New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

Kunst, Sandra Raquel; Cardoso, Henrique Ribeiro Piaggio; Beltrami, Lílian Vanessa Rossa; Oliveira, Cláudia Trindade; Menezes, Tiago Lemos; Ferreira, Jane Zoppas; Malfatti, Célia de Fraga

doi:10.1590/1516-1439.288914

Cited by 13 publications

(14 citation statements)

References 41 publications

(47 reference statements)

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“…Data was collected (for a duration of 1 h) at times of 1 h, 24 h and 48 h of exposure. All coated samples show a corrosion potential substantially higher than the bare steel (Q-panel), suggesting that these coatings have a barrier effect, in agreement with trends observed by other researchers [36,37].…”

Section: Corrosion Performancesupporting

confidence: 91%

Influence of silica nanoparticles on corrosion resistance of sol-gel based coatings on mild steel

Mora

Naik

Paul

et al. 2017

Surface and Coatings Technology

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Abstract:For this study, unfunctionalised and functionalised nanoparticles of silica (SiO2) were incorporated into a sol-gel based matrix in an effort to provide more effective corrosion protection on a mild steel substrate. Tests such as atomic force microscopy (AFM) and white light interferometry (WLI) were carried out to characterise coating microstructure and properties. Corrosion protection and coating durability was investigated using differe nt methods which included electrochemical impedance spectroscopy (EIS) and accelerated salt spray testing to simulate a marine environment. Electrochemical test results as well as results after exposure in the neutral salt spray test indicated that the addition of silica nanoparticles led to an improvement in corrosion resistance of the coating matrix. The most effective performance was observed when the nanoparticles were functiona lised. Nanoparticle functionalisation helped to avoid agglomeration during incorporation leading to a more unifo r m nanoparticle distribution within the coating formulation and an improvement of the coating's ability to protect against corrosion.2 Highlights:-The influence of silica (SiO2) nanoparticle incorporation in a sol-gel based coating was studied -SiO2 particle surface treatment improved coating homogeneity and prevented cracking propagation -Corrosion resistance improved with functionalised SiO2 nanoparticles

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Section: Corrosion Performancesupporting

confidence: 91%

Influence of silica nanoparticles on corrosion resistance of sol-gel based coatings on mild steel

Mora

Naik

Paul

et al. 2017

Surface and Coatings Technology

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“…Crosslinking and branching of these groups give rise to the formation of a dense network, which enhanced barrier properties due to the limitation of electrolyte access to the underlying metal or alloy [18]. Similar conclusions were reported by Kunst, et al [19] where thermal curing at 90 • C for 20 min was sufficient to lead to the formation of a film with a regular, homogenous and compact structure and great flexibility. This film was obtained from a sol that consisted of two alkoxide precursors, MPTS and TEOS, with nitrate cerium and polyethylene glycol plasticizers (20 g•L −1 ) and was subsequently deposited over galvanized steel, providing the best anticorrosive properties.…”

Section: Introductionsupporting

confidence: 80%

Polysiloxane Hybrids via Sol-Gel Process: Effect of Temperature on Network Formation

2020

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The effect of temperature on the network formation of polysiloxane hybrids was evaluated since this type of material is currently in high demand. In the last decades, the deposition of these coatings on different substrates, mostly metals, has demonstrated anticorrosion properties. Sol-gel hybrids were prepared by mixing 3-methacryloxypropyltrimethoxysilane (MPTS) and tetramethyl orthosilicate (TMOS) with a molar ratio of 1. The formation, thickness and composition of these hybrid materials were evaluated by nuclear magnetic resonance (NMR) spectroscopy and scanning electron microscopy (SEM), respectively. The results showed that the temperature plays an important role in the network formation, the total condensation degree and the total dimensionality of the hybrid materials. At room temperature, the polysiloxane hybrids presented total condensation degrees lower than 75% and a total dimensionality (dtotal) = 2.5, while those obtained at 65 °C presented total condensation degrees higher than 80% and a dtotal = 2.8. The ideal conditions to prepare polysiloxane hybrids are 65 °C for 4 h, where this shows a higher atomic percentage of Si and a greater thickness.

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“…The tetraethoxysilane (TEOS) is a commonly silane used to form films that protect the metal of the corrosive attack. According to several authors 10,[12][13][14][15][16][17] the TEOS based hybrids film forms an homogeneous, compact and resistant physical barrier. These hybrid films protect and assure the integrity of metal substrates in corrosive media.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tetraethoxy-silane (TEOS) Amounts on the Corrosion Prevention Properties of Siloxane-PMMA Hybrid Coatings on Galvanized Steel Substrates

et al. 2015

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Siloxane-poly(methyl methacrylate) (PMMA) organic-inorganic hybrid coatings were deposited on galvanized steel by the dip-coating sol-gel technique. Anticorrosion properties, as well as the morphological, surface and structural features were studied. Hybrid coatings were synthesized from tetraethoxy-silane (TEOS) and methyl methacrylate (MMA) as inorganic and organic phases, respectively, linked by 3-metacriloxypropyl-trimethoxysilane (TMSM) as a coupling agent. The MMA/TMSM ratio was kept constant, whereas the four TEOS/TMSM ratios were varied. The characterization of coatings was assessed using several techniques such as Scanning Electronic Microscopy (SEM), Contact Angle, Fourier Transform Infrared (FT-IR), Open Circuit Polarization (OCP), Atomic Force Microscopy (AFM) and Electrochemical Impedance Spectroscopy measurements (EIS). The EIS results, which were obtained for the hybrid coatings, were discussed based on an electrical equivalent circuit used to adjust the experimental data. The results showed that the increasing the TEOS content caused increase in coating thickness, increased in the surface roughness and increased in the surface hydrophobicity. The film with the highest TEOS content presented the best electrochemical performance, more effective in protecting against corrosion.

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New Sol-gel Formulations to Increase the Barrier Effect of a Protective Coating Against the Corrosion and Wear of Galvanized Steel

Cited by 13 publications

References 41 publications

Influence of silica nanoparticles on corrosion resistance of sol-gel based coatings on mild steel

Influence of silica nanoparticles on corrosion resistance of sol-gel based coatings on mild steel

Polysiloxane Hybrids via Sol-Gel Process: Effect of Temperature on Network Formation

Effect of Tetraethoxy-silane (TEOS) Amounts on the Corrosion Prevention Properties of Siloxane-PMMA Hybrid Coatings on Galvanized Steel Substrates

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