Green corrosion coating using palm oil based urethane acrylate (POBUA) on mild steels in 3.5 NaCl solution

The in situ inter calative polymerisation of acrylated palm oil and isocyanate with the presence of Hidroxyethylacrylate (HEA) was undertaken to produce Palm Oil Based Urethane Acrylate (POBUA). Several coatings formulations from POBUA with different types of photoinitiators were prepared and applied on a mild steel surface before being exposed under UV irradiation toward green anticorrosion coatings formation. The disappearance of the FTIR spectrum of cured POBUA coatings at around 810 cm−1 has confirmed the development of the crosslinked network. Soxhlet extraction and pendulum hardness test were carried out to investigate the crosslinked network performance in the cured film. Meanwhile, potentiodynamic polarization analysis in 3.5% NaCl solution was conducted to explain the anticorrosion mechanism of POBUA, and the TAFEL plot was manipulated in measured the corrosion rate of mild steel. Contact angle (CA) and X-Ray Diffraction analysis are also demonstrated in this work in order to study the surface properties of POBUA. The results indicate mild steel coated with POBUA film owes better corrosion resistance compared to blank mild steel. Crosslink polymer network formation from POBUA has effectively protected the mild steel surface from corrosion agents such as oxygen and water. CA result also showed hydrophobicity behavior of POBUA gives value-added properties in reducing corrosion process.