Effect of dissolved oxygen, temperature, and pH on polarization behavior of carbon steel in simulated concrete pore solution

Liu, Xiahe; Macdonald, Digby D.; Mei, Wang; Xu, Yi

doi:10.1016/j.electacta.2020.137437

Cited by 24 publications

(6 citation statements)

References 60 publications

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“…In recent literature and research the Point Defect Model (PDM), developed by Macdonald [3,4], and its extensions [5][6][7] have been mostly widely explored and used to describe the film growth of oxides. The model is currently widely used for the description of passive film kinetics of different metals and alloys [8][9][10], the analysis of Mott-Schottky data [11,12] the investigation of corrosion processes [13][14][15][16][17], to describe pitting corrosion [18] and the comparison of passive film protection between different alloys [19], but there are some critical points limiting its applicability [7,20,21].…”

Section: Introductionmentioning

confidence: 99%

Modeling of electrochemical oxide film growth-a PDM refinement

Bösing

Mantia

Thöming

2022

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Modeling of electrochemical oxide film growth-a PDM refinement

Bösing

Mantia

Thöming

2022

Electrochimica Acta

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“…The number of Fe layers that can be considered altered when applying the measurement technique under study could be estimated by dividing the charge transferred in the anodic polarization (Q A ) by Q L . If the WE is in the passive state, Q L could be associated not only to the Fe oxidation, but also to the partial oxidation of the ferrous oxide (FeO) and/or ferrous hydroxide (Fe(OH) 2 ) to ferrosoferric oxide (Fe 3 O 4 ) [60][61][62].…”

Section: Discussionmentioning

confidence: 99%

“…The value of this charge, referred to as Q L , is estimated to be 0.607 mC/cm 2 . It should be noted that if the WE is in the passive state, the Q L value could be associated not only to the Fe oxidation, but also to the partial oxidation of the FeO and/or Fe(OH) 2 to Fe 3 O 4 [60][61][62].…”

Section: Analysis Of Tafel Linesmentioning

confidence: 99%

Improved Tafel-Based Potentiostatic Approach for Corrosion Rate Monitoring of Reinforcing Steel

et al. 2022

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Potential step voltammetry (PSV) was introduced in earlier works as an advantageous alternative to traditional methods for measuring corrosion rate in reinforced concrete. The present study aims to improve PSV to maximize its applicability in corrosion rate monitoring, that is, beyond the narrowly-defined steel–concrete systems in which was initially validated. It was therefore identified necessary to address the most suitable PSV pulse amplitudes to accurately obtain the Tafel lines and, therefore, corrosion rate in steel-mortar systems with well-differentiated ohmic drop. PSV findings were compared to reference methods, i.e. Tafel intersection and linear polarization resistance. As a novelty, we propose a procedure to improve the reliability of the PSV-determined Tafel lines, which is based on three protocols (P1, P2 and P3). P1 consists of a specific pulse sequence to accurately characterize the morphology of the polarization curve without disturbing the system. P2 consists of two short pulses for determining the ohmic drop compensation factor. Finally, P3 consists of a simple calculation procedure to accurately adjust the PSV pulse amplitudes (∆V) to the steel–concrete system assessed, thus obviating the need for preset values and, therefore, ensuring accurate corrosion rate results. The procedure proposed is intended to improve PSV with a view to its consolidation as a reliable tool for the unsupervised monitoring of real structures.

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“…After 1 h, OCP stabilized about −1.05 V/MSE. According to the redox potential table, this mix potential corresponds to the iron dissolution (Fe Fe 2+ + 2e ) and the dissolved dioxygen reduction [26]. Note that the latter is under mixed charged transfer and mass transport control [27].…”

Section: Flow Corrosion Ratementioning

confidence: 99%

Role of the Jet Angle, Particle Size, and Particle Concentration in the Degradation Behavior of Carbon Steel under Slow Slurry Erosion-Corrosion Conditions

Rasse

Mary

Abe

et al. 2021

Metals

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Erosion-corrosion behavior of piping systems is a critical issue for their durability. This work concerns the erosion-corrosion behavior of carbon steel as a function of abradant characteristics as particle size and concentration. Degradation tests were performed in a jet erosion-corrosion cell with a maximum flow rate of 4.8 m/s, and jet angles comprised 30° and 90°. Abradant particles consisted of angular alumina powder with a mean diameter of 181, 219, and 359 µm. A critical threshold flow velocity of about 2.5 m/s was determined when experiments were performed with particles with diameters of 181 µm and jet angles of 45°. Even if erosion did not occur, the degradation rate increased compared with the stagnant condition because of dissolved dioxygen supply. A maximum of erosion-corrosion of 4 mg × cm−2 × h−1 was determined for the jet angle of 45°, irrespective of the particle sizes. The increase of abradant concentration led to a higher degradation rate regardless of the jet angle. However, the degradation rates tended to limit values of 7 mg × cm−2 × h−1 at 45° and 5 mg × cm−2 × h−1 at 90°. Above a critical concentration, a slowdown of the degradation was measured, suggesting that particle behavior in dense fluid acts on material degradation. This critical concentration can be understood from the interactions of the particles in concentrated media that modify trajectories in the flow and at the metal surface, reducing their kinetic energy consequently.

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Effect of dissolved oxygen, temperature, and pH on polarization behavior of carbon steel in simulated concrete pore solution

Cited by 24 publications

References 60 publications

Modeling of electrochemical oxide film growth-a PDM refinement

Modeling of electrochemical oxide film growth-a PDM refinement

Improved Tafel-Based Potentiostatic Approach for Corrosion Rate Monitoring of Reinforcing Steel

Role of the Jet Angle, Particle Size, and Particle Concentration in the Degradation Behavior of Carbon Steel under Slow Slurry Erosion-Corrosion Conditions

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