Influence of Hot-dip Galvanizing of Reinforcement on the Kinetics and Thermodynamics of Corrosion Process in Concrete

Hegyi, Andreea; Dico, Carmen; Constantinescu, Horia; Baeră, Cornelia

doi:10.1016/j.proeng.2017.02.380

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…However, on this film of crystals, with an extended time, in the presence of chlorides, simonkolleite (Zn 5 (OH) 8 Cl 2 • H 2 O) and zincite (ZnO) eventually grow and become detectable, and this fact has been documented in the literature by long-term laboratory tests of specimens of zinc and galvanized steel after the pitting corrosion occurred (Belaid et al, 2000;Tittarelli and Bellezze, 2010;Zheng et al, 2018a;Román et al, 2014). In addition, in the long term, when there is no presence of chlorides, wulfingite (Zn(OH) 2 ) and zincite (ZnO) have been identified (Hegyi et al, 2017;Pokorný et al, 2017;Pokorný et al, 2019).…”

Section: Surface Analysismentioning

confidence: 99%

Effect of a Fast Potential Change on the Early Stage of Zinc Passivation in a Saturated Calcium Hydroxide Solution

Garnica-Rodríguez

Montoya²,

Rodríguez-Gomez

et al. 2022

Front. Mater.

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The fast and sharp corrosion potential change from the active state to the passive state, that pure zinc plates immersed in calcium hydroxide saturated solutions with and without chlorides spontaneously exhibit at the early stage of passivation, was studied. The corrosion behavior was investigated by corrosion potential monitoring, anodic polarization curves and electrochemical impedance spectroscopy. The zinc surface was characterized by scanning electron microscopy and X-ray energy dispersive spectroscopy. Experimental results show that the presence of chlorides increases the rate of change of potential by 10-fold in the early stage of passivation, producing a porous passivating film of corrosion products mainly made of calcium hydroxy-zincate Ca(Zn(OH)3)2· 2 H2O, with a less protective barrier effect than the non-porous film formed without chlorides. On the other hand, a modeling approach was achieved by solving the transient 2D Nernst–Planck equations and considering 12 chemical species. Numerical results confirm that the composition of the chemical products generated on the Zn surface certainly depends on the concentration of Cl¯ ions: Simonkolleite and hidroxides become unstable in the presence of high Cl¯ concentrations, whereas calcium hydroxyl-zincate is the main chemical compound generated on the Zn surface. However, the presence of the latter compound is much more important in electrolytes with very low concentration of Cl¯ ions.

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Section: Surface Analysismentioning

confidence: 99%

Effect of a Fast Potential Change on the Early Stage of Zinc Passivation in a Saturated Calcium Hydroxide Solution

Garnica-Rodríguez

Montoya²,

Rodríguez-Gomez

et al. 2022

Front. Mater.

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“…Hot-dip galvanized reinforcement dramatically diminishes the problem of steel corrosion and concrete spalling. Thus it provides a cost-effective and robust impact on the toughness of the concrete [85].…”

Section: Corrosion Inhibition Studies Of Galvanized Steelmentioning

confidence: 99%

An Up-to-Date Review on Industrially Significant Inhibitors for Corrosion Control of Zinc

Pais

Rao

2021

J Bio Tribo Corros

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Zinc, an important nonferrous metal, is the fourth most used metal in the world. It has innumerable uses in industrial as well as in other segments. The primary utility of zinc is in galvanization and as an anode in the battery. Steel coated with zinc, which is known as galvanized steel, is widely used in industries. Even though zinc protects many metals from undergoing corrosion, by itself, it undergoes corrosion in several acidic, alkaline, and neutral environments. The corrosion behavior of zinc is significant in all industries where it is utilized either directly or indirectly in the form of a sacrificial coating. In-depth analysis of the reported literature indicated that corrosion attenuation of zinc in acidic and alkaline medium was studied by many researchers, and various classes of inhibitors were tried under varying experimental conditions. Most inhibitors can be amalgamated as excellent inhibitors with an inhibition efficiency of 80–90%. Even though this is a subject of intense research, systematic documentation on the same is not available in the literature. This review consolidates research work on corrosion and inhibition studies of zinc and galvanized steel over a period of three decades.

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“…The galvanizing method is a widely accepted industry practice to protect steel substrate from corrosion [11]. The addition of alloying elements tends to increase the corrosion resistance of copper and nickel-based superalloys [12,13].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition Based Preparation of Zn–Ni Alloy and Zn–Ni–WC Nano-Composite Coatings for Corrosion-Resistant Applications

et al. 2021

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Zinc (Zn) is one of the five most widely consumed metals in the world. Indeed, more than 50% of all the zinc produced is used in zinc-galvanizing processes to protect steel from corrosion. Zn-based coatings have the potential for use as a corrosion-resistant barrier, but their wider use is restricted due to the poor mechanical properties of Zn that are needed to protect steel and other metals from rusting. The addition of other alloying elements such as Ni (Nickle) and WC (Tungsten Carbide) to Zn coating can improve its performance. This study investigates, the corrosion performance of Zn–Ni coating and Zn–Ni–WC composite nanocoatings fabricated on mild steel substrate in an environmentally friendly bath solution. The influence of WC nanoparticles on Zn–Ni deposition was also investigated. The surface morphologies, texture coefficients via XRD (X-ray diffraction), SEM (Scanning Electron Microscopy), and EDS (Energy-dispersive X-ray spectroscopy) were analyzed. The electrochemical test such as polarization curves (PC) and electrochemical impedance spectroscopy (EIS) resulted in a corrosion rate of 0.6948 Å/min for Zn–Ni–WC composite nanocoating, and 1.192 Å/min for Zn–Ni coating. The results showed that the Zn–Ni–WC composite nanocoating reduced the corrosion rate by 41.71% and showed an 8.56% increase in microhardness compared to the hardness of the Zn–Ni coating. These results are augmented to better wettable characteristics of zinc, which developed good interfacial metallurgical adhesion amongst the Ni and WC elements. The results of the novel Zn–Ni–WC nanocomposite coatings achieved a great improvement of mechanical property and corrosion protection to the steel substrate surface.

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Influence of Hot-dip Galvanizing of Reinforcement on the Kinetics and Thermodynamics of Corrosion Process in Concrete

Cited by 7 publications

References 12 publications

Effect of a Fast Potential Change on the Early Stage of Zinc Passivation in a Saturated Calcium Hydroxide Solution

Effect of a Fast Potential Change on the Early Stage of Zinc Passivation in a Saturated Calcium Hydroxide Solution

An Up-to-Date Review on Industrially Significant Inhibitors for Corrosion Control of Zinc

Electrodeposition Based Preparation of Zn–Ni Alloy and Zn–Ni–WC Nano-Composite Coatings for Corrosion-Resistant Applications

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