Thermal Transformation of Oxide and Hydroxide Minerals in Chromite and Manganese Ores

Samal, S. K.; Mohanty, Manoja Kumar; Mishra, B.; Mishra, Subash Chandra

doi:10.1007/s42461-021-00382-2

Cited by 2 publications

(2 citation statements)

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“…Anodic branch of the Tafel plot shows passivation that occurred at the surface of coating due to the presence of the chromite phase, evidence of Cr 2 O 3 performance as a passive film was reported elsewhere. 34 , 57 The presence of stable phases in chromite coating, makes it an excellent candidate for future applications related to corrosion resistance properties.…”

Section: Resultsmentioning

confidence: 99%

“…Elemental analysis done by EDS in Table shows oxygen (O) as a major element in powder due to the oxide nature of constituents, as evident from Table . Chromium oxide is above 50% which makes it metallurgical grade and significant amount of iron oxide makes it iron-rich chromite ore. , Oxides of magnesium and aluminum are also present in reasonable amounts, and based on composition, we can write the general chemical formula as (Mg, Fe)O. (Cr, Al, Fe) 2 O 3 . , A small amount of silica present in the sample is the main impurity associated with most chromite minerals …”

Section: Resultsmentioning

confidence: 99%

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Development and Characterization of Natural Chromite Coating on Metal Substrate Using the Plasma Spray Process

et al. 2023

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Natural materials are gaining interest as coating feedstock because their “quality to cost” ratio is better and they are more environmentally friendly than most of the synthetic ceramics. They give sufficient protection to metal surfaces against harsh conditions such as corrosion, wear, and high temperature. In the current study, chromite mineral was beneficiated and reduced to two different sizes to be used as feedstock material for thermal spray coating. Powders were upgraded by gravity and magnetic separation, respectively, and thermally sprayed onto mild steel samples by using atmospheric plasma spray (APS) equipment. Morphology, structure, phases, elemental distribution of chromite powder, and coatings were studied using field emission scanning electron microscopy, X-ray diffraction, X-ray fluorescence spectroscopy, and energy-dispersive X-ray spectroscopy. Tribological properties of APS chromite coatings were investigated by using a ball-on-disk tribometer, and corrosion resistance properties were evaluated by carrying out potentiodynamic polarization testing in 3.5% NaCl solution. It is observed that the coating has better wear and corrosion resistance and is worn by abrasive wear that includes scratching and particles pull out. Coating efficiency, surface morphology, and microhardness of the coating developed by fine powder were better than those of coarse powder coating.

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Section: Resultsmentioning

confidence: 99%