Corrosion Inhibitive Evaluation of an Environmentally Friendly Water-Base Acrylic Terpolymer on Mild Steel in Hydrochlor
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RODUCTION
MANY industrial sections such as the acid cleaning bath, the water cooling system, various refinery units, pipelines, chemical operations, steam generators, ballast tanks, oil, and gas production units are involved with inhibitors due to high corrosion rates in these parts.[1–6] Recently, the use of polymers as corrosion inhibitors has attracted considerable attention because of their inherent stability and cost effectiveness.[7–11] Owning to multiple adsorption sites, the polymeric compounds adsorb more strongly on the metal surface in comparison with their monomer analogues. In addition, they can form complexes with metal ions on the metal surface; therefore, it is expected that the polymers will act as appropriate corrosion inhibitors.[10,12–14] Also, it has been reported that the toxicity of polymers is less than their monomer analogs.[14–16] Generally, various types of polymers, which are employed as corrosion inhibitors, can be classified into two groups: (1) synthetic polymers such as polyvinyl alcohol, polyethylene glycol, polyacrylic acid, polyacrylamide, polyaniline derivatives, and polyvinyl pyrollidone;[13,17–21] and (2) natural polymers such as saccharides, plant extracts, and natural honey.[22–25] MOJTABA VAKILI AZGHANDI, Master of Science Student, ALI DAVOODI, Associate Professor, and GHOLAM ALI FARZI, Assistant Professor, are with the Materials and Polymers Engineering Department, Hakim Sabzevari University, Sabzevar 391, Iran. Contact e-mail: [email protected] ALI KOSARI, Master of Science Student, is with the Materials and Metallurgical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 917751111, Iran. Manuscript submitted June 20, 2012. Article published online August 21, 2013 METALLURGICAL AND MATERIALS TRANSACTIONS A
Since most of the polymeric inhibitors are insoluble in aqueous solutions, it is common to solve them in an organic solvent before adding them in corrosive environments. This process is subject to an environmental issue, and consequently numerous attempts were made to replace it by more environmentally friendly methods.[11,16,22] In this perspective, water-base acrylic polymers having functional groups of OH and COOH are being mentioned as corrosion inhibitors in different corrosive media. This type of polymer does not need to solve in organic solvent, and most of them are environmentally friendly compounds.[11,26] The increase in hydrocarbon chain length in polymers decreases their solubility. On the other hand, the presence of hydrophilic functional groups (OH, COOH, and NH2) increases their solubility. As a result of less solubility and emulsification characteristics, the aforementioned copolymers do not need to solve in an organic solvent.[11] Also, it has been reported that water-base acrylic polymers have more stability and inhibitive behavior than other copolymers and polymers such as acrylic.[11,27,28] Several researchers introduced some water-soluble polymers as inhibitors for iron and cadmium.[11,29] They found that the hydroxyl gr
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