Anti-Corrosion Properties of Polyaniline/Polyurethane Composite Coatings on Mild Steel Using Coconut-Based/PPG Blend Polyols Marjune T. Bonilla 1,2,3,a* , Archie G. Ruda 1,2,b , Dave Joseph E. Estrada 4,c , Kurt Sterling M. Ubas 1,2,d Aaron Andrew B. Mutia 1,2,e , Arnold A. Lubguban 4,f , Rey Y. Capangpangan 5,g , Joselito P. Labis 6,h , Amierson C. Tilendo 7,I , Noel Lito B. Sayson 1,2,j and Arnold C. Alguno 1,2,k 1 Department of Physics, MSU- Iligan Institute of Technology, Tibanga, Iligan City, Philippines 2 Premier Research of Science and Mathematics (PRISM), MSU-IIT, 9200 Iligan City, Philippines 3 University of Science and Technology of Southern Philippines 4 Bio-Products Research Laboratory, MSU-IIT, Iligan City, Lanao Del Norte, 9200, Philippines 5 Department of Physical Sciences and Mathematics, MSU-Naawan, Misamis Oriental, Philippines 6 King Abdullah Institute for Nanotechnology, King Saud University, 11451 Riyadh, Saudi Arabia 7 Mindanao State University-Main, Marawi City, Philippines a marjune.bonilla@g.msuiit.edu.ph and marjune.bonilla@ustp.edu.ph, b archie.ruda@g.msuiit.edu.ph, c davejoseph.estrada@g.msuiit.edu.ph, d kurtsterling.ubas@g.msuiit.edu.ph, e aaronandrew.mutia@g.msuiit.edu.ph, f arnold.lubguban@g.msuiit.edu.ph, g rycapangpangan@carsu.edu.ph, h jlabis@ksu.edu.sa, i amierson.tilendo@msumain.edu.ph, j noellito.sayson@g.msuiit.edu.ph, and k arnold.alguno@g.msuiit.edu.ph Keywords: Polyurethane-based protective coating, coconut-based/PPG blend polyols, Polyaniline/Polyurethane composite coatings, Potentiodynamic polarization (tafel plot), contact angle, adhesion test, FESEM, anti-corrosion Abstract. Polyurethane coating has been widely used as a protective coating due to its wide range of mechanical strength, excellent abrasion resistance, toughness, low-temperature flexibility, and chemical resistance, simplicity in production and application, and superior protection on corrosion to mild steel. No studies have been reported utilizing coconut-based/PPG blend polyols to produce polyurethane-based protective coatings on mild steel. Therefore, in this work, we fabricated polyurethane-based protective coating using coconut-based/PPG blend polyols for anti-corrosion application. Due to low adhesion strength of Polyurethane-based protective coating, the incorporation of nano-fillers into the polymer matrix improved the adhesion strength of the coating due to its functional benefits and its effects gave rise to increased intermolecular bonding, hydrogen bonding, van der waals, magnetism, and surface energy. Therefore, we fabricated PANI/PU composite coatings with varied amounts of polyaniline nanoparticles on mild steel using coconut-based/PPG blend polyols exposed in 3.5 wt% NaCl aqueous solution for anti-corrosion application. Characterizations like Fourier Transform Infrared Spectroscopy (FTIR), Potentiodynamic Polarization (Tafel plot), contact angle, adhesion test, FESEM, XRD, and UV-VIS were used in this study. Tafel plot revealed that PU-based and PANI/PU composite coatings exhibited a significant reduction in corrosion current density (Icorr), perhaps due to the adsorption of inhibitor in the surface of the mild steel which reduced corrosion rate of the metal by retarding the anodic process and impeding the corrosive species from the surroundings. Among all fabricated coatings, 0.5-PANI/PU composite coating was the best, having a less corrosion rate of 5.66x10 -5 mmpy compared to others. In addition, its surface was more compact, smooth, rigid, and no voids present at the interface according to the result of FESEM, suggesting better corrosion protection to mild steel. Hence, PU-based protective coating and PANI/PU composite coatings using coconut-based/PPG blend polyols inhibited the penetration of the corrosive species and served as an adequate barrier protection against corrosion for mild steel. Solid State Phenomena Submitted: 2022-11-18 ISSN: 1662-9779, Vol. 351, pp 89-102 Revised: 2023-07-14 doi:10.4028/p-L7lHcU Accepted: 2023-07-15 © 2023 Trans Tech Publications Ltd, Switzerland Online: 2023-10-27 All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications Ltd, www.scientific.net. (#627438360, MSU-Mindanao State University – Iligan Institute of Technology (IIT), Iligan, Philippines- 16/11/23,12:08:53)