Characterization and corrosion behavior of high-chromium white cast irons

Neville, Anne; Reza, Faisal; Chiovelli, S.; Revega, T.

doi:10.1007/bf02586208

Cited by 38 publications

(30 citation statements)

References 20 publications

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“…The black lines occur in the element depleted region (e.g., Cr) that envelopes chromium-rich zones in the bulk carbide. Therefore, the corrosion attack at this site can be caused by three factors: microgalvanic interaction between two regions, simply chromium depletion leading over corrosion resistance, and microcrevice attack [29].…”

Section: The Microstructure After Corrosionmentioning

confidence: 99%

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

et al. 2015

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This study aims to investigate the effect of Cr/ C ratio on wear and corrosion behavior of a group of highCr white cast iron (HCCI) alloys. Three different alloys of HCCI with different chemical compositions were tested against 3.5 % NaCl, 0.5 M H 2 SO 4 , and 0.5 M NaOH solutions as corrosive media. Electrochemical polarization technique has been used to determine the corrosion current density. The microstructure characteristics of HCCI alloys were analyzed by using optical microscope, SEM, EDS, and XRD. XRD analysis reveals that the microstructure of the HCCI alloys is composed of a network of chromiumrich carbides (M 7 C 3 ) in an austenitic matrix. The abrasive wear resistance of HCCI alloys was found to be rely on their chemical composition and microstructure. The corrosion resistance of the HCCI alloys strongly depends on the Cr/C ratio and the ratio of chromium content in the M 7 C 3 carbide to that in the matrix (CrM 7 C 3 /Matrix). The experimental results of this study showed that the alloy HCCI-2 with the lower Cr/C ratio exhibited the lowest abrasive wear loss while the alloy HCCI-1 with higher Cr/ C ratio exhibited the highest abrasive wear loss. On the other hand, the HCCI-1 alloy was the most corrosion resistant and revealed the lowest current density. In addition, the corrosion current density of all specimens is elevated in 0.5 M H 2 SO 4 solution in comparison with 3.5 wt% NaCl and 0.5 M NaOH solutions.

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Section: The Microstructure After Corrosionmentioning

confidence: 99%

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

et al. 2015

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“…There is no evidence in the topography line scan of narrow gaps or crevices between the carbides and the matrix. The pre-existence of narrow crevice sites has been suggested by other researchers as a possible cause of localized corrosion of high-Cr WCIs [23]. The corresponding Volta potential map and the line scan in Fig.…”

Section: High-resolution Surface Analysis Of 30crwcimentioning

confidence: 62%

“…slurry pumps, where abrasion and/or erosion in aqueous environments occur [21,22]. Most studies found in the literature have concentrated either on the corrosion behaviour of high-Cr WCIs [23][24][25] or on their wear characteristics in air and in slurries [21,[26][27][28][29]. Only in a few studies the synergistic approach has been used, either based on the ASTM G119 methodology or slightly modified [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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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“…analyzed the corrosion behavior of multiphase materials. They concluded that differences in E corr between the microstructural constituents of multiphase materials act as a driving force which favors the selective corrosion process (Ref 20,44,45).…”

Section: Corrosion Behavior and Degradation Mechanisms Of The Mmcsmentioning

confidence: 99%

Corrosion and Erosion-Corrosion Processes of Metal-Matrix Composites in Slurry Conditions

Flores

Neville

Kapur

et al. 2011

J. of Materi Eng and Perform

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The corrosion and erosion-corrosion (EC) processes of four metal-matrix composites (MMCs) in a simulated cooling water environment have been assessed in this article. The MMCs consisted of two Ni-base and two Fe-base matrices alloyed with different concentrations of chromium, molybdenum, boron, silicon, and carbon; the matrices were reinforced with tungsten carbide (WC) particles. The corrosion behavior has been investigated using a combination of potentiostatic polarization and post-tests surface analysis. The EC processes were studied by in situ electrochemical techniques measuring the current density and corrosion potential response at different slurry temperatures and sand content. At static conditions it was found that as the temperature increased, there was a transition from a homogeneous corrosion of the matrix to an interfacial corrosion mechanism. The Ni-base MMCs showed a better corrosion resistance and interestingly a highly alloyed matrix did not significantly improved MMCÕs corrosion resistance. In the in situ EC tests, the Fe-base MMCs showed a constant increase in the current density at all sand contents. Whereas, significant changes were not observed in the Ni-base MMCs below 0.5 g/L. Although sand content had an effect on the monitored current density (the current increased as the sand content increased) this effect was less pronounced above 3 g/L.

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Characterization and corrosion behavior of high-chromium white cast irons

Cited by 38 publications

References 20 publications

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

Wear and Corrosion Behavior of High-Cr White Cast Iron Alloys in Different Corrosive Media

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

Corrosion and Erosion-Corrosion Processes of Metal-Matrix Composites in Slurry Conditions

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