Research Article High-Performance Anticorrosive Polyester Coatings on Mild Steel in Mixed Acid Mixtures Environments Bashir Ahmad , 1 Nasir M. Ahmad , 1 Muhammad Yasir , 1 Zulfiqar A. Khan , 2 and Sikander Rafiq 3 1 Polymer Research Lab, Department of Materials Engineering, School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), H-12 Sector, Islamabad 44000, Pakistan 2 Bournemouth University, Department of Design and Engineering, NanoCorr, Energy & Modelling (NCEM) Research Group, Dorset, Poole BH12 5BB, UK 3 Department of Chemical Polymer & Composite Materials Engineering, University of Engineering & Technology, Lahore (New Campus), Pakistan Correspondence should be addressed to Nasir M. Ahmad; nasir.ahmad@scme.nust.edu.pk Received 15 April 2019; Accepted 26 August 2019; Published 19 December 2019 Academic Editor: Alexandra Muñoz-Bonilla Copyright © 2019 Bashir Ahmad et al. is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Mild steel sample was selected from acid storage tanks used in industry as a substrate, and two advanced technological polymeric resin-based coatings were developed, designated as LAM-P resin based which is LAM-P/FR coating and LAM-V resin based which is LAM-V/FR coating. ese coatings were applied over steel samples by using the hand lay-up process. FTIR test was conducted to confirm complete curing, and SEM analyses were used to investigate surface morphology. A series of electrochemical tests were performed in acidic environment (mixed acid solution 56% H 2 SO 4 + 26% HNO 3 + 18% H 2 O by weight). e results indicated successful development of LAM-P/FR and LAM-V/FR to obtain coatings with desirable characteristics such as anticorrosion, thickness, adhesion, stability, charge store and more resistance to acidic environments. EIS data for mixed acid storage media demonstrated that LAM-V/FR coating has higher strength in mixed acid solution, higher values of impedance and phase shiſt, higher value of R pore , and low value of C c , Corrosion rate percentage reduction is 96% of LAM-P/FR and 99.96% of LAM-V/FR compared to bare mild steel sample. e outcomes of this study can lead to assist in design guidelines for anticorrosive coating for industrial applications. 1. Introduction Corrosion is electrochemical decay of materials and is caused by the reaction between materials and aggressive or corrosive environments. Metals are most susceptible to this type of impact because they contain free electrons and can form elec- trochemical cells within their structure [1]. Corrosion results in significant economic loss, and it slows down the economic growth of all countries. e annual cost of corrosion world- wide is estimated to be 2.2 trillion US dollars. National Association of Corrosion Engineers (NACE) estimated that the direct cause of corrosion in the United States was 276 bil- lion dollars in 2014, approximately 3.1% of gross domestic product (GDP). However, by including the indirect losses of corrosion, it was estimated to exceed 1 trillion US dollars. When sulfuric acid (H 2 SO 4 ) and dilute nitric acid (HNO 3 ) are mixed together, they became highly corrosive. Corrosion with in acid storage tank is dependent on several factors such as temperature, concentration of corrosive constituents, oper- ational condition, and the purity of acids being used [2]. Mild steel corrosion rate in 95% H 2 SO 4 is 5–20 mm/year when the temperature is less than 25°C. is depends on the material from which the tank is made and the purity of the received acid [3]. Corrosion is probably one of the most concerning issues that is faced in practical applications, thus different research strategies being added throughout the globe for the sole pur- pose of protecting different material from corrosion in various areas of applications. Many techniques are being used for pro- tecting the structures from corrosion by adding corrosion inhibitors [4, 5], by applying cathode and anode protection [6, 7], design modification, alteration with environments, and most importantly changing the material which is more corro- sion resistant, for example stainless steel [8]. Application of Hindawi Advances in Polymer Technology Volume 2019, Article ID 3954784, 13 pages https://doi.org/10.1155/2019/3954784