Optical spectroscopic and electrochemical characterization of oxide films on a ferritic stainless steel

Fan, Changfeng; Shi, Jianmin; Sharafeev, Azat; Lemmens, P.; Dilger, Klaus

doi:10.1002/maco.201911425

Cited by 9 publications

(4 citation statements)

References 43 publications

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“…UV-Vis reflectance spectroscopy is sensitive to the electronic structure of compounds and allows us to discriminate between metallic and oxidized species and to distinguish different types of oxides and hydroxides [27,[73][74][75][76]. This approach-which is reported here for the first time in the case of hardmetal corrosion studies-can thus be fruitfully employed to achieve a deeper physico-chemical understanding of the nature of pseudopassive layers.…”

Section: Uv-vis Reflectance Spectroscopymentioning

confidence: 93%

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

Bozzini,

Tavola,

Travella

et al. 2023

Metals

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Recycling of hardmetal scrap is strategic for critical raw materials recovery. Available recycling processes are polluting and have a large carbon footprint. Attempts to exploit controlled corrosion failed in industrial practice, owing to self-limiting processes. We revisit the corrosion route, in view of gaining the fundamental knowledge enabling high-throughput recovery. We selected the worst-case approach of highly corrosion-resistant CoNiWC-based hardmetal grades and neutral aqueous electrolyte at room temperature. Systematic electrochemical measurements, UV–Vis spectroscopy and SEM microscopy disclosed that, even though there is no hope to overcome the self-limiting corrosion rate, nevertheless, by exploiting the mechanical action of anodic O2 evolution acting precisely at the interface between the residual active material and the corrosion film, the latter can be efficiently removed, periodically reactivating the hardmetal corrosion in a way that results in an ultra-high scrap destruction rate, of interest for real-life industrial processes.

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Section: Uv-vis Reflectance Spectroscopymentioning

confidence: 93%

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

Bozzini,

Tavola,

Travella

et al. 2023

Metals

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“…In all double-loop dynamic polarized tests, the potential sweep with scan rate of 1 mV/s was started from −0.2 V to 1 V vs OCP, then reverse scan to OCP. The pitting potential was used to evaluate the pitting corrosion resistance of 304SS, which is defined as the potential when the current density reaches 100 μ A/cm 2 (Fan et al , 2020).…”

Section: Experimental Methodsmentioning

confidence: 99%

Electrochemical corrosion resistance of thermal oxide formed on anodized stainless steel

Deng

Liu²,

et al. 2021

ACMM

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Purpose The purpose of this paper is to investigate and explain thermal oxide effect on electrochemical corrosion resistance anodized stainless steel (SS). Design/methodology/approach Electrochemical corrosion resistance of thermal oxides produced on anodized 304 SS in air at 350°C, 550°C, 750°C and 950°C in 3.5 wt.% NaCl solution have been investigated by dynamic potential polarization, EIS and double-loop dynamic polarization. Anodized 304 SS were obtained by anodization at the constant density of 1.4 mA.cm-2 in the solution containing 28.0 g.L-1H3PO4, 20.0 g.L-1C6H8O7, 200.0 g.L-1H2O2 at 70°C for 50 min. SEM and EDS had been also used to characterize the thermal oxides and passive oxide. Findings Interestingly, anodized 304SS with thermal oxide produced at 350°C displayed more electrochemical corrosion and pitting resistance than anodized 304 SS only with passive oxide, as related to the formation of oxide film with higher chromium to iron ratio. Whereas, anodized 304SS with thermal oxide formed at 950°C shows the worse electrochemical corrosion and pitting resistance among those formed at the high temperatures due to thermal oxide with least compact. Originality/value When thermally oxidized in the range of 350°C–950°C, electrochemical corrosion and pitting corrosion resistance of anodized 304 SS decrease with the increase of temperature due to less compactness, more defects of thermal oxide.

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“…The corrosion resistance of the epoxy coating was experimentally improved using micaceous iron oxide and Al pigments [433]. In the case of stainless steel, iron oxide formation corresponds to a low pitting potential and corrosion resistance and leads to the degraded protective property of the oxide film [434].…”

Section: The Main Applications Of the Structures Containing Iron Oxidesmentioning

confidence: 99%

Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications

Гареев

2023

Magnetochemistry

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Iron oxide compounds have naturally formed during the whole of Earth’s history. Synthetic compositions with iron oxides are produced with the use of various techniques and widely used for scientific and applied purposes. This review considers an attempt to classify all the information on different iron oxide compound formation mechanisms and intended applications in biomedicine, catalysis, waste remediation, geochemistry, etc. All the literature references analyzed were divided into several groups by their number of included iron oxide compounds: compositions containing only one compound (e.g., magnetite or wüstite), including various polymorphs of iron(III) oxide (α-, β-, γ-, ε-, ζ-, δ-Fe2O3); compositions with two different distinguishable iron oxide phases (e.g., maghemite and hematite); compositions containing non-crystalline phases (amorphous iron oxide or atomic clusters); and compositions with mixed iron oxide phases (indistinguishable separate iron oxide phases). Diagrams on the distribution of the literature references between various iron oxide compounds and between various applications were built. Finally, the outlook on the perspectives of further iron oxide studies is provided.

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Optical spectroscopic and electrochemical characterization of oxide films on a ferritic stainless steel

Cited by 9 publications

References 43 publications

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

In-Depth Understanding of Hardmetal Corrosion Performance Reveals a Path to the Electrochemical Demolition of Scrap

Electrochemical corrosion resistance of thermal oxide formed on anodized stainless steel

Diversity of Iron Oxides: Mechanisms of Formation, Physical Properties and Applications

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