Effects of stray current and silicate ions on electrochemical behavior of a high-strength prestressing steel in simulated concrete pore solutions

Ming, Jing; Zhou, Xiaocheng; Zuo, Haining; Jiang, Linhua; Zou, Yiqing; Shi, Jinjie

doi:10.1016/j.corsci.2022.110083

Cited by 44 publications

(5 citation statements)

References 86 publications

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“…Therefore, accurate calculation requires almost all the resistance parameters in Figure 2. However, in reality, these parameters, especially the resistance parameters, are difficult to accurately test online [26][27][28][29]. Therefore, it is necessary to simplify the model.…”

Section: Railmentioning

confidence: 99%

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Tang¹,

Li²,

Xiao

et al. 2023

IEEE Access

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During the operation of the urban subway, there will be stray current leaking into the ground, which may invade the neutral point of the transformer along the line, causing the working magnetization curve of the transformer core to shift, thereby causing the direct-current (DC) bias effect of the transformer. Since there are unknown parameters in the equivalent circuit model of the stray current of the subway, in order to simplify the process of the influence of the subway operation on the neutral current, based on the analysis of the formation mechanism of stray current, a real subway line has been selected and a monitoring platform in the nearby high-voltage (HV) substation has been built to record the neutral current. Meanwhile, through the on-site recording of the entry and exit time of subway trains at four consecutive stations, the running trajectories of the subway trains can be reversed. According to the trajectory of the subway train, the recorded neutral current was re-divided into time periods, and the synergistic analysis of the neutral current and the train trajectory in the corresponding time period was carried out. The neutral current measurement results for 4 consecutive days indicate that the influence of the subway train on the neutral current of the substation is mainly the influence of the unbalanced load, and the degree of the unbalance mainly comes from the distance and the acceleration and braking of the subway train. The trajectory of the subway train is related to the amplitude of the neutral current. The closer the subway train is to the substation, the greater the impact on the neutral current.INDEX TERMS Neutral current, urban subway, DC bias, stray current.

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Section: Railmentioning

confidence: 99%

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Tang¹,

Li²,

Xiao

et al. 2023

IEEE Access

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“…The corrosion behavior will be influenced in the soil when the external electric field changes or a stray-current passes through. It is mainly because of the induced current when the power corridor is parallel to the oil and gas corridor (Ming et al , 2022) or the current leaked into the track bed and the surrounding soil medium when the subway train is running if using a DC power supply traction mode (Jin and Yu, 2021; Yu et al , 2022). As this kind of current passes through the metal conductor, a current loop is formed between the metal and the earth, making the current flow to the soil through the conductor.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric corrosion acceleration effect on commercial aluminum alloys in current-carrying condition

Gao,

Li,

et al. 2024

ACMM

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Purpose The purpose of this paper is to study the effect of current-carrying condition on the electrochemical process and atmospheric corrosion behavior of the commercial aluminum alloys. Design/methodology/approach Potentiodynamic polarization tests were performed to study the electrochemical process of the aluminum alloys. Salt spray tests and weight loss tests were carried out to study the atmospheric corrosion behavior. The corrosion morphology of the alloys was observed, and the products were analyzed. Findings The corrosion process of four aluminum alloys was accelerated in the current-carrying condition. Moreover, the acceleration effect on A2024 and A7075 was much stronger than that on A1050 and A5052. The main factors would be the differences in microstructure and corrosion resistance between these alloys. As the carried current increased, the corrosion rate and corrosion current density of the aluminum alloys gradually increased, with the protection of the corrosion product film decreasing linearly. Originality/value This is a recent study on the corrosion behavior of conductors under current-carrying condition, which truly understands the corrosion status of power grid materials. Relevant results provide support for the corrosion protection and safe service of aluminum alloy in power systems.

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“…The presence of such ions in concrete has also been reported to act as an autonomic self-healing agent 7 , alkali activator in alkali-activated cements 8 , setting accelerator and waterproofing agent in paints and coatings 9 , 10 , microstructure and strength enhancer for water-rich materials 11 , and strength booster for cured concrete 12 – 14 . Information regarding the direct role of silicate ions in metal corrosion is also available as many researchers have reported the inhibitory effects of silicate ions on steel corrosion in alkaline environments 15 – 24 . Synergistic combinations of two or more chemicals are developed for concrete to get improved inhibition against corrosion and pitting of embedded rebars, enhanced mechanical properties of cast concrete, improved workability and reduce the cost.…”

Section: Introductionmentioning

confidence: 99%

Synergistic protection of borate and silicate salts composite for controlling the chloride-induced pitting and uniform corrosion of steel reinforcement bars embedded in mortars

Hussain,

Alhozaimy,

Al-Negheimish

et al. 2024

Sci Rep

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In this study, the efficacy of the combined effect of borate and silicate alkali metal salts added to mortars for controlling the chloride-induced uniform and localized corrosion of embedded steel rebars is examined. The individually added salts in mortars are found to have insignificant effects in terms of reducing the uniform corrosion rate and localized damage. However, their combination (0.50% sodium tetra borate + 0.10% sodium silicate added with respect to the weight of the binder) provides complete protection to reinforcements tested for long durations under wet/dry treatments with mortars in saline water and laboratory atmospheres. Electrochemical impedance spectroscopy, direct current cyclic polarization, polarization resistance, and visual observations are used for quantitative and qualitative evaluations of the protective effects of the tested additives. X-ray diffraction analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy analysis of the corrosion products formed on the embedded steel surfaces help explain the possible mechanisms behind the considerable improvement in the inhibitive effects of a mixed composition of borate and silicate. This combination also improves the compressive strength and workability of the mixed concrete. The results reveal that the synergistic protection provided by a mixture of borate and silicate can be attributed to the co-deposition of an iron-boron + ferrosilicate + cortensitite (an iron-silicon phase) film on the rebar surface.

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Effects of stray current and silicate ions on electrochemical behavior of a high-strength prestressing steel in simulated concrete pore solutions

Cited by 44 publications

References 86 publications

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Atmospheric corrosion acceleration effect on commercial aluminum alloys in current-carrying condition

Synergistic protection of borate and silicate salts composite for controlling the chloride-induced pitting and uniform corrosion of steel reinforcement bars embedded in mortars

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