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- Title
Obtaining and Corrosion Performance of Composite Zinc Coatings with Incorporated Carbon Spheres.
- Authors
Boshkova, Nelly; Kamburova, Kamelia; Koprinarov, Nikola; Konstantinova, Mariana; Boshkov, Nikolai; Radeva, Tsetska
- 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.
- Subjects
ZINC coatings; COMPOSITE coating; ZINC coating; EPOXY coatings; SPHERES; PROPYLENE oxide; COATING processes
- Publication
Coatings (2079-6412), 2020, Vol 10, Issue 7, p665
- ISSN
2079-6412
- Publication type
Article
- DOI
10.3390/coatings10070665