Synergistic corrosion protection for galvanized steel by phosphating and sodium silicate post-sealing

Lin, Bilan; J, Lu; Kong, Gang

doi:10.1016/j.surfcoat.2007.08.001

Cited by 88 publications

(35 citation statements)

References 20 publications

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“…Additionally, in a chloride environment, corrosion products such as zinc hydroxychlorides are formed on the surface of zinc. 67 The LF capacitive loop [67][68][69] can be also attributed to the diffusion of the electrolyte in the pores of the coatings and the dissolution of the zinc layer. For samples coated with U(230) and U(400), no inductive loops in the LF region were found.…”

Section: Resultsmentioning

confidence: 99%

Ureasilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Chloride-Contaminated Simulated Concrete Pore Solution

Figueira

Silva

Pereira

2015

J. Electrochem. Soc.

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Organic-inorganic hybrid (OIH) sol-gel coatings based on ureasilicates (U(X)) have promising properties for use as eco-friendly coatings on hot dip galvanized steel (HDGS) and may be considered potential substitutes for pre-treatment systems containing Cr(VI). These OIH coatings reduce corrosion activity during the initial stages of contact of the HDGS samples with highly alkaline environments (cementitious media) and allow the mitigation of harmful effects of an initial excessive reaction between cement pastes and the zinc layer. However, the behavior of HDGS coated with U(X) in the presence of chloride ions has never been reported. In this paper, the performance of HDGS coated with five different U(X) coatings was assessed by electrochemical measurements in chloride-contaminated simulated concrete pore solution (SCPS). U(X) sol-gel coatings were produced and deposited on HDGS by a dip coating method. The coatings performance was evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization curves measurements, macrocell current density and polarization resistance in contact with chloride-contaminated SCPS. The SEM/EDS analyses of the coatings before and after the tests were also performed. The results showed that the HDGS samples coated with the OIH coatings exhibited enhanced corrosion resistance to chloride ions when compared to uncoated galvanized steel. Corrosion of the reinforcing steel is one of the most important causes of degradation in reinforced concrete structures (RCS).1 The presence of chloride, carbonation of the concrete or the low quality of the concrete cover causes serious damage to RCS. The entrance of chloride ions through the concrete from marine environments or deicing salts can cause rupture of the passive layer, allowing the steel surface to act as a coupled anodic and cathodic reaction cell in which corrosion processes take place.1-3 Therefore, the presence of chlorides in concrete can seriously shorten the service life of RCS. 3,4The expanded volume of corrosion products deposited in the interface between the concrete and the steel imposes expansive stresses, leading to delamination, cracking or spalling and eventually to the collapse of the RCS. 1 Several methods to improve the corrosion resistance of RCS have been proposed. 1,[5][6][7] In the last few years, the use of hot-dip galvanized steel (HDGS) has been recognized as an effective measure to increase the service life of RCS. [8][9][10][11] The galvanized coating (zinc layer) acts as a physical barrier, hindering the contact of aggressive agents with the steel substrate and the zinc acts as a sacrificial anode protecting the steel against corrosion. In addition, the formed zinc corrosion products have a smaller volume than those produced from iron, thus reducing the corrosion-induced delamination, cracking or spalling of the concrete.8 Additionally, the galvanized steel reinforcement can withstand exposure to chloride ion concentrations several times higher than the chloride level that causes corrosion in ste...

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Section: Resultsmentioning

confidence: 99%

Ureasilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Chloride-Contaminated Simulated Concrete Pore Solution

Figueira

Silva

Pereira

2015

J. Electrochem. Soc.

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“…According to experts, silicate corrosion inhibitors are non-toxic and have been used many years in the industry. Moreover, silicate is a compound that has the ability to be adsorbed on the metal surface to form a thin layer of barrier on the metal surface and protects the metal from corroding [11].…”

Section: Introductionmentioning

confidence: 99%

Nano-Silicate from Paddy Waste as Natural Corrosion Inhibitor

Othman¹,

Awizar²,

Dasuki³

2017

Rice - Technology and Production

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The highly advance usage of an agricultural waste of rice husk ash (RHA) from Oryza sativa L. was developed by extracting the nanosilicate contained in RHA as a corrosion inhibitor for carbon steel in 0.5 M NaCl media. The corrosion measurement was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), surface analysis, and adsorption isotherm study. The extracted nanosilicate powder from RHA was analyzed using Fourier Transform Infrared Spectroscopy (FTIR) to identify the presence of functional groups (SiO 2 ), whereas X-ray diffraction (XRD) to identify the phase of silica from RHA. The particle size of nanosilicate was confirmed by transmission electron microscopy (TEM) and Zetasizer analysis, and the results show particle size of nanosilicate in the range of 5-10 nm. The maximum inhibition efficiency (IE%) is up to 88% in NaCl media. On the other hand, the inhibitor adsorption properties follow Temkin isotherm with mixed type of inhibition properties. Surface analysis on specimen that was treated with nanosilicate was smoother with fewer pits and pores than untreated specimen. In future perspectives, nanosilicate from RHA has a promising advantages and imminent applications for industries revolving with composites, biomedicine, and many more.

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“…All these disadvantages dramatically reduce the service time of the whole district heating system [6]. Many methods such as coating [7], phosphating [8], anodic or cathodic controls [9] and use of inhibitors [10] are adopted to minimize the corrosion problems. Among them only the use of inhibitors is convenient and economic [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Nano Analyses of Adsorbed Film onto Carbon Steel

Kasilingam¹,

Thangavelu²,

Palanivel³

2014

Port. Electrochim. Acta

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The inhibition performance of a non-oxidising surfactant, namely cetyl trimethyl ammonium bromide (CTAB), and its co-adsorption behaviour with zinc ion on carbon steel in well water was studied by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), weight loss, as well as atomic force microscopy (AFM) and scanning electron microscopy. Results indicated that the formulation acted as an anodic inhibitor. Adsorption of the used inhibitor led to a reduction in the double layer capacitance and an increase in the charge transfer resistance. A synergistic effect was also observed for the studied inhibitor with Zn 2+ in weight loss measurements and electrochemical studies.

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Synergistic corrosion protection for galvanized steel by phosphating and sodium silicate post-sealing

Cited by 88 publications

References 20 publications

Ureasilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Chloride-Contaminated Simulated Concrete Pore Solution

Ureasilicate Hybrid Coatings for Corrosion Protection of Galvanized Steel in Chloride-Contaminated Simulated Concrete Pore Solution

Nano-Silicate from Paddy Waste as Natural Corrosion Inhibitor

Nano Analyses of Adsorbed Film onto Carbon Steel

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