Corrosion of thin, magnetron sputtered Nb 2 O 5 films

Pillis, Marina F.; Geribola, Guilherme Altomari; Scheidt, Guilherme; Araújo, Edval Gonçalves de; Oliveira, Mara Cristina Lopes de; Antunes, Renato Altobelli

doi:10.1016/j.corsci.2015.10.023

Cited by 46 publications

(14 citation statements)

References 51 publications

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“…The Nyquist plot, in Figure 8, showed a complete capacitive arc for the substrate and an incomplete arc for the coated steel, similar to the capacitive arcs found in the literature for a niobium pentoxide coating obtained using magnetron sputtering on AISI 316 Stainless Steel (Pillis et al , 2016). The larger radius of the capacitive arc for the coated surface, when extrapolated to regions of lower frequencies, was associated to higher values of impedance, suggesting a delay in the charge transfer reactions and higher corrosion resistance (Pillis et al , 2016; Detlinger et al , 2019). Bode phase angle plots, shown in Figure 9, depicted one time constant for both the substrate and the coated carbon steel, contrarily to the expected two-time constants for the coated sample.…”

Section: Resultssupporting

confidence: 83%

“…The values of potential decreased with time, suggesting the dissolution of the oxide layer formed, followed by the activation of the surface which stabilized the system (Robin, 2004; Sowa et al , 2016). The coated steel stabilized at a higher potential than the substrate, indicating a higher nobility of the coated surface, suggesting a corrosion protection on the coated material (Pillis et al , 2016; Li et al , 2017; Helleis et al , 2021). A lower variation in the coated carbon steel potential was observed, suggesting a higher stability of the formed oxides, indicating a higher resistance to corrosion for the material.…”

Section: Resultsmentioning

confidence: 99%

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Niobium- and titanium-based coating for the protection of carbon steel SAE 1020 against corrosion

Helleis

Maia

Castro

et al. 2022

ACMM

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Purpose The purpose of this paper is to evaluate the protection against corrosion of carbon steel SAE 1020 promoted by a niobium- and titanium-based coating produced from a resin obtained by the Pechini method. Design/methodology/approach A resin was prepared with ammonium niobium oxalate as niobium precursor and K2TiF6 as titanium precursor. Carbon Steel SAE 1020 plates were dip coated in the resin and calcinated for 1 h at 600 ºC. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were used to characterize the coating morphologically and structurally. Open circuit potential, electrochemical impedance spectroscopy, anodic potentiodynamic polarization and scanning vibrating electrode technique were used to evaluate the corrosion protection of the coating. Findings The electrochemical analyses evidence slight protection against corrosion of the coating by itself; however, the needle-like crystal structure obtained may potentially provide a good anchorage site, suggesting the coating could be used as a pretreatment that may present similar application to phosphating processes, generating lower environmental impacts. Originality/value Due to increasingly restrictive environmental laws, new environmentally friendlier surface treatments must be researched. This paper approaches this matter using a combination of niobium- and titanium-based coating, produced by a cleaner process, the Pechini method.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Niobium- and titanium-based coating for the protection of carbon steel SAE 1020 against corrosion

Helleis

Maia

Castro

et al. 2022

ACMM

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“…The R S represents the solution resistance, R CT represents charge transfer resistance at the interface. Moreover, pure capacitors were substituted by constant phase elements (CPE) and the impedance of CPE was defined by equation: ZCPE=[Q(jω)n]−1, where Q is the frequency independent constant; n is the exponential coefficient, the value of which is between 0 and 1; j is an imaginary unit and ω is an angular frequency [33]. The fitted resistance values R CT were listed in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

An Investigation of Surface Corrosion Behavior of Inconel 718 after Robotic Belt Grinding

Wang

Zhang

et al. 2018

Materials

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Surface corrosion resistance of nickel-based superalloys after grinding is an important consideration to ensure the service performance. In this work, robotic belt grinding is adopted because it offers controllable material processing by dynamically controlling process parameters and tool-workpiece contact state. Surface corrosion behavior of Inconel 718 after robotic belt grinding was investigated by electrochemical testing in 3.5 wt % NaCl solution at room temperature. Specimens were characterized by morphology, surface roughness and residual stress systematically. The potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) analysis indicate the corrosion resistance of the specimen surface improves remarkably with the decrease of abrasive particle size. It can be attributed to the change of surface roughness and residual stress. The energy dispersive X-ray spectroscopy (EDS) indicates that niobium (Nb) is preferentially attacked in the corrosion process. A plausible electrochemical dissolution behavior for Inconel 718 processed by robotic belt grinding is proposed. This study is of significance for achieving desired corrosion property of work surface by optimizing grinding process parameters.

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“…The passive current density was used as a measure of the anodic dissolution rate for the uncoated and PPy-0.1M conditions and was determined at the middle of the passive region. [24,25] It is important to point out that the anodic and cathodic reactions for the PPy-coated samples may be related to the doping and dedoping of PPy, which might include the salycilate anion exchange by chloride anion during the dedoping and doping processes. The value of corrosion current density (i corr ) was determined only for the PPy-0.5M condition, because its polarization curve did not present a passive region, allowing the Tafel extrapolation method to be accurately employed.…”

Section: Potentiodynamic Polarizationmentioning

confidence: 99%

Exploring the relationship between the surface chemistry and the corrosion behavior of electropolymerized polypyrrole films deposited on the surgical ISO 5832‐1 stainless steel

Nascimento

Santos

Venâncio

et al. 2020

Surface & Interface Analysis

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In the present work, electropolymerized polypyrrole (PPy) films were obtained on the surface of the surgical ISO 5832‐1 stainless steel. The films were obtained from solutions containing 0.1M and 0.5M of the monomer by cyclic voltammetry deposition. The correlation between the surface chemistry of the as‐deposited films and the corrosion behavior of the coated substrate is explored. X‐ray photoelectron spectroscopy was used to study the chemical state of the main elements in the PPy films. Electrochemical impedance spectroscopy and potentiodynamic polarization tests were employed to evaluate the corrosion resistance of the PPy‐coated samples. The tests were conducted in phosphate‐buffered saline solution at 37°C. The measured corrosion current densities were dependent on the doping level of the PPy film and decreased with the reduction of the doping level of the PPy layer.

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Corrosion of thin, magnetron sputtered Nb 2 O 5 films

Cited by 46 publications

References 51 publications

Niobium- and titanium-based coating for the protection of carbon steel SAE 1020 against corrosion

Niobium- and titanium-based coating for the protection of carbon steel SAE 1020 against corrosion

An Investigation of Surface Corrosion Behavior of Inconel 718 after Robotic Belt Grinding

Exploring the relationship between the surface chemistry and the corrosion behavior of electropolymerized polypyrrole films deposited on the surgical ISO 5832‐1 stainless steel

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