Effect of time on the characteristics of passive film formed on stainless steel

Jiang, Ruijing; Wang, Yuwu; Wen, Xu; Chen, Changfeng; Zhao, Jingmao

doi:10.1016/j.apsusc.2017.03.155

Cited by 91 publications

(23 citation statements)

References 40 publications

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“…As the main constituent of the stainless steel matrix, iron is the major species in the passive film for all samples. The chromium fraction increased from 0 to 60 s, indicating it is enriched in the inner layer of the passive film, as reported by other authors 35 . Nickel and molybdenum concentrations slightly increase as the passive film is gradually removed.…”

Section: Resultssupporting

confidence: 86%

Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel

Costa

Oliveira

Antunes

2020

Surface & Interface Analysis

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Citric acid passivation is an attractive alternative to increase the corrosion resistance of stainless steels. In this work, the correlation of passive film composition and the corrosion properties of citric acid-passivated AISI 316L stainless steel samples was assessed. The concentration of citric acid in the passivating solution was varied from 10 to 30 wt.%. Passive film composition was examined by X-ray photoelectron spectroscopy. The corrosion behavior was investigated by potentiodynamic polarization curves. The citric acid passivation treatment led to Cr 2 O 3 enrichment of the passive film, especially for the 20-wt.% concentration. By increasing the citric acid concentration to 30 wt.%, the corrosion resistance decreased. In addition to chromium compounds, the passivation treatment also affected the relative concentrations of Fe, Mo, and Ni compounds in the passive films. The formation of Mo oxides was triggered at citric acid concentrations of 10 and 20 wt.%, contributing to slower anodic dissolution rate. The corrosion resistance of the passivated samples was favored as the relative concentration of Fe oxides (FeO and Fe 2 O 3) increased with respect to FeOOH.

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Section: Resultssupporting

confidence: 86%

Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel

Costa

Oliveira

Antunes

2020

Surface & Interface Analysis

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“…Many applications require steels that provide a high degree of corrosion resistance in harsh environments. For stainless steel (SS), this is facilitated by a rather thin, oxidized, passive surface region of just a couple of nanometer thickness . Its specific properties protect the surface of the alloy from corrosion attack .…”

Section: Introductionmentioning

confidence: 99%

Swelling of Steel Film by Hydrogen Absorption at Cathodic Potential in Electrolyte

Garai

Carlomagno

Solokha

et al. 2020

Physica Status Solidi (b)

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An ≈4 nm FeCrNi film, deposited on a Ru/B4C multilayer (ML), is used to study cathodic hydrogen charging in electrolyte. A thin film on a ML allows obtaining precise quantitative information on surface metal composition and oxidation state using the X‐ray standing wave technique combined with near‐edge X‐ray absorption spectroscopy. The metal composition is found being close to the composition of stainless steel (SS) 304, and, as for bulk steel, the outer 2 nm passive layer, consisting of oxidized iron and chromium, is depleted of nickel. Overall, it is found that the film represented a useful replica of the surface of bulk steel. Following exposure to 0.1 m KCl electrolyte at −0.6 V versus Ag/AgCl, 11.3 (±3)% swelling of the film by hydrogen absorption is observed. The estimated absorbed amount is exceeding reported bulk absorption under similar conditions by more than an order of magnitude. Strong hydrogen absorption appears to be enabled by the 2D character of the thin film, i.e., a significantly lower associated strain energy compared with bulk absorption. The strong surface swelling is suggested to be related to the lowering of the pitting corrosion resistance of SS surfaces reported following hydrogen exposure.

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“…[24][25][26] Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) have been used, both ex situ and in situ, to investigate the atomic structure, roughness, and topography of the outermost surface layers of various metals. 13,14,[27][28][29][30] Recently, efforts have been made to investigate the effects of aging 31 and heating at elevated temperatures on the passive film. 32,33 Transpassive breakdown at high electrochemical potentials has also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses

et al. 2019

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Passivity determines corrosion resistance and stability of highly-alloyed stainless steels, and passivity breakdown is commonly believed to occur at a fixed potential due to formation and dissolution of Cr(VI) species. In this work, the study of a 25Cr-7Ni super duplex stainless steel in 1 M NaCl solution revealed that the passivity breakdown is a continuous degradation progress of the passive film over a potential range, associated with enhanced Fe dissolution before rapid Cr dissolution and removal of the oxide. The breakdown involves structural and compositional changes of the passive film and the underlying alloy surface layer, as well as selective metal dissolution depending on the anodic potential. The onset of passivity breakdown occurred at 1000 mV/ Ag/AgCl , and Fe dissolved more on the ferrite than the austenite phase. With increasing potential, the passive film became thicker but less dense, while the underlying alloy surface layer became denser indicating Ni and Mo enrichment. Rapid Cr dissolution occurred at ≥1300 mV/ Ag/AgCl .

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Effect of time on the characteristics of passive film formed on stainless steel

Cited by 91 publications

References 40 publications

Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel

Interplay between the composition of the passive film and the corrosion resistance of citric acid‐passivated AISI 316L stainless steel

Swelling of Steel Film by Hydrogen Absorption at Cathodic Potential in Electrolyte

Redefining passivity breakdown of super duplex stainless steel by electrochemical operando synchrotron near surface X-ray analyses

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