Advanced anticorrosive coatings prepared from electroactive epoxy–SiO2 hybrid nanocomposite materials |
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Authors: | Tsao-Cheng Huang Yu-An Su Tzu-Chun Yeh Hsiu-Ying Huang Chi-Phi Wu Kuan-Yeh Huang Yi-Chen Chou Jui-Ming Yeh Yen Wei |
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Affiliation: | aDepartment of Chemistry and Center for Nanotechnology at CYCU, Chung, Christian University, Chung Li 32023, Taiwan, ROC;bIndustrial Technology Research Institute, Hsinchu 30011, Taiwan, ROC;cDepartment of Applied Cosmetology and Graduate Institute of Cosmetic Science at Hungkuang University, Sha Lu, Taichung 443, Taiwan, ROC;dDepartment of Chemistry, Drexel University, Philadelphia, PA 19104, USA |
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Abstract: | A series of electroactive epoxy/amino-SiO2 nanocomposite materials containing conjugated segments of electroactive amino-capped aniline trimer (ACAT) unit were successfully prepared. First of all, the amino-modified silica (AMS) particles of ∼50 nm in diameter were synthesized by performing the conventional base-catalyzed sol–gel reactions of tetraethyl orthosilicate (TEOS) in the presence of (3-aminopropyl)-trimethoxysilane (APTES) molecules. Subsequently, the AMS nanoparticles were blended into the epoxy ring-opening polymerization reactions between amino-terminated aniline trimer (ACAT)/T-403 and DGEBA, leading to the formation of electroactive epoxy resin–silica hybrid nanocomposites (EES). Furthermore, the redox behavior of as-prepared EES materials was identified by the electrochemical cyclic voltammetry studies. It should be noted that the as-prepared electroactive hybrid materials in the form of coating on cold-rolled steel (CRS) electrode were found to be much superior in corrosion protection over those of non-electroactive epoxy (NEE) and electroactive epoxy (EE) materials based on a series of electrochemical corrosion measurements in saline. The possible mechanism for the advanced enhancement of corrosion protection of EES coatings on CRS electrode could be interpreted as follows: (1) electroactive epoxy coatings may act as physical barrier coating; (2) redox catalytic capabilities of ACAT units existed in electroactive epoxy may induce the formation of passive metal oxide layers on CRS electrode, as further evidenced by SEM and ESCA studies; (3) well-dispersed AMS nanoparticles in EES matrix could act as effective hinder to enhance the oxygen barrier property of electroactive epoxy matrix, the result could be demonstrated by gas permeability analysis (GPA). Electroactive epoxy/SiO2 nanocomposites were identified by a series of electrochemical measurements such as corrosion potential (Ecorr), polarization resistance (Rp), corrosion current (Icorr) and electrochemical impedance spectroscopy (EIS) studied in 5 wt% NaCl electrolyte. |
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Keywords: | Nanocomposite Silica Electroactive epoxy Corrosion |
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