Corrosion behavior of 904L austenitic stainless steel in hydrofluoric acid

Zou, Guobo; Shi, Wei; Xiang, Song; Ji, Xiaoxiao; Ma, Guoqiang; Ballinger, R. G.

doi:10.1039/c7ra12453h

Cited by 39 publications

(16 citation statements)

References 17 publications

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“…Figure shows the Nyquist and Bode plots of the S31254 steel after hot‐rolling and solution treatment in the 10 wt% NaCl solution. The Nyquist plots of the samples exhibited a depressed semicircle with a capacitive arc (Figure a), where the diameter of the semicircle of Nyquist plots indicates corrosion resistance . Also, the diameter of the capacitive semicircle increased as the solution treatment time was extended, indicating that the passive film stability of the S31254 samples was better after solution treatment at 4 h. Figure b shows that as compared with hot‐rolled sample, the samples after solution treatment in the middle frequency region wider, and the sample after 4 h of solution treatment had a higher phase degree, suggesting that sample had a condense and intact passivation film.…”

Section: Resultsmentioning

confidence: 96%

Effect of Solution Treatment on the Microstructure and Performance of S31254 Super Austenitic Stainless Steel

Cui

Qurashi

Wang

et al. 2019

steel research int.

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The second phases in the S31254 super austenitic stainless steel is easily precipitated, and the solution treatment plays an important role on the microstructure and performance. In this work, the solution treatment is performed on S31254 steel at 1180, 1200, and 1220 C for 1, 2, and 4 h, respectively. Given the grain size and precipitation of second phase, the 1200 C for 4 h or 1220 C for 2 h may be suitable as the solid-solution parameters. The corrosion resistance and impact toughness of the steel after solution treatment at 1200 C are further investigated by means of microstructural analysis and electrochemical experiments. The sample after solution treatment for 4 h, where no second phase can be observed, exhibits a lower corrosion rate and a better mechanical properties, compared to that after annealed for 1 or 2 h. The electrochemical impedance spectroscopy, Mott-Schottky, and XPS results indicate that the passive films of the samples, with a significantly decreased donor and acceptor densities and increased Cr 2 O 3 and Mo-riched oxides, may be responsible for the improvement of corrosion resistance. The impact toughness results show that the samples after solution treatment for 4 h has the highest impact energy among the studied samples.

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Section: Resultsmentioning

confidence: 96%

Effect of Solution Treatment on the Microstructure and Performance of S31254 Super Austenitic Stainless Steel

Cui

Qurashi

Wang

et al. 2019

steel research int.

View full text Add to dashboard Cite

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“…When in contact with oxides, HF dissolves them. Thereafter, fluorides ions react with the substrate alloying elements, like Fe and Mn, until the anionic species F − has totally reacted; then, reactions with the oxygen ions in the solution begins [ 105 ]. However, this explanation for the mechanism of reaction between HF and the substrate is not universally accepted.…”

Section: Discussionmentioning

confidence: 99%

Surface processing for iron-based degradable alloys: A preliminary study on the importance of acid pickling

Andrade

Paternoster

Chevallier

et al. 2022

Bioactive Materials

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The formation of a heterogeneous oxidized layer, also called scale, on metallic surfaces is widely recognized as a rapid manufacturing event for metals and their alloys. Partial or total removal of the scale represents a mandatory integrated step for the industrial fabrication processes of medical devices. For biodegradable metals, acid pickling has already been reported as a preliminary surface preparation given further processes, such as electropolishing. Unfortunately, biodegradable medical prototypes presented discrepancies concerning acid pickling studies based on samples with less complex geometry (e.g., non-uniform scale removal and rougher surface). Indeed, this translational knowledge lacks a detailed investigation on this process, deep characterization of treated surfaces properties, as well as a comprehensive discussion of the involved mechanisms. In this study, the effects of different acidic media (HCl, HNO 3 , H 3 PO 4 , CH 3 COOH, H 2 SO 4 and HF), maintained at different temperatures (21 and 60 °C) for various exposition time (15–240 s), on the chemical composition and surface properties of a Fe–13Mn-1.2C biodegradable alloy were investigated. Changes in mass loss, morphology and wettability evidenced the combined effect of temperature and time for all conditions. Pickling in HCl and HF solutions favor mass loss (0.03–0.1 g/cm 2 ) and effectively remove the initial scale.

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“…Wet-chemical etching of FIB lift-outs with HF acid has been shown to produce high-quality Si/SiGe nano-pillars with clean oxide free surfaces. 50 However, the use of HF acid is known to preferentially react with Ni to form an insoluble NiF 2 layer 51 and, hence, would degrade the structure and magnetic properties of the NiFe section.…”

Section: Discussionmentioning

confidence: 99%

Off-axis electron holography for the direct visualization of perpendicular shape anisotropy in nanoscale 3D magnetic random-access-memory devices

et al. 2022

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Perpendicular shape anisotropy (PSA) and double magnetic tunnel junctions (DMTJs) offer practical solutions to downscale spin-transfer-torque Magnetic Random-Access Memory (STT-MRAM) beyond 20 nm technology nodes, while retaining their thermal stability and reducing critical currents applied. However, as these modern devices become smaller and three-dimensionally (3D) complex, our understanding of their functional magnetic behavior is often indirect, relying on magnetoresistance measurements and micromagnetic modeling. In this paper, we review recent work that was performed on these structures using a range of advanced electron microscopy techniques, focusing on aspects specific to the 3D and nanoscale nature of such elements. We present the methodology for the systematic transfer of individual SST-MRAM nano-pillars from large-scale arrays to image their magnetic configurations directly using off-axis electron holography. We show that improved phase sensitivity through stacking of electron holograms can be used to image subtle variations in DMTJs and the thermal stability of <20 nm PSA-STT-MRAM nano-pillars during in situ heating. The experimental practicalities, benefits, and limits of using electron holography for the analysis of MRAM devices are discussed, unlocking practical pathways for direct imaging of the functional magnetic performance of these systems with high spatial resolution and sensitivity.

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Corrosion behavior of 904L austenitic stainless steel in hydrofluoric acid

Abstract: An insoluble layer is deposited on 904L in HF due to a preferential reaction between [F−] and the [Ni] from the alloy. This insoluble deposit layer helps isolate the aggressive ions from the base metal, while inhibits the passivation of 904L in HF.

Cited by 39 publications

References 17 publications

Effect of Solution Treatment on the Microstructure and Performance of S31254 Super Austenitic Stainless Steel

Effect of Solution Treatment on the Microstructure and Performance of S31254 Super Austenitic Stainless Steel

Surface processing for iron-based degradable alloys: A preliminary study on the importance of acid pickling

Off-axis electron holography for the direct visualization of perpendicular shape anisotropy in nanoscale 3D magnetic random-access-memory devices

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