Role of L-arginine on the Formation and Breakdown of Passive Film onto the Steel Rebars Surface in Chloride Contaminated Concrete Pore Solution

2021 ◽  
pp. 116454
Author(s):  
Jitendra Kumar Singh ◽  
Hyun-Min Yang ◽  
Han-Seung Lee ◽  
Soumen Mandal ◽  
Fahid ASLAM ◽  
...  
Keyword(s):  
Passive Film ◽  
Pore Solution ◽  
Steel Rebars ◽  
Chloride Contaminated

Study of the semi-conductive behavior of the passive film on carbon steel in simulated concrete pore solution under stress

2015 ◽  
Vol 62 (6) ◽  
pp. 363-370 ◽  
Author(s):  
Yujie Zhang ◽  
Amir Poursaee
Keyword(s):  
Passive Film ◽  
Design Methodology ◽  
Pore Solution ◽  
Passive Layer ◽  
Chloride Ions ◽  
Content Type ◽  
Ring Model ◽  
Different Types ◽  
Different Levels ◽  
Chloride Contaminated

Purpose – This paper aims to clarify the semi-conductive behavior of the passive layer formed in concrete environment without and with presence of chloride ions under different loading conditions. Passivation and depassivation of steel play an essential role in the subsequent stages of the corrosion process. Due to the nature of passive films on metals, they show electrochemical properties of a semi-conductor. Design/methodology/approach – A C-ring model was proposed in this experiment to induce stress on the specimens. Specimens under different levels of compressive and tensile loadings were exposed to chloride-free and chloride-contaminated solutions and their semi-conductive behavior was investigated using Mott–Schottky technique. Findings – Irrespective of the type and magnitude of the applied load, the passive film on rebars in simulated concrete pore solution is a highly disordered n-type semi-conductor. In all specimens, the presence of chloride ions decreases the slope of the Mott-Schottky plots, the donor density and the space charge layer thickness, which leads to a thinner passive film. Results indicate that steel specimens immersed in chloride-free pore solution under tensile loadings passivate more rapidly compared to those under compressive loadings. However, the situation in chloride-contaminated solution is different, and steel under tensile stress exhibits more corrosion than steel under compressive stress or under no load. Originality/value – Reinforced concrete structures inevitably experience variable mechanical loads, and continuous degradation from aggressive environments. Therefore, it is imperative to study the synergic impact of different types of mechanical loadings and exposure to chloride ions on this process. This paper fulfils this need.

Corrosion mitigation of steel rebars in chloride contaminated concrete pore solution using inhibitor: An electrochemical investigation

2018 ◽  
Vol 173 ◽  
pp. 443-451 ◽  
Author(s):  
Han-Seung Lee ◽  
Hyun-Min Yang ◽  
Jitendra Kumar Singh ◽  
Shailesh Kumar Prasad ◽  
Bongyoung Yoo
Keyword(s):  
Pore Solution ◽  
Electrochemical Investigation ◽  
Steel Rebars ◽  
Chloride Contaminated

The controlling role of new imidazole-based ionic liquids on the corrosion rate of steel rebars in the cement pore solution

2021 ◽  
Vol 329 ◽  
pp. 115442
Author(s):  
M.M. Barakat ◽  
M.A. Deyab ◽  
M.I. Nessim ◽  
S.S. Abd El-Rehim ◽  
Q. Mohsen
Keyword(s):  
Ionic Liquids ◽  
Corrosion Rate ◽  
Pore Solution ◽  
Steel Rebars

scholarly journals An 18-Month Analysis of Bond Strength of Hot-Dip Galvanized Reinforcing Steel B500SP and S235JR+AR to Chloride Contaminated Concrete

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 747
Author(s):  
Mariusz Jaśniok ◽  
Jacek Kołodziej ◽  
Krzysztof Gromysz
Keyword(s):  
Comparative Analysis ◽  
Bond Strength ◽  
Complex Geometry ◽  
Zinc Coating ◽  
3D Scanning ◽  
Steel Grade ◽  
Electrochemical Tests ◽  
Test Elements ◽  
Steel Rebars ◽  
Chloride Contaminated

