Obtaining and Corrosion Performance of Composite Zinc Coatings with Incorporated Carbon Spheres

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.

Studying the influence of current density and solution pH on corrosion properties of obtained Zn‐nano SiO2 electroplating layers

“…[4,5] It is important to optimize the conditions to obtain a composite coating with a good microstructure and particle dispersion because the quality of the composite coating depends on the plating conditions, besides the particle density, concentration and incorporation. [7][8][9] Tuaweri et al [9] studied the influence of current density, plating time, particle concentration, agitation on current efficiency, and precipitation properties of Zn-SiO2 composite coating. The results show that the Zn-SiO2 composite coating gave higher cathodic current efficiency at low current density, the SiO2 concentration of 26 g/L under stirring conditions.…”

“…[ 4,5 ] It is important to optimize the conditions to obtain a composite coating with a good microstructure and particle dispersion because the quality of the composite coating depends on the plating conditions, besides the particle density, concentration and incorporation. [ 7–9 ]…”

Evaluation of Corrosion Protection Performance of New Polymer Composite Coatings on Carbon Steel in Acid Medium by Electrodeposition Methods

“…The electropolymerization of conducting polymers onto the active area of metals and its alloys has been a topic of research, mostly conforming to the anticorrosion protection results of experiments carried out on composite polymer coatings [1][2][3][4][5][6]. The performance of these protective coatings, which provide a barrier to the substrate, can be influenced by various factors: the type of conducting polymer, the electropolymerization method used on the electrode's surface, and the type of aggressive environment [7][8][9][10][11]. The application of electrochemical polymerization mechanism, nanostructured coatings, applying organic or inorganic coatings, and cathodic and anodic protection are methods for decreasing corrosion on metallic materials [12][13][14][15][16][17].…”