The effect of Cu addition on the electrochemical corrosion and passivation behavior of stainless steels

Oguzie, Emeka E.; Li, Jibiao; Liu, Yongqian; Chen, Demin; Liu, Ying; Yang, Ke; Wang, Fuhui

doi:10.1016/j.electacta.2010.04.015

Cited by 154 publications

(60 citation statements)

References 30 publications

(60 reference statements)

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“…These positions are governed mainly by the charge transfer across the semiconductor/electrolyte interface, the contact potential between semiconductor and electrolyte, and the stability of the semiconductor. According to the energy-band model [74], for a sample covered with an n-type semiconducting passive film, it behaves as a conductor at potentials more negative than the passive film's flat band potential, as the passive film enters an accumulation mode. In contrast, at potentials more positive than E fb , the band bending creates a barrier (space charge layer) to electron transfer, and the sample shows a dielectric characteristic.…”

Section: Influence Of Nb Addition On the Electronic Properties Of Pasmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

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nanocrystalline coatings were deposited onto Ti-6Al-4V substrates by a double glow discharge plasma technique. The effects of Nb alloying on the electrochemical behavior of the Ti 5 Si 3 nanocrystalline coatings were systematically investigated in a naturally aerated 5 wt.% H 2 SO 4 solution, for which various electrochemical techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostatic polarization and Mott-Schottky analysis, were employed. Moreover, to evaluate the corrosion performance of the as-deposited coatings over an extended period, their corrosion resistance was analyzed after 7 days' immersion in a 5 wt.% H 2 SO 4 solution by EIS measurements and observations of corroded surface morphologies. The results showed that the Ti 62.5Àx Nb x Si 37.5 (x = 0, 6.3, 12.5) nanocrystalline coatings exhibit superior corrosion resistance compared with Ti-6Al-4V, and their corrosion resistance is enhanced with increasing Nb content, suggesting that Nb alloying is an effective strategy for improving the corrosion protection ability of the Ti 5 Si 3 nanocrystalline coating. The roles of Nb additions in enhancing the corrosion resistance of the Ti 5 Si 3 nanocrystalline coatings can be summarized as: (a) reducing the residual tensile stresses of the as-deposited coatings and (b) tailoring the composition, compactness and electronic structure of the passive films formed. These findings are expected to broaden the application of Ti 5 Si 3 as a highly corrosion-resistant coating for engineering components operating under aggressive conditions.

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Section: Influence Of Nb Addition On the Electronic Properties Of Pasmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

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“…Postrach et al 15) claimed that the films of alloys containing Cu, according to the accelerated open circuit breakdown of Cu bearing samples, are less stable than expected, which is related to a faster removal of the oxide film. Oguzie et al 16) reported that Cu has negative effects on the stability of the passive film of austenitic, ferritic and martensitic stainless steels in the sulfuric acid solution due to the presence of Cu in the passive film as cupric ions increased the donor (N D ) and acceptor (N A ) densities affecting the film stability. These inconsistent results on the passivity of stainless steels revealed a very complex role played by Cu.…”

Section: Introductionmentioning

confidence: 99%

Effects of Copper Addition on the Passivity and Corrosion Behavior of 27Cr-7Ni Hyper Duplex Stainless Steels in Sulfuric Acid Solution

et al. 2015

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The effect of the Cu addition on the passivation behavior of hyper duplex stainless steels in both the active and passive states was investigated using the electrochemical tests, a scanning electron microscope-energy dispersive spectroscope, a scanning Auger multi-probe analysis and an X-ray photoelectron spectroscopy analysis in sulfuric acid solution. In the active region of ¹0.2 V SCE , the Cu addition to the base alloy has a positive effect on the general corrosion resistance due to the novel Cu enriched on the surface. In the passive region of 0.6 V SCE , the Cu addition to the base alloy degraded the stability of passive film due to an increase of the formation of Cr enriched inclusion such as (Cr, Mn, Al) oxides and (Cr, Mn, Al, Fe) oxides acting as the defect in the passive film, resulting in deteriorating general corrosion resistance.

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“…Cu alloying in combination with appropriate heat treatment is used to produce a special class of antibacterial steels that have antimicrobial activity due to ε-Cu precipitation of on the steel surface. 24) The uniform dispersion of the ε-Cu nanoparticles provides stronger interactions and obstacles to the dislocation motion, thus resulting in an increase in the strength of the steel. The elongation and impact toughness of the steel did not experience an apparent decrease due to the particle size remaining extremely small (~30 nm).…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Corrosion Resistance of Cu-modified 3Cr Low-alloy Steel in 3.5%NaCl Solution

Zhang

Liu

et al. 2017

ISIJ Int.

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The effect of Cu addition on the corrosion behavior of 3Cr steel in 3.5 wt.% NaCl solution was investigated by immersion tests and electrochemical measurements. Cu was selected to partially replace Cr in Cu-modified 3Cr steel. Cu addition can improve corrosion resistance of 3Cr steel at the initial stage, and then the phenomenon gradually weakens with increasing immersion time. The reduced corrosion resistance of 3Cr steel caused by Cr decrease suitably offset by the presence of Cu, resulting a reduced-cost Cu-modified 3Cr steel without sacrificing ether its mechanical properties or corrosion resistance.

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The effect of Cu addition on the electrochemical corrosion and passivation behavior of stainless steels

Cited by 154 publications

References 30 publications

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Effects of Copper Addition on the Passivity and Corrosion Behavior of 27Cr-7Ni Hyper Duplex Stainless Steels in Sulfuric Acid Solution

Corrosion Resistance of Cu-modified 3Cr Low-alloy Steel in 3.5%NaCl Solution

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