title: Adsorption and inhibitive properties of a Schiff base for the corrosion control of carbon steel in saline water.
abstract: A Schiff base, namely N-(2-hydroxybenzylidene) thiosemicarbazide (HBTC), was investigated as inhibitor for carbon steel in saline water (SW) using electrochemical measurements such as: potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The morphology of the surfaces before and after corrosion was examined by Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM/EDS). The results showed that HBTC acts as corrosion inhibitor in SW by suppressing simultaneously the cathodic and anodic processes via adsorption on the surface which followed the Langmuir adsorption isotherm; the polarization resistance (R(p)) and inhibition efficiency (IE) increased with each HBTC concentration increase. SEM/EDS analysis showed at this stage that the main product of corrosion is a non-stoichiometric amorphous Fe(3+) oxyhydroxide, consisting of a mixture of Fe(3+) oxyhydroxides, α-FeOOH and/or γ-FeOOH, α-FeOOH/γ-FeOOH and Fe(OH)(3).
authors.affiliation: University of Craiova, Faculty of Chemistry, Craiova, Romania. samide adriana@yahoo.com
authors.forename: Adriana
authors.initials: A
authors.lastname: Samide
authors.forename: Bogdan
authors.initials: B
authors.lastname: Tutunaru
mesh_terms: D000327:Adsorption; D003343:Corrosion; D004563:Electrochemistry; D005290:Ferric Compounds / Q000737:chemistry; D006851:Hydrochloric Acid / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D054712:Salinity; D012663:Semicarbazides / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D013232:Steel / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D012663:Semicarbazides; D014867:Water; D013232:Steel; C021024:ferric hydroxide; D012965:Sodium Chloride; D006851:Hydrochloric Acid