Publication: Development of hydrophobic polyurethane nanocomposite coating for metal protection
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Date
2024-08-01
Authors
Chuah Jun Nong
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Abstract
Polyurethane (PU) paint has been widely used to provide protection for the metallic structure from the corrosion. The application of the PU paint to the metal surface can greatly increase its lifetime. In this project, the brushing coating technique was employed to coat the PU paint onto the 304 stainless steel surfaces. The brushing coating was carried out at different brushing times to determine the optimum parameters. Further, the hydrophobic coatings were prepared by the addition of different ratio of HDTMS to nano particles, different ratio between CeO2 and SiO2, different weight percentage of nano particles, and the addition of self-healing agent (DMG, HEDS, and CuCl2) into commercial PU paint. Then, the properties of the fabricated coatings were characterized by WCA, FTIR, SEM, AFM, and corrosion resistance test. The optimum brushing times used to coat the PU paint was 3 times with 30 minutes interval. When the HDTMS, nano SiO2, and nano CeO2 were added into the PU paint, the WCA was showed improvement from 0.5o to 46.1o. For the FTIR analysis, the FTIR peaks showing the important PU bonds existed in the fabricated samples. In the SEM analysis, there were presence of nano particles in the fabricated PU paint. Moreover, in the hardness testing, the hardness number (HV) was increase when the nano particles weight percentage increase. The nano particles dispersed in the PU coating also can enhance the corrosion resistance of the stainless steel. The corrosion rate of the PU coating was improved from 55.19% to 97.36% due to the presence of nano particles act as the barrier to reduce the corrosive ion in contact with the stainless-steel surface.