NanoSIMS investigation of passive oxide films on high-Cr cast iron

Salasi, Mobin; Stachowiak, Gwidon; Kilburn, Matt R.

doi:10.1016/j.corsci.2012.11.003

Cited by 22 publications

(26 citation statements)

References 32 publications

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“…Quantitative EMPA measurements determined that although the Cr content in the matrix distanced from the carbide/matrix boundaries remains at around 11.5-12.5 wt% (sufficient to form a chromium oxide-based passive film), in the vicinity of the boundaries it can drop to 9.5 wt% [37]. A more sensitive NanoSIMS technique has confirmed the EMPA results [37].…”

Section: High-resolution Surface Analysis Of 30crwcisupporting

confidence: 54%

“…A more sensitive NanoSIMS technique has confirmed the EMPA results [37]. A novel approach to the SIMS method, which included a deposition of a thin layer of cesium prior to implanting primary ions, allowed the authors to resolve the discrete oxide sub-layers [37].…”

Section: High-resolution Surface Analysis Of 30crwcimentioning

confidence: 73%

“…The passive layer forms due to a sufficient amount of chromium in solid solution within the iron-rich matrix [14,36]. However, since the microstructure of 30CrWCI contains a high volume fraction of carbides, about 46 vol%, and the distribution of Cr in the matrix is nonhomogeneous, the composition and structure of the passive films vary over the surface [37].…”

Section: Materials and Testing Conditionsmentioning

confidence: 99%

“…Since the wear scar is composed of continuously changing mixture of depassivated and repassivating sites, and the fraction of the depassivated area is hard to determine, the corrosion current densities under abrasion can be underestimated when the entire wear scar area in used in calculation. In multiphase alloys such as high-Cr WCIs the uncertainty is compounded by the non-uniform characteristics of the passive film covering the surface [37].…”

Section: Abrasion Corrosion Potentiostatic Polarization Testsmentioning

confidence: 99%

“…In the past several years, the authors have studied corrosion and three-body abrasion corrosion behaviour of hypo-and hypereutectic high-Cr WCIs in neutral and alkaline aqueous solutions with aim to provide new insights into the topic [14,15,37]. Various electrochemical techniques such as polarization resistance, potentiostatic and potentiodynamic polarization and EN have been tried.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Three-Body Abrasion Corrosion Studies of High-Cr Cast Irons: Benefits and Limitations of Tribo-electrochemical Methods

Salasi

Stachowiak

2015

J Bio Tribo Corros

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High-Cr white cast irons (WCIs) are multiphase alloys commonly used in aqueous industrial environments in applications that require both high abrasion and high corrosion resistance. Various electrochemical techniques can be useful in elucidating tribocorrosion characteristics of metallic materials undergoing wear in a corrosive environment. This study is focused on the interpretation of electrochemical measurements applied to three-body abrasion corrosion contacts of high-Cr WCIs. Particular attention has been paid to determine whether tribo-electrochemical data can pick up any effects that the multiphase microstructure of WCIs may have on the tribocorrosion characteristics, especially in environments containing chloride ions. Since both wear and corrosion of multiphase alloys are usually not uniform, their tribocorrosion behaviour is difficult to study and is still poorly understood. The experimental results are discussed in terms of benefits and limitations of tribo-electrochemical techniques such as polarization (potentiostatic, potentiodynamic) and electrochemical noise (galvanic coupling, potentiostatic) in studying abrasion corrosion behaviour of high-Cr WCIs. The application of high-resolution surface analysis techniques (microprobe, NanoSIMS, C-AFM and SKPFM), used in support of the electrochemical data interpretation, is also demonstrated.

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Section: High-resolution Surface Analysis Of 30crwcisupporting

confidence: 54%

Section: High-resolution Surface Analysis Of 30crwcimentioning

confidence: 73%

Section: Materials and Testing Conditionsmentioning

confidence: 99%

Section: Abrasion Corrosion Potentiostatic Polarization Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Three-Body Abrasion Corrosion Studies of High-Cr Cast Irons: Benefits and Limitations of Tribo-electrochemical Methods

Salasi

Stachowiak

2015

J Bio Tribo Corros

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Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)

2016

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The Pourbaix diagrams also known as the E-pH diagrams were constructed for hardfacing alloys based on three chromium carbides: Cr 7 C 3 , Cr 23 C 6 and Cr 3 C 2 at 298 K (25°C). Using the thermodynamic data available for the main species at 298 K (25°C), Pourbaix diagrams for the chromium carbides are constructed at a concentration of 10-6 M of aqueous species. It was found that the diagrams are able to explain the results of experimental work performed on chromium carbides in NaOH. It was found that the stability of carbides is described only by the immune region of the Pourbaix diagram for carbides. Although passive region has been included in the study, it was unclear from the literature if there was a passive film or how protective it was.

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Corrosion Behaviour of High-Chromium White Iron Hardfacing Alloys in an Alkaline Solution

Marimuthu

Kannoorpatti

2016

J Bio Tribo Corros

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Hardfacing alloys of high-chromium white irons (HCWI) deposited using welding are well known for their wear resistance. These materials are applied in conditions needing not only wear resistance but also corrosion. In this study, the HCWI alloys were exposed to alkaline solutions of pH 14. Anodic polarization technique was used to study the corrosion behaviour. The experimental results found that corrosion occurs on carbides in preference to the matrix. Pourbaix diagrams of carbides were found to be very useful in explaining the corrosion behaviour of the hardfacing alloys. The significance of carbide corrosion to the use of hardfacing alloys is discussed. Possible methods to mitigate corrosion are proposed.

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NanoSIMS investigation of passive oxide films on high-Cr cast iron

Cited by 22 publications

References 32 publications

Three-Body Abrasion Corrosion Studies of High-Cr Cast Irons: Benefits and Limitations of Tribo-electrochemical Methods

Three-Body Abrasion Corrosion Studies of High-Cr Cast Irons: Benefits and Limitations of Tribo-electrochemical Methods

Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)

Corrosion Behaviour of High-Chromium White Iron Hardfacing Alloys in an Alkaline Solution

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