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

Marimuthu, Varmaa; Kannoorpatti, Krishnan

doi:10.1007/s40735-016-0056-x

Cited by 8 publications

(10 citation statements)

References 23 publications

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“…HCWCI-3 experienced slightly higher corrosion resistance than HCWCI-1. This influence of Cr on the resistance of the high-chromium cast iron to corrosion was also observed by other researchers [ 51 ].…”

Section: Resultssupporting

confidence: 84%

Electrochemical Corrosion Behaviour of Different Grades of WC-Co, High-Cr White Cast Irons and Hadfield Steel in 1 M Sulphuric Acid

2021

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Electrochemical polarisation tests were carried out on three grades of WC-Co cemented carbides to investigate the corrosive behaviour of the hardmetals and rank them as viable protective liners for chutes and skips in the mining industry. The cobalt binder content and WC particle size varied. The binder content ranged from 6–12 wt%, and the grain size of the WC particles ranged from 0.4–2.3 µm. The performance of the WC-Co hardmetal was compared to three different grades of high chromium white cast irons and Hadfield steel. The cast irons varied in both their chromium content and the morphology of the Cr-rich primary carbides. Potentiodynamic polarisation and linear polarization resistance scans were used to determine the corrosion current density and other electrochemical parameters. The microstructural characteristics of the samples were analysed using Scanning Electron Microscope(SEM) with Energy Dispersive Spectroscopy (EDS), and optical microscopy. The potentiodynamic scans revealed that, although the WC-Co alloys were found to have generally improved corrosion resistance, it was the high-Cr white cast iron (22 wt% Cr) that recorded the lowest corrosion current density and therefore displayed the best resistance against corrosive attack in 1 M H2SO4. The Hadfield steel exhibited the poorest resistance to corrosion and therefore, suffered the most degradation to its exposed surface.

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Section: Resultssupporting

confidence: 84%

Electrochemical Corrosion Behaviour of Different Grades of WC-Co, High-Cr White Cast Irons and Hadfield Steel in 1 M Sulphuric Acid

2021

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“…The Mulliken charges of Cr 3 C 2 are listed in table 4. From experimental findings of Varmaa et al [19] it was observed that the metal alloy carbides exhibited a ratio of 2:1 for Cr:Fe. Hence, in this study the effect of replacing one Cr atom with Fe-atom, out of the three Cr atoms in Cr 3 C 2 will be investigated.…”

Section: Electronic Properties Of Fe-substituted Chromium Carbidesmentioning

confidence: 96%

“…Inclusion of Fe atoms in chromium carbides would change the physical properties of chromium carbides [17,18]. The stability of the chromium carbides containing Fe atoms will also be affected in corrosive environments [19]. However, a systematic theoretical report on how the electronic structures of the chromium carbide phases are modified due to the introduction of Fe into the carbides is not yet reported.…”

Section: Introductionmentioning

confidence: 99%

Structural and electronic properties of chromium carbides and Fe-substituted chromium carbides

Ganguly

Murthy

Kannoorpatti

2020

Mater. Res. Express

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Chromium carbides are coated over base metal (Fe) to increase wear and corrosion resistance. The electronic structure and bonding properties for chromium carbide bulk phases (Cr 3 C 2 , Cr 7 C 3 and Cr 23 C 6 ) and Fe-substituted chromium carbides is investigated using Density Functional Theory (DFT). The bonding in these carbides has been interpreted in the form of partial density of states, electron density distribution and Mulliken population method. Cr 3 C 2 exhibits the strongest covalent character while Cr 7 C 3 displays the highest metallicity. Cr 3 C 2 showed the highest stability among the chromium carbide phases. In the Fe-substituted chromium carbides (Cr 2 FeC 2 ), the site preference of Fe in Cr 3 C 2 system has been reported. In Fe-substituted chromium carbides also show both of metallic and covalent character and Cr 2 Fe3C 2 is found to be the most stable Fe-substituted chromium carbide system.

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“…Similarly, for pH 7 NaCl solution, the eutectic martensitic matrix was not stable due to nobler potential of carbides. The carbides corroded in the pH 7 buffer solution same as in the alkaline solution of pH 14 [23,41], whereas the eutectic austenite matrix sample showed nobler potential than a carbide sample as described in the literature [41] after extraction of carbide and eutectic austenite matrix sample in pH 14 solution.…”

Section: Corrosion Analysis Of Carbide and Eutectic Martensitic Matrimentioning

confidence: 99%

“…The study conducted by Salasi et al [23] of cast HCWI in alkaline solution (pH 12) with inclusion of chloride ions found that corrosion of eutectic austenite matrix happened mainly due to localised breakdown of passive layer. The same eutectic austenite matrix in alkaline solution was found to be relatively uncorroded resulting in the corrosion of carbides [23,41].…”

Section: Stability Of Passive Formation Of Matrix and Pourbaix Diagramsmentioning

confidence: 99%

Corrosion Behaviour of High Chromium White Iron Hardfacing Alloys in Acidic and Neutral Solutions

Marimuthu

Kannoorpatti

2016

J Bio Tribo Corros

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Hardfacing alloys of High Chromium White Irons (HCWI) were deposited on low carbon steel using Shielded Metal Arc Welding. Microstructure of HCWI consists of primary carbides, eutectic carbides and eutectic austenitic/martensitic matrix. This study investigated the corrosion behaviour of HCWI in both acid and neutral solutions. The corrosion behaviour of HCWI was evaluated using anodic polarisation technique. It was found that in acid solution at pH 1.5, corrosion occurs on eutectic austenite/martensitic matrix whereas at pH 2, the corrosion occurs on eutectic carbides. In the neutral environment at pH 7, corrosion of HCWI occurred in the eutectic austenite/martensite matrix in the presence of chloride ions, while in the buffered solution, corrosion occurred in the carbides. The results of this study show that the corrosion mechanism of HCWI for both acid and neutral environments was due to potential difference between carbides and eutectic austenite/martensitic matrix. The superimposed Pourbaix diagrams of chromium carbides with iron (Fe) and niobium carbide were useful in explaining the behaviour of HCWI in both acid and neutral solutions.

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

Cited by 8 publications

References 23 publications

Electrochemical Corrosion Behaviour of Different Grades of WC-Co, High-Cr White Cast Irons and Hadfield Steel in 1 M Sulphuric Acid

Electrochemical Corrosion Behaviour of Different Grades of WC-Co, High-Cr White Cast Irons and Hadfield Steel in 1 M Sulphuric Acid

Structural and electronic properties of chromium carbides and Fe-substituted chromium carbides

Corrosion Behaviour of High Chromium White Iron Hardfacing Alloys in Acidic and Neutral Solutions

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