Impact of curing on the corrosion performance of an eco-friendly silane sol–gel coating on 304L stainless steel

Rafiaei, Fahimeh; Naderi, Reza; Dehghanian, Changiz

doi:10.1039/c5ra04069h

Cited by 17 publications

(4 citation statements)

References 44 publications

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“…In contrast, ET6 coating not only protected the substrate well but also showed excellent stability in the medium that changes in the appearance could hardly be seen. The use of even very small amounts of the agent in the epoxy coating could significantly increase the cross-link density and thus helped blocking invasion of the corrosive medium [ 20 ]. However, when the content of the agent exceeds the optimum content, it would increase the water absorbability of the coating and reduce the stability and durability of the coating.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Resistance of Waterborne Epoxy Resin Coating Cross-Linked by Modified Tetrabutyl Titanate

Chen

Huang

et al. 2020

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The development of waterborne coating is essentially important for environmental protection, and cross-linking agent is of great significance for ensuring corrosion resistance of the coating. In this work, tetrabutyl titanate was modified by ethylene glycol and tris(2-hydroxyethyl) amine and used for the solidification of waterborne acrylic-epoxy resin. Fourier-transform infrared spectroscopy (FTIR) analysis revealed that the agent reacted with OH groups first to cross-link the resin preliminarily, and then, when the amount of agent was further increased, the amino groups opened epoxide rings resulting in a secondary cross-link. Field emission scanning electron microscope (FESEM) observation and electrochemical impedance spectroscopy (EIS) test found that, when the cross-linking agent was used at 6%, the coating remains intact and kept an impedance of as high as 108Ωcm2 even after being immersed in NaCl solution for 30 days. Copper-accelerated acetic acid-salt spray (CASS) test confirmed that the coating containing 6% cross-linking agent provided the best protection for the carbon steel substrate.

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Section: Resultsmentioning

confidence: 99%

Corrosion Resistance of Waterborne Epoxy Resin Coating Cross-Linked by Modified Tetrabutyl Titanate

Chen

Huang

et al. 2020

Scanning

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“…The curing temperature and duration have a significant effect on the properties of sol-gel coatings [43]. Curing conditions will affect the rate and extent of crosslinking that occurs in sol-gel coatings.…”

Section: Effect Of Curingmentioning

confidence: 99%

Processing and Weathering of Sol-Gel Clearcoats for Coil-Coated Steel

Watkins,

Griffiths,

Batchelor

et al. 2023

Coatings

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Clearcoats provide long-term aesthetics and protection for underlying coating systems, increasing product lifetimes. However, organic clearcoats are predominantly produced using fossil-fuel feedstocks. In search of a sustainable alternative, an experimental investigation was conducted on the development of glass-like clearcoats produced using the sol-gel process. The processing of sol-gel clearcoats over a pigmented polyurethane coating was studied by modifying the sol-gel solution pH, ageing, curing, precursor chemistry and deposition techniques. Under optimal formulation and processing conditions, defect-free sol-gel clearcoats were produced that have the potential to be scaled up to a coil-coating line using existing technologies. Mechanical testing demonstrated the coatings had excellent adhesion, hardness, and flexibility. Furthermore, accelerated laboratory weathering tests revealed the sol-gel coatings had superior degradation resistance compared to the organic coatings tested, resulting in negligible colour changes and higher gloss retention after 4000 h of exposure. The durability and environmental benefits of sol-gel clearcoats highlight their potential as a replacement for traditional organic clearcoats in a variety of applications.

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“…Through taking advantage of electrochemical noise method as a non-intrusive technique, useful kinetic and mechanistic information on the protective performance of various coatings could be provided (Homborg et al , 2013; Naderi and Attar, 2009a, 2009b, 2009c). Recently, an increasing interest toward applying the technique has been found among corrosion researchers to investigate the protection of silane coatings (Asadi et al , 2014a, 2014b, 2014c; Ansari et al , 2015; Rafiaei et al , 2015). Asadi et al (2014a, 2014b, 2014c) used electrochemical noise along with common electrochemical techniques, i.e.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical noise assessment of effect of sol parameters on the performance of an eco-friendly silane sol-gel coating on 304L stainless steel

Ansari

Naderi

Rafiaei

2018

PRT

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Propose This paper aims to access the protective function of hybrid sol-gel coatings deposited on 304L stainless steel substrate in silane solutions containing a mixture of tetraethoxysilane, methyltriethoxysilane and glycidyloxypropyltrimethoxysilane with different pH values during various immersion periods. Design/methodology/approach The 304L stainless steels coated through 10 and 30 s of immersion in the silane solutions with pH values of 2.1 and 2.8 were exposed to NaCl solution. The corrosion resistance of the coated substrates was studied through taking advantage of electrochemical noise method as well as atomic force microscopy (AFM), water contact angle and field emission-type scanning electron microscopy (FESEM) surface analysis. Findings The electrochemical current noise, PSD (I) plot, noise resistance and characteristic charge as parameters extracted from electrochemical noise method indicated the superiority of eco-friendly silane coating deposited on the substrate surface during 10 s exposure to the solution, due to the film uniformity and homogeneity as confirmed by FESEM and AFM. Moreover, immersion of the stainless steel in the silane solution with pH 2.1, characterized by higher hydrolysis ratio, led to more effective corrosion control in the NaCl electrolyte according to the results of electrochemical noise and FTIR measurements. Research limitations/implications The noise resistance and characteristic charge as electrochemical noise parameters were only used in this research to evaluate the protective behavior of the water-based silane sol-gel coatings. Future studies should examine the correlation between electrochemical noise data and the parameters extracted from other electrochemical methods, e.g. electrochemical impedance spectroscopy. Practical implications The data obtained in this research may provide an effective approach based on electrochemical noise method to screen the silane sol-gel coatings for protection of metallic substrates against corrosion. Originality/value According to the literature, no report can be found studying the effect of immersion time on a silane solution, including glycidyloxypropyltrimethoxysilane, tetraethoxysilane and methyltriethoxysilane, as well as the silane solution pH on the corrosion resistance of 304L stainless steel in NaCl solution through electrochemical noise method.

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Impact of curing on the corrosion performance of an eco-friendly silane sol–gel coating on 304L stainless steel

Cited by 17 publications

References 44 publications

Corrosion Resistance of Waterborne Epoxy Resin Coating Cross-Linked by Modified Tetrabutyl Titanate

Corrosion Resistance of Waterborne Epoxy Resin Coating Cross-Linked by Modified Tetrabutyl Titanate

Processing and Weathering of Sol-Gel Clearcoats for Coil-Coated Steel

Electrochemical noise assessment of effect of sol parameters on the performance of an eco-friendly silane sol-gel coating on 304L stainless steel

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