Corrosion of Cr23C6 coated Q235 steel in wet atmospheres containing Na2SO4 at 750 °C

Wu, Shoujun; Fei, Yunlong; Guo, Bingbing; Jing, Lina

doi:10.1016/j.corsci.2015.08.008

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…However, the presence of Fe 3 C in the carburized steel could be observed from the increase in hardness near the surface of the steel, as reported in other papers. 18,19) Moreover, SEM images of the carburized steel could also reveal the presence of Cr 23 C 6 , with the morphology corresponding to that of the steel synthesized by Wu et al, 20) formed on the steel surface. The images also revealed that the grain size and the quantity of the carbide increased with increasing carburizing temperature caused by the increased applied electric power.…”

Section: Discussionmentioning

confidence: 78%

“…However, if a large quantity of Cr 23 C 6 is formed to obtain a uniform Cr 23 C 6 layer, as in the case of the steel carburized at 300 W, the corrosion rate could decrease. 20) There was very low quantities of carbide and oxide formed, as observed on the SEM images of the steel carburized at 100 W before and after the polarization test, respectively. It is believed that a small quantity of carbon was dissolved into the steel irregularly, owing to the low carburizing temperature.…”

Section: Discussionmentioning

confidence: 91%

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Tribological and corrosion behaviors of carburized AISI 4340 steel

Thong-on¹,

Boonruang²

2015

Jpn. J. Appl. Phys.

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AISI 4340 steel is widely used in automotive and aircraft industries as gear components. In such applications, surface hardening processes such as carburizing are required in order to improve the life time of the components. There are many studies showing the tribological behavior of the carburized steel, but the corrosion behavior has not yet been clarified. This paper reports on both tribological and corrosion behaviors of the carburized AISI 4340 steel. Factor associated with carburizing, such as the quantities of deposited carbon, dissolved carbon, and formed Cr23C6 and Fe3C, affect the tribological and corrosion behaviors of the steel by improving hardness, friction, lubrication, and wear resistance; but corrosion resistance is reduced. The dissolved carbon affects the formation of the oxide layer of the carburized steel, by obstructing the continuous oxide layer formation and by decreasing the chromium content of the steel, leading to the decrease in the corrosion resistance of the steel.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 91%

Tribological and corrosion behaviors of carburized AISI 4340 steel

Thong-on¹,

Boonruang²

2015

Jpn. J. Appl. Phys.

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“…From the calculated Gibbs free energies (Figure 18), chromium should oxidize first, then chromium spinels are formed, afterwards the oxidation of M 23 C 6 carbide starts, followed by the oxidation of iron and finally carbon. The oxidation of the carbides themselves has been reported by several authors [49][50][51][52][53]. It was found that M 23 C 6 carbides start to oxidize in the air atmosphere at elevated temperatures and thus can affect the oxidation kinetics, while MC carbides do not have a much effect on the oxidation kinetics.…”

Section: Discussionmentioning

confidence: 89%

High-Temperature Oxidation Behaviour of AISI H11 Tool Steel

Balaško

Vončina

Burja

et al. 2021

Metals

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The high-temperature oxidation of hot-work tool steel AISI H11 was studied. The high-temperature oxidation was investigated in two conditions, the soft annealed condition, and the hardened and tempered condition. First, calculations of the compositions of the oxide layers formed were carried out using the CALPHAD method. The samples were oxidised in a chamber furnace and in a simultaneous thermal analysis instrument, for 100 h in the temperature range between 400 °C and 700 °C. The first samples were used for metallographic (optical microscopy and scanning electron microscopy) and X-ray diffraction analysis of the formed oxide layers, and the second ones for the analysis of the oxidation kinetics by thermogravimetric analysis. Equations describing the high-temperature oxidation kinetics were derived. The kinetics can be described by three mathematical functions, namely: exponential, parabolic, and cubic. However, which function best describes the kinetics depends on the oxidation temperature and the thermal condition of the steel. Hardened and tempered samples have been shown to oxidise less, resulting in a slower oxidation rate. The oxide layers consist of three sublayers, the inner one being spinel-like oxide (Fe, Cr)3O4, the middle one a mixture of magnetite and hematite and the outer one of hematite. At 700 °C there is also some wüstite in the inner oxide sublayer of the soft annealed sample.

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