This article describes the comparative analysis of tests on bond strength of hot-dip galvanized and black steel to concrete with and without chlorides. The bond effect was evaluated with six research methods: strength, electrochemical (measurements of potential, EIS and LPR), optical, and 3D scanning. The tests were conducted within a long period of 18 months on 48 test elements reinforced with smooth rebars ϕ8 mm from steel grade S235JR+AR and ribbed rebars ϕ8 mm and ϕ16 mm from steel grade B500SP. The main strength tests on the reinforcement bond to concrete were used to compare forces pulling out galvanized and black steel rebars from concrete. This comparative analysis was performed after 28, 180, and 540 days from the preparation of the elements. The electrochemical tests were performed to evaluate corrosion of steel rebars in concrete, particularly in chloride contaminated concrete. The behaviour of concrete elements while pulling out the rebar was observed using the system of digital cameras during the optical tests. As regards 3D scanning of ribbed rebars ϕ8 mm and ϕ16 mm, this method allowed the detailed identification of their complex geometry in terms of determining the polarization area to evaluate the corrosion rate of reinforcement in concrete. The test results indicated that the presence of zinc coating on rebars had an impact on the parameters of anchorage. In the case of ribbed rebars of 16 mm in diameter, the maximum values of adhesive stress and bond stiffness were reduced over time when compared to black steel rebars. Moreover, it was noticed that the stiffness of rebar anchorage in chloride contaminated concrete was considerably higher than in concrete without chlorides.

Experimental Study on the Interaction Effect of Sulfate Ions and Chloride Ions on Reinforcement Corrosion in Marine Environment

2017 ◽  
Author(s):  
Yi Huang ◽  
Yunze Xu ◽  
Xiaona Wang ◽  
Shide Song ◽  
Lujia Yang
Keyword(s):  
Passive Film ◽  
Pore Solution ◽  
Construction Materials ◽  
Chloride Ions ◽  
Localized Corrosion ◽  
Test Results ◽  
Reinforcement Corrosion ◽  
Marine Structures ◽  
Sulfate Ions ◽  
Corrosion Risk

Reinforced concrete is one of the most widely used construction materials for marine structures. Due to the abundance of the aggressive ions such as chloride ions and sulfate ions in the seawater, the reinforcement exposed to the marine and costal environment are exposed to a high corrosion risk. Localized corrosion will occur once the passive film on the rebar is damaged. In this work, the corrosion behavior of the steel in the simulated pore solution containing with both sulfate ions and chloride ions are studied by using cyclic potentialdynamic polarization methods and the corrosion morphologies observed using scanning electron microscope (SEM). The test results show that the initial rebar corrosion is caused by the absorption of the chloride ions in the passive film. The sulfate ions nearly had no effect on the corrosion of the rebar in pore solution and it can further mitigate the pitting corrosion in chloride containing pore solution.

Corrosion Protection of Construction Steel

2020 ◽  
pp. 327-347
Author(s):  
Arkadeb Mukhopadhyay ◽  
Sarmila Sahoo
Keyword(s):  
Carbon Dioxide ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Passive Film ◽  
Surface Engineering ◽  
Protective Coatings ◽  
Threshold Value ◽  
Construction Steel ◽  
Steel Rebars ◽  
Selection Of

Reinforced concrete is one of the most versatile materials for construction. In spite of this, the performance is limited by corrosion, cracking, and spalling of the steel rebars. The steel embedded in the concrete is protected by a passive film from the corrosive attack of chlorides, carbon dioxide, and sulphates. As the concentration of chlorides, carbon dioxide, or sulphates increases above a certain threshold value at the concrete rebar interface, the passive film breaks and leads to a severe increase in the corrosion rate. Further, dynamic loading and the temperature of the surroundings also affect the durability of the reinforcements. The rebar may be protected from such a corrosion attack by the suitable selection of material, improving the concrete quality and tailoring its composition or application of protective coatings. The present chapter highlights and summarizes the different grades of steel for their high corrosion resistance. Further, surface engineering and application of corrosion resistance coatings for the prevention of corrosion of construction steel rebars has been also discussed elaborately.

Effect of New Corrosion Inhibitor on Electrochemical Behavior of Prestressed Steel Wire in Simulated Concrete Pore Solution

2014 ◽  
Vol 941-944 ◽  
pp. 1390-1393
Author(s):  
Qi Lei Sun ◽  
Ze Rui Liu ◽  
Yun Zhu Guo ◽  
Feng Liu
Keyword(s):  
Corrosion Inhibitor ◽  
Passive Film ◽  
Corrosion Inhibitors ◽  
Pore Solution ◽  
Steel Wire ◽  
Chloride Ion ◽  
Ammonium Molybdate ◽  
Surface Coat ◽  
Protective Oxide ◽  
Protective Oxide Film

The polarization curve and AC impedance are used to study the impacts of new corrosion inhibitor on the prestressed steel wire electrochemistry action in the simulated concrete pore solution. The result shows that, the ammonium molybdate, DETA, propylene thiourea, 1,4-butynediol and other compound corrosion inhibitors are positive inhibitory corrosion inhibitors, with the components of passivator and healant of protective oxide film, which can contribute to the formation of a passive film of oxide on the rebar surface, repair the defects of rebar surface, coat the entire rebar with a passive film of oxide with good compactness and stability, prevent the chloride ion from penetration, reduce the free rate of iron ions, and thus achieve the anti-corrosion purpose.

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