Development of the Electrochemical Theory of Metallic Corrosion

Tomashov, N. D.

doi:10.5006/0010-9312-20.1.7t

Cited by 125 publications

(75 citation statements)

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“…The obvious increase in ACM current is probably because of the decrease of thickness of water layer associated with promotion of diffusion controlled oxygen reduction reaction. [33][34][35] Though the increase in corrosion rate according to the enhancement of oxygen reduction reaction does not directly increase hydrogen entry, the increase in dissolved Fe 2+ ions and decrease of pH caused by the hydrolysis of Fe 2+ ions maybe gives rise to promote the hydrogen entry efficiency during drying process. The effect of rust layer and corrosion rate will be discussed later.…”

Section: Corrosion Behaviormentioning

confidence: 99%

Hydrogen Entry Behavior into Iron and Steel under Atmospheric Corrosion

Akiyama

Shinohara

et al. 2013

ISIJ Int.

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Electrochemical hydrogen permeation tests of pure Fe sheets rusted by cyclic corrosion test (CCT) and atmospheric exposure were carried out under controlled temperature and humidity to investigate the influence of atmospheric corrosion on the hydrogen entry behavior. The hydrogen entry into the Fe specimens rusted by CCT increased under wet condition, and the hydrogen entry was increased with the CCT cycle number. During drying process after the wetting, hydrogen entry was further enhanced and a peak of hydrogen current was observed. The peak hydrogen permeation current tended to increase with the growth of rust layer, and the peak value of the hydrogen permeation current became remarkably higher than that at the highest humidity when the rust layer was relatively thick. Similar enhancement of hydrogen entry into an outdoor-exposed specimen was also observed during drying. Drying process after CCT resulted in an increase in hydrogen content of 5 mm-thick steel specimens measured by means of thermal desorption analysis, indicating the enhancement of hydrogen entry during drying process and showing a good agreement with the electrochemical hydrogen permeation test results. It is required to take into consideration the enhanced hydrogen entry to estimate concentration of hydrogen from the environment.

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Section: Corrosion Behaviormentioning

confidence: 99%

Hydrogen Entry Behavior into Iron and Steel under Atmospheric Corrosion

Akiyama

Shinohara

et al. 2013

ISIJ Int.

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“…For the steel substrate, the iron dissolution is balanced with the oxygen reduction [24], and during the period of 1st-13th EIS measurements, the oxygen reduction rate increases due to the ready availability of dissolved oxygen from the air to the thinning electrolyte film, leading to the increased corrosion rate and decreased high-frequency impedance and low-frequency impedance as the EIS measurement proceeds. Besides, the increased concentration of Cl -and SO 4 2-in the thinning electrolyte film contributes to an enhanced electrical conductivity of the electrolyte, accelerating the steel corrosion process, which is an electrochemical one [25]. Therefore, the increased concentration of Cl -and SO 4 2-in the thinning electrolyte film may also be responsible for the decreased high-frequency impedance and low-frequency impedance during the period of 1st-13th EIS measurements.…”

Section: Electrolyte Thickness and Eis Measurementsmentioning

confidence: 97%

Numerical Approach for Atmospheric Corrosion Monitoring Based on EIS of a Weathering Steel

Thee

Liu

Dong

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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Electrochemical impedance spectroscopy (EIS) and film thickness measurement have been employed to study the atmospheric corrosion of a weathering steel covered with a thin electrolyte layer in a simulated coastal-industrial atmosphere. The results indicate that the corrosion rate is a function of the covered electrolyte thickness and the wet/dry cycle. Within each wet/dry cycle, the increased corrosion rate is related to the increased Cl -and SO 4 2-concentration and an enhancement of oxygen diffusion rate with the evaporation of the electrolyte. In addition, the corrosion rate increases during the initial corrosion stage and then decreases as the wet/dry cycle proceeds. Moreover, one mathematical approach based on the numerical integration method to obtain corrosion mass loss of steel from the measurements of EIS has been developed, and this would be useful for the development of indoor simulated atmospheric corrosion tests.

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“…Corrosion process in atmospheric environments is very different from that in the bulk solutions because corrosion proceeds under a thin electrolyte layer during periodic wet and dry cycle. Under thin electrolyte layer, the diffusion of oxygen is greatly enhanced 1,2 . But, the solvation capacity of a thin electrolyte layer for the dissolved species becomes very limited, which affects the process of formation and transformation of corrosion products 3 .…”

Section: Introductionmentioning

confidence: 99%

“…In the wet condition, an increase in the thickness of electrolyte layer decreases the corrosion rate, which is controlled by diffusion process. 2 Highest corrosion rate is attained in transition from moist (anodic control) to wet corrosion (cathodic control). The critical thickness of electrolyte layer for maximum corrosion rate has been estimated to be approximately 20-30µm 1,2,4 .…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Monitoring of Galvanized Steel in Simulated Wet-Dry Cyclic Condition in 0.05 M NaCl Solution

Yadav

1970

Sci World

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Abstract:The corrosion monitoring of galvanized steel in 1 h wet and 7 h dry cyclic condition in 0.05 M NaCl has been carried out using AC impedance technique. During the wet-dry cycles, the polarization resistance, R p , and solution resistance, R s , were continuously monitored. The instantaneous corrosion rate of the coating was estimated from the obtained R p -1 and time of wetness (TOW) was determined from the R s values. The corrosion potential, E corr , was measured twice a day during the immersion period of wet-dry cycle. The corrosion was accelerated by the wet-dry cycles in the early stage followed by a decrease in the final stage of wet-dry cycle. The corrosion potential shifted to more negative direction for the first 8 cycles due to dissolution of air formed oxide. A gradual shift in the corrosion potential with the progress of corrosion in the later stage of the wet-dry cycle was observed due to deposition of corrosion products. The corrosion mechanism of galvanized steel is discussed based on the results of corrosion monitoring and corrosion potential variation.

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Development of the Electrochemical Theory of Metallic Corrosion

Cited by 125 publications

References 0 publications

Hydrogen Entry Behavior into Iron and Steel under Atmospheric Corrosion

Hydrogen Entry Behavior into Iron and Steel under Atmospheric Corrosion

Numerical Approach for Atmospheric Corrosion Monitoring Based on EIS of a Weathering Steel

Corrosion Monitoring of Galvanized Steel in Simulated Wet-Dry Cyclic Condition in 0.05 M NaCl Solution

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