Abstract
In this study, two formulae (F1 and F2) of epoxy/2pack coatings incorporated with polypyrrole (PPy)-conducting polymer were produced from bisphenol-A type of epoxy resin (DGEBA) with the addition of Ag and ZnO nanoparticles. The synergism effect of Ag and ZnO nanoparticles on the mechanical and corrosion resistance properties was reported. The curing agent 2,4,6-tris (dimethylaminomethyl) phenol (ARADUR 3282-BD) was used under optimized stoichiometry values. The nanoparticles ratio in different wt.% were first dispersed in solvent by the sonication process and then added to epoxy/PPy composition. All the coated steel panels were cured at room temperature in a controlled dust free environment for 7 days in order to obtain a hard and intact coating. The dispersion of nano-size ZnO and Ag pigments was investigated using scanning electron microscopy (SEM) and its composition through an energy dispersive X-ray (EDX) technique. Conventional techniques and nano-indentation were also performed to observe the effect of ZnO and Ag synergism content on the hardness and modulus of elasticity at nano scale. The corrosion behavior of the coated samples was investigated at room temperature in 3.5% NaCl solution using electrochemical impedance spectroscopy (EIS). The synergism effect of nanoparticles along with PPy resulted in an enhancement of mechanical and corrosion-resistant properties.
Highlights
The three-layer coating system with poor surface preparation and application may lead to blistering, pinholes, peeling, lifting due to the poor adhesion to the substrate or due to the inter-coat adhesion
The results showed better corrosion resistance efficiency of Ag-incorporated nano-coatings as compared to others
The results suggest that increasing amount of nanoparticles in epoxy is responsible in enhancing surface properties of coatings and making it difficult to be affected by external stimuli
Summary
The three-layer coating system with poor surface preparation and application may lead to blistering, pinholes, peeling, lifting due to the poor adhesion to the substrate or due to the inter-coat adhesion. Conjugated conducting polymer (CP) have attracted huge interest both in academic and research topics recently for their various applications such as corrosion protection, light-emitting diodes, sensors and actuators, electromagnetic interference shielding and electrostatic charge dissipation, catalysts and energy conversion systems [4,5,6,7,8,9,10]. Mengoli et al [11] and DeBerry [12] demonstrated firstly that CP can be used in corrosion control, and that an intensive effort has been carried out to expand such coating systems. This has been provoked by the need to substitute chromium (VI)-based coatings for corrosion control of iron and aluminum alloys. Several research works have been accomplished with CP addition to control the corrosion of non-ferrous metals [9] and ferrous metals [10]
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