 0.1 mol/L H2SO4(aq).

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Polarization Behavior of Active Passive Metals and Alloys

Cited by 6 publications

References 30 publications

In Operando Analysis of Passive Film Growth on Ni-Cr and Ni-Cr-Mo Alloys in Chloride Solutions

In Operando Analysis of Passive Film Growth on Ni-Cr and Ni-Cr-Mo Alloys in Chloride Solutions

Selective Initiation of Corrosion Pits in Stainless Steel Using Scanning Electrochemical Cell Microscopy

A High Throughput Aqueous Passivation Testing Methodology for Compositionally Complex Alloys Using a Scanning Droplet Cell

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