title: Polysaccharide from Plantago as a green corrosion inhibitor for carbon steel in 1M HCl solution.
abstract: Polysaccharide from Plantago ovata was investigated for its inhibition characteristics for carbon steel corrosion in 1M HCl. The mucilage of the Plantago is comprised of a highly branched polysaccharide, arabinosyl (galaturonic acid) rhamnosylxylan (AX), which is mainly responsible for the corrosion inhibition of the carbon steel. The techniques that were used to assess the inhibition and adsorption properties of the AX in the acid solution are gravimetric method, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), atomic force microscopy (AFM), UV-vis spectroscopy and FTIR. Thermodynamic and activation parameters revealed that the spontaneous adsorption of AX on carbon steel was mixed type and predominantly chemical in nature. Quantum chemical analysis supports the proposed mechanism of inhibition. AX from Plantago could serve as a green corrosion inhibitor for the carbon steel in hydrochloric medium with good inhibition efficiency but low risk of environmental pollution.
authors.affiliation: Corrosion Research Laboratory, Department of Applied Chemistry, Faculty of Engineering & Technology, Aligarh Muslim University, Aligarh 202002, India. Electronic address: drmmobin@hotmail.com.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Mobin
authors.affiliation: Corrosion Research Laboratory, Department of Applied Chemistry, Faculty of Engineering & Technology, Aligarh Muslim University, Aligarh 202002, India.
authors.forename: Marziya
authors.initials: M
authors.lastname: Rizvi
mesh_terms: D002244:Carbon; D003343:Corrosion; D010943:Plantago / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D013232:Steel
chemical_list: D011134:Polysaccharides; D013232:Steel; D002244:Carbon
keywords: Corrosion inhibition; EIS; Plantago polysaccharide; Potentiodynamic polarization; SEM