title: Performance evaluation of pectin as ecofriendly corrosion inhibitor for X60 pipeline steel in acid medium: experimental and theoretical approaches.
abstract: The corrosion inhibition effect of pectin (a biopolymer) for X60 pipeline steel in HCl medium was investigated using weight loss, electrochemical, water contact angle measurements, and scanning electron microscopy techniques. The results obtained show that pectin acts as a good corrosion inhibitor for X60 steel. Inhibition efficiency increased with increase in pectin concentration and temperature. Potentiodynamic polarization results reveal that pectin could be classified as a mixed-type corrosion inhibitor with predominant control of the cathodic reaction. The effective corrosion inhibition potential of pectin could be related to the adsorption of pectin molecules at the metal/solution interface which is found to accord with the Langmuir adsorption isotherm model and a protective film formation. Quantum chemical calculations provided insights into the active sites and reactivity parameters governing pectin activity as a good corrosion inhibitor for X60 steel.
authors.affiliation: Centre of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. Electronic address: umoren@kfupm.edu.sa.
authors.forename: Saviour A
authors.initials: SA
authors.lastname: Umoren
authors.affiliation: Centre of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
authors.forename: Ime B
authors.initials: IB
authors.lastname: Obot
authors.affiliation: Centre of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
authors.forename: A
authors.initials: A
authors.lastname: Madhankumar
authors.affiliation: Centre of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
authors.forename: Zuhair M
authors.initials: ZM
authors.lastname: Gasem
mesh_terms: D000143:Acids; D000327:Adsorption; D003343:Corrosion; D055664:Electrochemical Techniques; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D010368:Pectins / Q000737:chemistry*; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D013232:Steel / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000143:Acids; D014867:Water; D013232:Steel; D010368:Pectins
keywords: Acid corrosion; Carbon steel; Corrosion inhibition; Electrochemical techniques; Pectin; Surface analysis