Corrosion and stability of cementite films prepared by electron shower

Yumoto, Hisami; Nagamine, Yumi; Nagahama, J.; Shimotomai, M.

doi:10.1016/s0042-207x(01)00467-5

Cited by 35 publications

(20 citation statements)

References 5 publications

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“…43 Yumoto et al demonstrated that the surface of the cementite was oxidized naturally at room temperature, and the oxide film on the cementite was not corroded even in a 3 mass% NaCl solution and was protected from corrosion. 12 Therefore, it was concluded that the pits are initiated in the ferrite lamellae, and the pit then proceeds along the lamellar structure via selective dissolution of the ferrite lamellae. Then, the dissolution of the ferrite lamellae brings about acidification and chloride accumulation on the corroded area, causing the passive-active transition of the pearlite to spread isotropically.…”

Section: C266mentioning

confidence: 99%

Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions

Kadowaki

Muto

Sugawara

et al. 2017

J. Electrochem. Soc.

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The initiation site and morphology during the early stage of pitting on AISI 1045 carbon steel that has a microstructure of primary ferrite and pearlite were investigated in boric-borate buffer solutions with and without NaCl at pH 8.0. The pits initiated by micro-scale polarization were in the pearlite only and not in primary ferrite. In situ real-time observations during the micro-scale polarization of pearlite in a boric-borate buffer solution with 100 mM NaCl indicated that the pits were polygonal or rod-like in shape. In addition, it was found that the pit growth direction was the same as that of the pearlite lamellae that consisted of ferrite and cementite. Field-emission electron probe micro analysis detected segregated points of sulfur in the ferrite lamellae. On the basis of their etching behavior in 3% nital, the corrosion resistance of the cementite was estimated to be higher than that of the ferrite lamellar structure. Thus, pits readily initiated in the ferrite lamellae and proceeded along the ferrite lamellae. Ferrite-pearlite steel is widely used in the production of bars, plates, steel wires, etc.1-3 because of its high strength, ductility, toughness, wear resistance, and low cost.3-5 Pearlite has a lamellar structure that consists of ferrite and cementite (Fe 3 C) phases. A fine pearlite structure improves the mechanical properties of steels in terms of strength and ductility.6-8 While ferrite-pearlite steels exhibit excellent mechanical properties, their pitting corrosion resistance is relatively low. It is widely believed that the boundaries between the different phases act as initiation sites for localized corrosion in chloride environments. 9,10When ferrite-pearlite steel that does not undergo any surface treatment is exposed to chloride environments, the steel readily suffers from pitting corrosion. Although the steel is successfully protected from corrosion by coating and/or painting, to prolong their service life and improve their reliability, it is necessary to elucidate the initiation mechanism of pitting on ferrite-pearlite steel.The pitting corrosion process involves two stages: initiation and propagation.11 In chloride environments, pitting is initiated by a breakdown of the passive film on steel during a local active dissolution process that exposes the bare steel surface to the environment. This film-free dissolution involves the hydrolysis reaction of metal cations and results in acidification. Chloride ions migrate into the pit to maintain electrical neutrality, and the simultaneous accumulation of chloride ions combined with the high level of acidification accelerates the active dissolution inside the pit. There have been many reports about the propagation stage of pitting corrosion in ferrite-pearlite steels. A comparison of the active dissolution rates and the electrochemical properties of ferrite and cementite have been widely discussed. It is commonly believed that cementite has a lower dissolution rate than ferrite. Yumoto et al. synthesized stoichiometric Fe 3 C films with...

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Section: C266mentioning

confidence: 99%

Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions

Kadowaki

Muto

Sugawara

et al. 2017

J. Electrochem. Soc.

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“…The opposite is the case for the oxidation of our soot types. However, the shoulder can also be derived from the combustion of Fe carbides that have been shown to oxidize in this temperature range in air (Tajima and Hirano 1990;Yumoto et al 2002).…”

Section: Oxidation Reactivitymentioning

confidence: 99%

Impact of Fe Content in Laboratory-Produced Soot Aerosol on its Composition, Structure, and Thermo-Chemical Properties

Bladt

Schmid

Kireeva

et al. 2012

Aerosol Science and Technology

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Soot aerosol, which is a major pollutant in the atmosphere of urban areas, often contains not only carbonaceous matter but also inorganic material. These species, for example, iron compounds, originated from impurities in fuel or lubricating oil, additives or engine wear may change the physico-chemical characteristics of soot and hence its environmental impact. We studied the change of composition, structure, and oxidation reactivity of laboratory-produced soot aerosol with varying iron content. Soot types of various iron contents were generated in a propane/air diffusion flame by adjusting the doping amount of iron pentacarbonyl Fe(CO) 5 to the flame. Scanning electron microscopy (SEM)/energy-dispersive Xray spectroscopy (EDX) was combined with cluster analysis (CA) to separate individual particles into definable groups of similar chemical composition representing the particle types in dependence of the iron content in soot. Raman microspectroscopy (RM) and infrared spectroscopy were applied for the characterization of the graphitic soot structure, hydrocarbons, and iron species. For the analysis of soot reactivity, temperature-programmed oxidation

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“…Introduction Nanocrystalline iron carbide Fe 3 C (cementite) is a very important compound for potential applications in catalysis, gas sensors and in possible reduction of the cost required to produce bulk quantities of metallurgical materials [1][2][3][4][5]. The mechanical properties [6] of this compound are especially important in ferrous metallurgy [7]. Recently, ferromagnetic resonance (FMR) has been used to study the iron carbide nanoparticles dispersed in a nonmagnetic matrix [8,9].…”

mentioning

confidence: 99%

Temperature dependence of FMR spectrum of Fe₃C magnetic agglomerates

Guskos

Typek

Maryniak

et al. 2005

J. Phys.: Conf. Ser.

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Corrosion and stability of cementite films prepared by electron shower

Cited by 35 publications

References 5 publications

Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions

Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions

Impact of Fe Content in Laboratory-Produced Soot Aerosol on its Composition, Structure, and Thermo-Chemical Properties

Temperature dependence of FMR spectrum of Fe₃C magnetic agglomerates

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Corrosion and stability of cementite films prepared by electron shower

Cited by 35 publications

References 5 publications

Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions

Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions

Impact of Fe Content in Laboratory-Produced Soot Aerosol on its Composition, Structure, and Thermo-Chemical Properties

Temperature dependence of FMR spectrum of Fe3C magnetic agglomerates

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Temperature dependence of FMR spectrum of Fe₃C magnetic agglomerates