Preparation and characterization of an anticorrosion coating via solution-casting of polystyrene with CeO₂ and clay in D-limonene

• A.P. Ogrimina¹, A.J.K. Sia¹, M.D.M. Ajero¹, M.T. Natividad² and D.P. Penaloza Jr¹

¹ Department of Chemistry, College of Science, De La Salle University, Manila, 0922 Philippines
² Department of Physics, College of Science, De La Salle University, Manila, 0922 Philippines

Abstract: In this work, an environment-friendly and corrosion-resistant polystyrene (PS)-based coating was prepared by adding clay (C20A) and/or CeO₂ in PS dispersed in D-limonene. PS dispersions added with C20A and/or CeO₂ of varying concentrations were prepared and applied on metal coupons. The cured coatings were characterized by contact angle measurement, immersion test, cross-hatch adhesion test, thermogravimetric analysis, and scanning electron microscopy. Experimental runs were compared against a commercial epoxy primer as a control. Anticorrosion PS-based coatings were successfully prepared via solution-casting and the optimal concentration of PS in limonene is 9 wt%. Results of the different characterization methods of the coating revealed that the PS with 5% w/w C20A stood out with excellent anti-corrosion and adhesion properties and thermal stability among the coating treatments despite reduced hydrophobicity compared to the pure PS coating. With a corrosion rate and corrosion inhibition efficiency of 0.023263 mm·y^–1 and 65.88%, respectively, 5% w/w C20A performed remarkably better among other treatments as well as against the commercial epoxy. The blending of 5% w/w C20A resulted in the reinforced barrier properties of the PS coating which could be explained by the successful dispersion of the C20A nanoparticles as confirmed in its SEM micrograph.

Keywords: corrosion, clay, polystyrene, anticorrosion coating, limonene

Int. J. Corros. Scale Inhib., 2025, 14, no. 4, 1785-1797
doi: 10.17675/2305-6894-2025-14-4-3

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