EIS study of effective capacitance and water uptake behaviors of silicone-epoxy hybrid coatings on mild steel

Yuan, Xiying; Yue, Zhufeng; Chen, X.; Wen, Shifeng; Li, L.; Feng, Tao

doi:10.1016/j.porgcoat.2015.04.004

Cited by 86 publications

(33 citation statements)

References 29 publications

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“…R CT and CPE CT were added and represent, respectively, the charge transfer resistance to the metal. As reported by several authors [38][39][40][41][42][43][44] , the charge transfer resistance is related to the process of electron transfer from one phase (electrode) to another (liquid).…”

Section: Effect Of Tetraethoxy-silane (Teos) Amounts On the Corrosionmentioning

confidence: 93%

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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Section: Effect Of Tetraethoxy-silane (Teos) Amounts On the Corrosionmentioning

confidence: 93%

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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“…Comparison of EIS parameters: (a) pore resistance of coating and (b) coating capacitance. Pore resistance and capacitance of coatings represent a degree of ability of coating to resist the penetration of electrolyte solution, which is closely related to the coating microstructures such as open pores, pin holes, and damage in the coating layer[47,48]. Enamel coating has the lowest average pore resistance (8.88 kΩ cm 2 ) and the highest average capacitance (26.4 µF/cm 2 ), while the duplex coating has the highest average pore resistance (6.80 GΩ cm 2 ) and the lowest average capacitance (20.6 pF/cm 2 ).…”

mentioning

confidence: 99%

Impact and corrosion resistances of duplex epoxy/enamel coated plates

Tang

Bao

Chen

et al. 2016

Construction and Building Materials

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The microstructure, impact resistance, pull-off adhesion strength, and corrosion resistances of duplex epoxy/enamel coating applied on steel plates are investigated experimentally. In comparison with those of individual epoxy and enamel coatings, the duplex coating has lower adhesion strength, higher impact resistance, higher short-term and long-term corrosion resistances both in 3.5 wt.% NaCl solution and saturated Ca(OH) 2 solution with various chloride concentrations. This is because the outer epoxy fills the micro pores in the inner enamel. Impact induced damage significantly reduces the corrosion resistances of epoxy and duplex coatings but has little effect on the corrosion resistance of enamel coating.

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“…The quantitative analysis of EIS data needs fitting with an accurate equivalent circuit model. Thus, an equivalent circuit with two-time constants was utilized to analyze the obtained EIS curves of the coated specimens [31]. The fitted equivalent circuit model denoted as R s (R ct Q 1 ) (R f Q 2 ) contains two combinations of resistors and capacitors with the solution resistance.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, its use minimizes error and provides more detailed information about the coating’s non-ideal dielectric properties. The CPE in the current work was calculated using the following equation [31]:Z = Y 0 −1 (jω) −n where ω is the angular frequency (2πf), Y is a proportionality factor, and n is the deviation parameter that is associated with the surface roughness. Here, n = 1 for an ideal capacitor where Q 1 = C dl .…”

Section: Resultsmentioning

confidence: 99%

Tribological and Electrochemical Characterization of UHMWPE Hybrid Nanocomposite Coating for Biomedical Applications

et al. 2019

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A new approach of using a polymer hybrid nanocomposite coating to modify the surface of titanium and its alloys is explored in this study. Electrostatic spray coating process is used to deposit the coating on the plasma-treated substrates for better adhesion. Ultra-high molecular weight polyethylene (UHMWPE) has been selected as the parent matrix for the coating due to its biocompatibility and excellent tribological properties. However, to improve its load-bearing capacity carbon nanotubes (CNT’s) (0.5, 1.5, and 3 wt.%) are used as reinforcement and to further enhance its performance, different weight percent of hydroxyapatite (HA) (0.5, 1.5, 3, and 5 wt.%) are introduced to form a hybrid nanocomposite coating. The dispersion of CNT’s and HA was evaluated by Raman spectroscopy and scanning electron microscopy. The electrochemical corrosion behavior of the nanocomposite coatings was evaluated by performing potentiodynamic polarization and electrochemical impedance spectroscopic tests in simulated body fluid. Tribological performance of the developed hybrid nanocomposite coating was evaluated using a 6.3 mm diameter stainless steel (440C) ball as the counterface in a ball-on-disk configuration. Tests were carried out at different normal loads (7 N, 9 N, 12 N, and 15 N) and a constant sliding velocity of 0.1 m/s. The developed hybrid nanocomposite coating showed excellent mechanical properties in terms of high hardness, improved scratch resistance, and excellent wear and corrosion resistance compared to the pristine UHMWPE coatings.

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EIS study of effective capacitance and water uptake behaviors of silicone-epoxy hybrid coatings on mild steel

Cited by 86 publications

References 29 publications

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

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

Impact and corrosion resistances of duplex epoxy/enamel coated plates

Tribological and Electrochemical Characterization of UHMWPE Hybrid Nanocomposite Coating for Biomedical Applications

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