Abstract
The present work describes one possible way to prepare a stable aqueous suspension of carbon sphere particles with a positive charge that is suitable for simultaneous electrodeposition with zinc on steel substrate. In order to stabilize the suspension against aggregation, tri-block amphiphilic copolymer Pluronic F127, which is commercially available, was adsorbed on the surface of carbon sphere particles. This polymer contained poly (ethylene oxide) blocks as hydrophilic segments and poly (propylene oxide) blocks as the hydrophobic part. Scanning electron microscopy and visual observations confirmed the stability of the obtained suspension. The carbon sphere particles were embedded into the zinc coating by the co-electrodeposition process. The surface morphology of the composite coating was investigated using scanning electron microscopy. The influence of the carbon spheres on the cathodic and anodic processes was evaluated with cyclic voltammetry studies. The electrochemical investigations were realized in a model corrosion medium (5% NaCl solution with pH 6.7) by application of selected methods such as polarization resistance, potentiodynamic polarization, and electrochemical impedance spectroscopy, which revealed higher protective ability of the composite coating against corrosion in an aggressive environment.
Highlights
Zinc is generally applied to ensure galvanic protection against corrosion of steel as it exhibits an anodic character with respect to iron and dissolves first in an aggressive environment
The effect of surfactants on dispersion of carbon nanotubes (CNTs) and carbon black particles was recognized due to decrease in the particle sizes. The aim of this investigation was the fabrication of homogeneous zinc–carbon composite coating from a slightly acidic sulfate solution containing well dispersed microsized carbon spheres (CSp)
We demonstrated the feasibility of the carbon spheres for enhancing the protective efficiency against corrosion of ordinary zinc coating on steel
Summary
Zinc is generally applied to ensure galvanic protection against corrosion of steel as it exhibits an anodic character with respect to iron and dissolves first in an aggressive environment Dissolution of this metal in a neutral corrosion medium containing Cl− -ions leads to the creation of a layer of corrosion products on the surface. The effect of surfactants on dispersion of CNTs and carbon black particles was recognized due to decrease in the particle sizes The aim of this investigation was the fabrication of homogeneous zinc–carbon composite coating from a slightly acidic sulfate solution containing well dispersed microsized carbon spheres (CSp). We demonstrated the feasibility of the carbon spheres for enhancing the protective efficiency against corrosion of ordinary zinc coating on steel
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