Electrochemical study on semiconductive properties of the passive film on rebar in concrete

Yun-lian, Zhang; Li, Qiling

doi:10.1631/jzus.2006.a1447

Cited by 24 publications

(8 citation statements)

References 21 publications

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“…If the capacitance data are measured while sweeping the potential in the negative direction from the formation voltage at a sufficiently high sweep rate, the layer thickness remains constant and the capacity change reflects changes in the double layer, on both, semiconductor and solution sides. The short linear Mott‐Schottky region observed in the present study reflects gradual depletion of the shallow donor levels . The break potential of the Mott‐Schottky straight line which lays between ‐0.2 and ‐0.3 V SCE corresponds to that observed by Zhang et al for Q235 rebar steel in saturated Ca(OH) 2 .…”

Section: Resultssupporting

confidence: 87%

“…The short linear Mott‐Schottky region observed in the present study reflects gradual depletion of the shallow donor levels . The break potential of the Mott‐Schottky straight line which lays between ‐0.2 and ‐0.3 V SCE corresponds to that observed by Zhang et al for Q235 rebar steel in saturated Ca(OH) 2 .…”

Section: Resultssupporting

confidence: 87%

“…The n‐type character of the oxide film implies that the predominant donors in the passive film can be either oxygen vacancies or iron(II) ions . Two linear Mott‐Schottky ranges were previously observed on rebar steel in saturated calcium hydroxide and ascribed to the two iron(II) donor levels. It is known that the inner Fe 3 O 4 is very thin (< 1 nm) and has nearly a metallic conductivity while the n‐type semiconducting behaviour mainly originates from the thicker outer γ‐Fe 2 O 3 layer.…”

Section: Resultsmentioning

confidence: 91%

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Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

Žulj

Serdar

Martinez

2015

Materials & Corrosion

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This paper presents results of the basic study on the inhibitive action of tartrate toward chloride‐induced corrosion on carbon steel rebar in alkaline environment. Modification of the electrochemical behaviour and semiconductive properties of passive film formed on steel surface in the presence of tartrate were characterised by a range of electrochemical techniques in saturated calcium hydroxide. In the presence of tartrate in saturated calcium hydroxide with addition of 0.14 M sodium chloride pitting corrosion initiation was postponed for 622 mV up to potentials of oxygen evolution reaction. The hypothesis on the competitive adsorption between the chloride ions and tartrate anion through the surface complex formation was applied on the studied system.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 91%

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Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

Žulj

Serdar

Martinez

2015

Materials & Corrosion

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“…This passivity is obtained through a thin semicondutive layer of oxides that surround the reinforcement, protecting it physically and chemically [5]. This protection is popularly known as a passivation film.…”

Section: David Publishingmentioning

confidence: 99%

Evaluation and Repair of a Reinforced Concrete Structure: A Case Study

Oliveira¹,

Oliveira²

2018

JESE-B

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Reinforced concrete structure durability has been getting a lot of attention in academic research related to building security and stability. Thus, knowledge about the condition of the structures, particularly those affected by issue symptoms, is a powerful tool to minimize costs and improve structural reinforcement and repair service efficiency. Steel corrosion in reinforced concrete frames is the most frequent pathological manifestation in buildings around the world, and it is closely linked to the concept of structural integrity and safety. This paper describes, explains and remarks on the services performed by a company specialized in structure pathology in determining the causes, origins and mechanisms involved in steel corrosion in reinforced concrete frames in the ground and mezzanine floors of a building located in the coastal city of Cabedelo/PB. Mechanical, physical, chemical and electrochemical tests were conducted in the structure, and the conclusion was that concrete carbonation was the mechanism behind the pathological manifestation, and the source of the issue was linked to the execution of the work. The therapy process adopted was divided into levels related to the degree and progress in the observed degradation, and a few structural repair techniques were adopted, such as traditional structure repair, chemical realkalinization, corrosion inhibition and surface protection.

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“…Buildings and many infrastructural developments, globally, depend on the use of steel reinforced concrete materials because of its durability and relative cost effectiveness compared to other materials (Al-Amoudi et al 2003;Zhao et al 2010;Shi et al 2012;Tang et al 2012). However, corrosion degradation of concrete steel rebar, in aggressive environments, affect these properties by inducing low structural strength, cost intensive repairs, rehabilitation and maintenance and, if the corrosion remains unchecked, ultimate premature failure of the concrete structure (Zhang & Li 2006;Duffó et al 2009;Junzhi et al 2010;Sharifi & Rahgozar 2010;Zhao et al 2010;Dong et al 2011;Zhao et al 2011;Huang et al 2012;Omotosho et al 2012). Several methods have been proposed for tackling corrosion problems of reinforcing steel in concrete.…”

Section: Introductionmentioning

confidence: 99%

Probability density fittings of corrosion test-data: Implications on C6H15NO3 effectiveness on concrete steel-rebar corrosion

Okeniyi

Ambrose

Okpala

et al. 2014

Sadhana

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In this study, corrosion test-data of steel-rebar in concrete were subjected to the fittings of the Normal, Gumbel and the Weibull probability distribution functions. This was done to investigate the suitability of the results of the fitted test-data, by these distributions, for modelling the effectiveness of C 6 H 15 NO 3 , triethanolamine (TEA), admixtures on the corrosion of steel-rebar in concrete in NaCl and in H 2 SO 4 test-media. For this, six different concentrations of TEA were admixed in replicates of steel-reinforced concrete samples which were immersed in the saline/marine and the microbial/industrial simulating test-environments for seventy-five days. From these, distribution fittings of the non-destructive electrochemical measurements were subjected to the Kolmogorov-Smirnov goodness-of-fit statistics and to the analyses of variance modelling for studying test-data compatibility to the fittings and testing significance. Although all fittings of test-data followed similar trends of significant testing, the fittings of the corrosion rate test data followed the Weibull more than the Normal and the Gumbel distribution fittings, thus supporting use of the Weibull fittings for modelling effectiveness. The effectiveness models on rebar corrosion, based on these, identified 0.083% TEA with optimal inhibition efficiency, η = 72.17± 10.68%, in NaCl medium while 0.667% TEA was the only admixture with positive * For correspondence Joshua Olusegun Okeniyi et al effectiveness, η = 56.45±15.85%, in H 2 SO 4 medium. These results bear implications on the concentrations of TEA for effective corrosion protection of concrete steel-rebar in saline/marine and in industrial/microbial environments.

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Electrochemical study on semiconductive properties of the passive film on rebar in concrete

Cited by 24 publications

References 21 publications

Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

Evaluation and Repair of a Reinforced Concrete Structure: A Case Study

Probability density fittings of corrosion test-data: Implications on C6H15NO3 effectiveness on concrete steel-rebar corrosion

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