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Effect of nano-ZnO particles on the corrosion resistance of polyurethane-based waterborne coatings immersed in sodium chloride solution via EIS technique |
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| Authors: | M. Rashvand Z. Ranjbar |
| Affiliation: | 1. Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, No. 55, Vafamanesh Street, Hossein abaad Square, Pasdaran Crossing, Tehran, Iran;2. Center of Excellence for Color Science and Technology, Institute for Color Science and Technology, Iran |
| Abstract: | Nano-composite coatings were formed by incorporating 3 wt% nano-ZnO in a polyurethane-based waterborne coating. The nano-ZnO based composite coatings were applied on standard phosphated steel panels by cathodic electrodeposition. The electrodeposited nano-composite coatings were then baked for 20 min at 165 °C. To investigate the corrosion resistance of the coatings, the coated panels were immersed in 3.5 wt% NaCl solutions for 2880 h (120 days). The improvement in corrosion performance of the composite coatings was evaluated using electrochemical impedance spectroscopy technique. It was found that the films containing nano-sized ZnO particles show a corrosion resistance of 2 orders of magnitude higher than that of the neat films. |
| Keywords: | Nano zinc oxide Corrosion Cathodic electrodeposition Electrochemical impedance spectroscopy |
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