Corrosion of carbon steels in high-temperature water studied by electrochemical techniques

Cheng, Y. Frank; Steward, F.R.

doi:10.1016/j.corsci.2004.01.021

Cited by 54 publications

(27 citation statements)

References 20 publications

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“…With increase of temperature, the solubility of oxygen in soaked soil decreases [13] although the oxygen diffusivity Fig. 7 Charge-transfer resistance of carbon steel in soil at different temperatures increases.…”

Section: Electrochemical Corrosion Characteristics Of Carbon Steel Inmentioning

confidence: 97%

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Temperature dependence of the electrochemical corrosion characteristics of carbon steel in a salty soil

Nie

et al. 2008

J Appl Electrochem

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The electrochemical corrosion characteristics of carbon steel in a salty soil at different temperatures were studied by measurements and analyses of potentiodynamic polarization curves, linear polarization resistance and electrochemical impedance spectroscopy. The results showed that the mass-transfer of dissolved oxygen plays an essential role in carbon steel corrosion, and the whole corrosion process is mix-controlled by both activation and masstransfer steps. Passivity can be developed on carbon steel in the soil at low temperatures. With the increase of temperature, the passive current density increases and the passive potential range decreases. When temperature is elevated to a certain value, 50°C in this system, passivity cannot be maintained and the steel is dominated by an active dissolution status. Anodic Tafel slope decreases continuously with the increase in temperature, which is mainly due to the enhanced electrode reaction rate at an elevated temperature. Simultaneously, cathodic Tafel slope increases with temperature continuously due to the decrease of the solubility of dissolved oxygen in soil. Since the diffusion activation energy is generally much smaller than the reaction activation energy, the effect of temperature on diffusion is far less than that on electrode reaction rate.

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Section: Electrochemical Corrosion Characteristics Of Carbon Steel Inmentioning

confidence: 97%

“…When temperature increases further, corrosion rate decreases. It is attributed to the significant reduction in oxygen content in aqueous solution or soaked soil, and simultaneously, the formation of a more compact oxide film on electrode surface at the elevated temperature [13]. …”

Section: Effect Of Temperature On Corrosion Rate Of Carbon Steelmentioning

confidence: 99%

Temperature dependence of the electrochemical corrosion characteristics of carbon steel in a salty soil

Nie

et al. 2008

J Appl Electrochem

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“…The Fe 2 O 3 layer is the topmost layer and the Fe 3 O 4 layer is under the Fe 2 O 3 layer [16,34]. Based on the iron corrosion theory, the corrosion of iron by water at high temperature without oxygen involves two key component parts: transport of oxygen-bearing species to the metal/oxide interface and diffusion of iron ions outwards to the solution [34,35]. The iron oxide layer becomes to grow when the concentration of iron ions reaches to a certain concentration.…”

Section: Resultsmentioning

confidence: 99%

Laser direct writing of crystalline Fe2O3 atomic sheets on steel surface in aqueous medium

Lin

Kumar

Jin

et al. 2015

Applied Surface Science

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“…In fact, it is also regarded as the key stage in the four levels of the acidic/caustic alternating corrosion. Caustic corrosion can also be called caustic embrittlement, virtually a kind of stress corrosion cracking (SCC), and is always engendered on metals that are amid caustic environment and under stresses in service, for example the boiler materials [7], the oil pipelines under soils [8], and even the nuclear materials [9]. Particularly for the carbon steels, caustic embrittlement would be induced at temperature above 40 8C [10] with NaOH solution concentration of 4-75% (wt%) [11][12][13].…”

Section: Icp-aesmentioning

confidence: 99%

Acidic/caustic alternating corrosion on carbon steel pipes in heat exchanger of ethylene plant

Gong

Yang

Cheng

et al. 2011

Materials & Corrosion

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Caustic embrittlement, a kind of stress corrosion cracking (SCC), is always encountered on materials under stresses amid caustic environment. Acidic corrosion is another familiar degradation on materials contacting acidic media. However, it has been seldom studied what effect would be resulted in on materials that are exposed to an acidic/caustic alternating environment. In this paper, failure events were discovered on the carbon steel pipes under such an alternating service condition due to frequent sharp fluctuations of the heat medium's (process water) pH values in a heat exchanger. What is more, even chloride ions and sulfur element were detected, i.e., pitting corrosion was involved as well. In order to identify the causes of the failure, matrix materials of the pipes were examined, failure defects on pipe surfaces were investigated, particularly the process water was thoroughly inspected via a series of characterization methods. Based on the analysis results, a novel four-level mechanism from microscopic scale to macroscopic scale was tentatively proposed to explain such an acidic/caustic alternating corrosion.

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Corrosion of carbon steels in high-temperature water studied by electrochemical techniques

Cited by 54 publications

References 20 publications

Temperature dependence of the electrochemical corrosion characteristics of carbon steel in a salty soil

Temperature dependence of the electrochemical corrosion characteristics of carbon steel in a salty soil

Laser direct writing of crystalline Fe2O3 atomic sheets on steel surface in aqueous medium

Acidic/caustic alternating corrosion on carbon steel pipes in heat exchanger of ethylene plant

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