scholarly journals Electrochemical Impedance Spectroscopy Study of Waterborne Epoxy Coating Film Formation

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 254 ◽  
Author(s):  
Končan Volmajervarna ◽  
Steinbücher ◽  
Berce ◽  
Venturini ◽  
Gaberšček
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Formation Process ◽  
Volume Concentration ◽  
Electrochemical Impedance ◽  
Film Formation ◽  
Coating Film ◽  
Epoxy Coatings ◽  
Pigment Volume Concentration ◽  
Corrosion Stability

The film formation process in waterborne (WB) epoxy coatings is studied using electrochemical impedance spectroscopy (EIS) measurements and dynamic mechanical analysis (DMA). Ten epoxy coatings with different pigment volume concentration were prepared on standard steel substrates and carefully monitored over four weeks (30 days). It is shown that impedance spectroscopy can serve as a very sensitive tool for accurate experimental detection of the critical pigment volume concentration. We also show that the optimal film formation process and corrosion stability of coatings are greatly affected by the coating pigment volume concentration (PVC) value. As a whole, the study confirms that the optimization of coating protection ability needs to take into account both maximization of the barrier effect as well as maximization of the degree of epoxy-amino cross-linking.

INVESTIGATION OF POROUS ANODIC FILM FORMATION ON AA1050 BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

2019 ◽  
Vol 27 (08) ◽  
pp. 1950186
Author(s):  
M. DANIŞMAN ◽  
M. KOCABAŞ ◽  
M. CURIONI ◽  
N. CANSEVER
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Film Formation ◽  
Oxide Formation ◽  
Porous Oxide ◽  
A Charge ◽  
Eis Analysis ◽  
Scanning Electron

In this study, the formation of porous Al2O3 on commercial 1050 aluminium alloy (AA1050) in 2[Formula: see text]M sulfuric acid (H2SO4) electrolyte was investigated. Anodization was performed at 12[Formula: see text]V and 15[Formula: see text]V specimens for a charge density of 757[Formula: see text]mC/cm2 and 3231[Formula: see text]mC/cm2. The resulting oxides were analyzed using scanning electron microscopy (SEM). According to analysis, a hexagonal oxide formation containing more than one nano pore was observed on the surface of the specimen. The structural properties of the porous oxide film were analyzed with electrochemical impedance spectroscopy (EIS) analysis and film-related features such as thickness of the porous and the barrier layer were obtained.

scholarly journals Influence of Hydrotalcite Containing Corrosion Inhibitormodified by Silane on Corrosion Protection Performance of Epoxy Coating

2017 ◽  
Vol 33 (4) ◽  
Author(s):  
Nguyen Tuan Anh ◽  
Ngo Thi Hoa ◽  
To Thi Xuan Hang ◽  
Nguyen Thuy Duong ◽  
Trinh Anh Truc
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Succinic Acid ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Epoxy Coating ◽  
Epoxy Coatings ◽  
Adhesion Measurement ◽  
Protective Performance

Abstract: Zinc aluminum hydrotalcite containing 2-benzothiazolythio-succinic acid (HT-BTSA) and modified by 2-aminoethyl-3-aminopropyltrimethoxysilane (APS) at different concentrations (3%, 5% and 10%). APS modified HT-BTSA (HT-BTSA-S) was incorporated in epoxy coatings at 3% concentration. The corrosion protective performance of the epoxy coatings containing HT-BTSA-S were evaluated by electrochemical impedance spectroscopy, adhesion measurement.  The results showed that the presence of HT-BTSA-S improved protection performance of epoxy coating and the best protection was obtained with HT-BTSA modified with 5 % APS.  

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