The effect of epoxy and non-epoxy coating treatment on the corrosion of low carbon steel in sodium chloride solutions Rama P. Dwinanda, Luthfi A.F. Haryoko, Jundika C. Kurnia ⇑ Department of Mechanical Engineering, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak Darul Ridzuan, Malaysia article info Article history: Received 12 June 2020 Received in revised form 13 July 2020 Accepted 14 July 2020 Available online xxxx Keywords: Epoxy and non-epoxy coating Corrosion prevention Low carbon steel Corrosion rate Oil and gas industry abstract Coating is one of the common methods of corrosion prevention for any industries. However it has some limitations such as highly dependable on the composition of coating and could lead to localized corrosion due to damage to the coating from mechanical impact. This experiment aim to investigate the effect of coating on low carbon steel in terms of corrosion rate and material strength by immersion test with 3.5%wt NaCl solution for two months with various conditions, i.e., no coating, non-epoxy coating, epoxy coating and damaged (scratched) coating. Initial and final thickness of samples were taken to calculate the estimation average corrosion rate for each experiment condition, and compression test method were used to determine the samples strength. It is shown that coating can decrease corrosion rate for about 78%À92% and 18% higher average compression strength as compared to those without coating. Ó 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the Innovative Manufactur- ing, Mechatronics & Materials Forum 2020. 1. Introduction For years, oil and gas industry has been strongly relied on utiliz- ing metals for its various processes from oil/gas extraction, crude oil transportation, refinery to product transport. The inherent chal- lenges with utilization of metal equipment is corrosion which is gradual degradation of metal due to its electrochemical interaction with the environments, which may lead to its failures [1]. Corro- sion has received considerable attention from oil and gas industry as its main problem in exploration and production activities. It is estimated that the overall cost of corrosion in oil and gas industry can reach up to $1.372 billion/ yearly, with $589 million spent in maintaining surface pipeline and facility costs, $436 million in downhole tubing expenses, and the remaining dollar used in capi- tal expenditures related to corrosion [2]. There are a few methods for protecting base material from corrosion such as cathodic pro- tection, coating, material selection, and corrosion inhibitor. Coating is the most commonly adopted corrosion prevention method for steel, due to its low cost and simple application to be used as cathodic or galvanic protection [3]. Coating act as a barrier that eliminates one of the factors for corrosion to occur which is elec- trolyte. Corrosion process requires at least two reactions that must occur in a partial corrosive environment [4]. The major environmental factors that could affects corrosion in oil and gas industry are H 2 S, Chloride, O 2 , and NaCl from seawater content [5]. Coating can protect the material from those factors, but sometimes due to mechanical impact, coating could be dam- aged and thus the base material will be exposed to the environ- ment. Due to this contact, anodic, and cathodic reaction will occur on the metal surface, as presented in Table 1 [6–8], resulting in localized corrosion. Moreover, mechanical impact may induce microcracking which is very difficult to be detected and almost impossible to be mitigated properly [9]. Combination of localized corrosion and microcracking will compromise the pipeline and structure integrity, leading to pipeline leakage, structure failure and other serious consequence. The most common reason of failure in coating is the coating system itself. Coating system refers to the formulation of the coating that can cause chalking, erosion, and crackling. Coating system also refers to the adhesion of coating and metal such as blistering, peeling, and flaking [7]. In addition, incorrect application of coating onto metal surface can cause holi- day, pinholes, and cratering [8]. In order to increase the protection performance, the applied coating should have the following characteristics, i.e., (i) good adhesivity with the metal, (ii) minimum discontinuity in the coat- ing (porosity), (iii) high resistance to electron, (iv) sufficient thick- https://doi.org/10.1016/j.matpr.2020.07.371 2214-7853/Ó 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the Innovative Manufacturing, Mechatronics & Materials Forum 2020. ⇑ Corresponding author. E-mail address: jundika.kurnia@utp.edu.my (J.C. Kurnia). Materials Today: Proceedings xxx (xxxx) xxx Contents lists available at ScienceDirect Materials Today: Proceedings journal homepage: www.elsevier.com/locate/matpr Please cite this article as: R. P. Dwinanda, L. A. F. Haryoko and J. C. Kurnia, The effect of epoxy and non-epoxy coating treatment on the corrosion of low carbon steel in sodium chloride solutions, Materials Today: Proceedings, https://doi.org/10.1016/j.matpr.2020.07.371