The transpassive dissolution mechanism of highly alloyed stainless steels

Betova, Iva; Bojinov, Martin; Laitinen, Timo; Mäkelä, Kari; Pohjanne, Pekka; Saario, Timo

doi:10.1016/s0010-938x(02)00074-4

Cited by 59 publications

(56 citation statements)

References 18 publications

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“…It was observed that all the alloys generally exhibited lower corrosion rates in chloride solution compared to sulfuric acid solution. Similar observation was made by Ameer et al [26] and Betova et al [27] in their report, it was seen that the corrosion rate of the alloy tested was higher in the sulfate containing solution than The behavior of the alloys in 3.5% NaCl solution was further studied using polarization Fe 40 Co 10 region, but other alloys generally did not show any noticeable spontaneously and directly go into a Fe, a decrease in anodic and cathodic current densities was observed. This decrease indicates anodic dic hydrogen evolution reaction processes.…”

Section: Mxolisi Brendon Shongwe Et Alsupporting

confidence: 83%

“…[27] in their report, it was ate containing solution than at different magnifications. The pits t of corroded region after they were exposed in the corrosive environment for the different samples showing an indication of how aggressive was the corrosive solution per environment, the alloy is characterized by much larger pits as an indication that the corrosive liquid penetrated much Figure 5 (b2)) agnifications of 1000x show that corrosion took place Figure 6 shows SEM images after corrosion in 3.5% NaCl at different magnifications.…”

Section: Micrographs Of Samples After Corrosion In 1 M H 2 So 4 and 3mentioning

confidence: 87%

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Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl

Shongwe¹,

Makena²,

Ajibola³

et al. 2018

Bull. Chem. Soc. Eth.

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ABSTRACT. Effect of ternary additions on electrochemical behavior of Ni-Fe binary alloys developed by Spark Plasma Sintering (SPS) were investigated and reported. All specimens revealed common passivity behavior in H2SO4. Both binary and ternary alloys did not reveal passivity region under saline conditions. The alloys have lower corrosion rates in NaCl than in H2SO4. Binary Ni50Fe50 alloy is characterized by large pits in H2SO4 and homogeneous corrosion on surface in NaCl. Ni50Fe40Ta10 shows better passivity in 1 M H2SO4 and Ni50Fe40Al10 has the lowest corrosion rate in 3.5 wt.% NaCl.

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Section: Mxolisi Brendon Shongwe Et Alsupporting

confidence: 83%

Section: Micrographs Of Samples After Corrosion In 1 M H 2 So 4 and 3mentioning

confidence: 87%

Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl

Shongwe¹,

Makena²,

Ajibola³

et al. 2018

Bull. Chem. Soc. Eth.

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“…These difficulties can be obviated by plotting the real and imaginary components of the impedance ͑see, for example, Betova et al 17 ͒. The real part of the impedance, shown in Fig.…”

Section: ͓5͔mentioning

confidence: 99%

Enhanced Graphical Representation of Electrochemical Impedance Data

Orazem

Pébère²,

Tribollet³

2006

J. Electrochem. Soc.

429

270

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Bode plots, corrected for Ohmic resistance, logarithmic plots of the imaginary component of the impedance, and effective capacitance plots are shown to be useful complements to the more traditionally used complex-plane and Bode representations for electrochemical impedance data. The graphical methods are illustrated by synthetic data and by experimental data associated with corrosion in saline environments. Bode plots are shown, in particular, to be confounded by the influence of electrolyte resistance. The plots proposed here provide useful guides to model development for both reactive and blocking systems. The logarithmic plots of the imaginary component of the impedance and effective capacitance plots are useful for all impedance data, and the correction for Ohmic resistance in Bode plots is useful when the solution resistance is not negligible. 12 Graphical methods provide the first step toward interpretation and evaluation of impedance data. A number of authors have described graphical methods based on a deterministic model for a given process. Mott-Shottky plots of 1/C sc 2 as a function of potential are used to obtain flatband potentials and doping levels characteristic of semiconducting systems.1 A graphical method was reported by Tribollet et al. that can be used to extract Schmidt numbers from experimental data in which the convective diffusion impedance dominates.2 The technique accounts for the finite value of the Schmidt number. Graphical methods in terms of a dimensionless frequency scaled by rotation speed are commonly used for the interpretation of electrohydrodynamic impedance measurements.3 Jansen and Orazem describe a graphical superposition of impedance data collected at different temperatures that reveals the influence of a single dominant activation-energy controlled process in solid-state systems.4 When a specific model is not postulated, typically two types of graphical representations are used: complex-impedance-plane plots, often called Nyquist plots, and Bode plots. [5][6][7] The Bode representation consists of the logarithm of impedance magnitude and the phase angle, both plotted as a function of frequency on a logarithmic scale. These types of representation have become the standard in impedance analysis for any complex quantity, e.g., admittance, complex capacitance, and electrohydrodynamic impedance, as well as electrochemical impedance.The object of this work is to demonstrate the limitations of the usual methods for representing impedance data and to suggest some useful alternatives. The proposed graphical methods are illustrated both by synthetic data and by experimental data associated with corrosion of a magnesium alloy AZ91 in saline environments. Synthetic DataThe methods for graphical representation and interpretation of electrochemical impedance are presented here for data characteristic of active and blocking electrodes. The classification of active systems is represented by a Randles circuit, as presented in Fig. 1a. The classification of blocking systems is represented ...

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“…The growth and the dissolution of the film can be regarded as a slow reaction process that occurs in parallel to the transpassive dissolution of the metal through the film [4]. Several investigations have determined that the passive film on stainless steel is mainly a mixture of iron (Fe) and chromium (Cr) oxides/hydroxides that are enriched in Cr compared with the bulk composition [1].…”

Section: Introductionmentioning

confidence: 99%

Transpassivity characterization of the alloy UNS N08367 in a chloride-containing solution

Karayan

Maya-Visuet

Castaneda

2014

J Solid State Electrochem

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We investigate the transpassivity of superaustenitic stainless steel UNS N08367 in 2.5 M LiCl solution by using cyclic potentiodynamic polarization (CPP), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS). The CPP curve exhibits negative hysteresis, which indicates a transpassive dissolution process instead of pitting corrosion. The transition from the passive region to the transpassive region is characterized by EIS and equivalent circuit analysis. During the transpassive dissolution of the N08367 alloy, two reactions of adsorbed intermediates are dominant, as indicated by the two inductive loops at the transpassive region. The first inductive loop is associated with the faster reaction, i.e., the adsorption of Fe intermediates. This fast reaction is significantly influenced by the preferential dissolution of Fe during the transpassive dissolution. The second inductive loop is correlated with the adsorption of the Cr intermediate. In contrast to Fe, the Cr content on the surface increases in the transpassive region compared with the content in the passive region. The XPS spectra support the time and frequency domain approach for the preferential dissolution, and the dominant species resulted from the interfacial processes at the transpassive region.

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The transpassive dissolution mechanism of highly alloyed stainless steels

Cited by 59 publications

References 18 publications

Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl

Effects of ternary metal additions on corrosion of spark plasma sintered Ni-Fe alloys in H2SO4 and NaCl

Enhanced Graphical Representation of Electrochemical Impedance Data

Transpassivity characterization of the alloy UNS N08367 in a chloride-containing solution

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