Effect of pH on Electrochemical Behaviour and Passive Film Composition of Stainless Steels

Elsner, B.; Rossi, Antonella

doi:10.4028/www.scientific.net/msf.192-194.225

Cited by 29 publications

(29 citation statements)

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“…Secondary ion mass spectroscopy (SIMS) and depth profiling by Auger electron spectroscopy and XPS could provide an accurate estimate of the overlayer thickness, but these methods are destructive. Alternately, the overlayer thickness can be determined non-destructively by XPS 53,54,[59][60][61][62][63][64][65] . Since most NEXAFS endstations at modern synchrotron facilities include XPS spectrometers, the calculation of the overlayer thickness can be performed by acquiring XPS spectra in the same experimental chamber, thus avoiding any risk of changing the composition and thickness of the contamination layer upon transferring the sample to a dedicated XPS chamber.…”

Section: Resultsmentioning

confidence: 99%

“…With X-ray photoelectron spectroscopy (XPS), the composition and thickness of each layer constituting a multilayer system can be determined without applying any destructive technique 53,54,[59][60][61][62][63][64][65] . However, no methodology for extracting the photo-absorption spectrum of a single layer within a multilayer structure has ever been reported for NEXAFS spectroscopy in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Accounting for Nanometer-Thick Adventitious Carbon Contamination in X-ray Absorption Spectra of Carbon-Based Materials

et al. 2014

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Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy is a powerful technique for characterizing the composition and bonding state of nanoscale materials and the top few nanometers of bulk and thin film specimens. When coupled with imaging methods like photoemission electron microscopy, it enables chemical imaging of materials with nanometerscale lateral spatial resolution. However, analysis of NEXAFS spectra is often performed under the assumption of structural and compositional homogeneity within the nanometer-scale depth probed by this technique. This assumption can introduce large errors when analyzing the vast majority of solid surfaces due to the presence of complex surface and near-surface structures such as oxides and contamination layers. An analytical methodology is presented for removing the contribution of these nanoscale overlayers from NEXAFS spectra of two-layered systems to provide a corrected photo-absorption spectrum of the substrate. This method relies on the subtraction of the NEXAFS spectrum of the overlayer adsorbed on a reference surface from the spectrum of the two-layer system under investigation, where the thickness of the overlayer is independently determined by X-ray photoelectron spectroscopy (XPS). This approach is applied to NEXAFS data acquired for one of the most challenging cases: air-exposed hard carbon-based materials with adventitious carbon contamination from ambient exposure. The contribution of the adventitious carbon was removed from the as-acquired spectra of ultrananocrystalline diamond (UNCD) and hydrogenated amorphous carbon (a-C:H) to determine the intrinsic photoabsorption NEXAFS spectra of these materials. The method alters the calculated fraction of sp 2 -hybridized carbon from 5 to 20%, and reveals that the adventitious contamination can be

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accounting for Nanometer-Thick Adventitious Carbon Contamination in X-ray Absorption Spectra of Carbon-Based Materials

et al. 2014

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“…The passivation of SS is a complex process influenced by several parameters, such as the alloy composition, the environment, and the conditions of passive layer formation [1][2][3][4][5][6]. The electrochemical properties of passive SS have been widely studied from passive layers grown under controlled conditions (potentiostatic or potentiodynamic tests) [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical response of natural and induced passivation of high strength duplex stainless steels in alkaline media

Sánchez¹,

Mahmoud²,

Alonso³

2011

J Solid State Electrochem

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The passivation of two high strength duplex stainless steels (HSSS) was investigated in alkaline solutions simulating the pore solution of concrete by the growth of natural and induced passive films. Induced passive films were generated both by cyclic voltammetry and by chronoamperometry. Natural passive films were spontaneously grown by the immersion of the steel in the alkaline electrolyte. These passive layers were characterised by electrochemical impedance spectroscopy, corrosion current density (i corr ) and corrosion potential (E corr ) monitoring. The effect of significant parameters, such as the pH in the HSSS/alkaline solution interface, the composition of the duplex stainless steels and the ageing of the passive layer, on the electrochemical performance of both induced and spontaneously grown passive films has been analysed. The increase of alkalinity highly influences the electrochemical performance of the passive film by promoting the formation of a passive layer with a less resistant electrochemical response. The electrochemical behaviour of the passive layer is also affected by the alloying elements like Mo or Ni. Both natural and induced passive films show similar electrochemical trend with respect to significant parameters such as the pH and the composition of the steel. The ageing of the spontaneously grown passive layer promotes a higher resistive electrochemical response which might be related to the enrichment of the passive layer in nonconducting (or semi-conducting) oxides.

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“…The SS surface has a passive film consisting mainly of oxides and hydroxides of chromium and iron. 24,25) Upon contact with an aqueous solution, the hydroxyl groups (M-OH) can be positively charged by protonation (M-OH 2 þ ) at low pH values and negatively charged by deprotonation (M-O À ) at high pH values. 26) The apparent point of zero charge has been reported to be at pH 8.5 for SS of type 316L.…”

Section: Adsorption Behavior In Different Types Of Buffer Solutionmentioning

confidence: 99%

Effects of Ionic Substances on the Adsorption of Egg White Proteins to a Stainless Steel Surface

Sugiyama

Hagiwara

Watanabe

et al. 2012

Bioscience, Biotechnology, and Biochemistry

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Effect of pH on Electrochemical Behaviour and Passive Film Composition of Stainless Steels

Cited by 29 publications

References 0 publications

Accounting for Nanometer-Thick Adventitious Carbon Contamination in X-ray Absorption Spectra of Carbon-Based Materials

Accounting for Nanometer-Thick Adventitious Carbon Contamination in X-ray Absorption Spectra of Carbon-Based Materials

Electrochemical response of natural and induced passivation of high strength duplex stainless steels in alkaline media

Effects of Ionic Substances on the Adsorption of Egg White Proteins to a Stainless Steel Surface

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