Abstract
Polyaniline (PANI) is a conducting polymer that can be used for active corrosion protection of metals and metallic structures. In the present work, we describe the preparation of stable aqueous suspension of positively charged colloidal PANI-SiO2 particles suitable for electrodeposition with zinc on cathode (steel) surface. Stabilization of the suspension against aggregation is realized by adsorption of commercially available tri-block amphiphilic copolymer Pluronic F127 on the PANI-SiO2 particles surface. The polymer consists of polyethylene oxide (PEO) blocks as hydrophilic segments and polypropylene oxide (PPO) blocks as the hydrophobic part. Stability of the suspension is proved by scanning electron microscopy (SEM) and visual investigations. The PANI-SiO2 particles are incorporated into the zinc coating by co-deposition of the particles and zinc from zinc sulfate electrolyte solution. The surface morphology of the hybrid zinc coatings is investigated by recording the SEM images before and after treatment in a model corrosion medium (5% NaCl solution with pH 6.7). The electrochemical tests revealed higher resistance of the hybrid coating to corrosion compared to the ordinary zinc coating.
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