Abstract
Coating is one of the most effective measures to protect metallic materials from corrosion. Various types of coatings such as metallic, ceramic and polymer coatings have been investigated in a quest to find durable coatings to resist electrochemical decay of metals in industrial applications. Many polymeric composite coatings have proved to be resistant against aggressive environments. Two major applications of ferrous materials are in marine environments and in the oil and gas industry. Knowing the corroding behavior of ferrous-based materials during exposure to these aggressive applications, an effort has been made to protect the material by using polymeric and ceramic-based coatings reinforced with nano materials. Uncoated and coated cast iron pipeline material was investigated during corrosion resistance by employing EIS (electrochemical impedance spectroscopy) and electrochemical DC corrosion testing using the “three electrode system”. Cast iron pipeline samples were coated with Polyvinyl Alcohol/Polyaniline/FLG (Few Layers Graphene) and TiO2/GO (graphene oxide) nanocomposite by dip-coating. The EIS data indicated better capacitance and higher impedance values for coated samples compared with the bare metal, depicting enhanced corrosion resistance against seawater and “produce water” of a crude oil sample from a local oil rig; Tafel scans confirmed a significant decrease in corrosion rate of coated samples.
Highlights
Corrosion of various structural components and service pipelines are quite common in industrial applications
Deionized water was heated to 90 ◦ C and PVA was slowly added until a complete clear solution was obtained; it was followed by slow addition of PANI till the color of the solution changed to dark green
It was concluded that both polymeric-based as well as ceramic-based coatings provided protection against environmental attacks posed by seawater and “produced water”, the degree of against environmental attacks posed by seawater and “produced water”, the degree of resistance varied between the two electrolytes
Summary
Corrosion of various structural components and service pipelines are quite common in industrial applications. Many techniques are used for protecting the structures against corrosion: corrosion inhibitors [2,3]; cathodic and anodic protection [4,5]; design modification, alteration with environment and most importantly changing the material which is probably more corrosion resistant e.g., stainless steel [6]. It has been demonstrated that vinyl polymers remain unaffected in low acidic and alkaline environments and it reveals low water absorption behavior of PVA as it behaves as a corrosion inhibitor by forming complexes and covering surfaces to protect the metallic material from corrosion [12]. The current study discusses the relative corrosion resistance performances of the two coatings. Corrosion resistance of the coatings was analyzed using both plots
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