title: Physicochemical studies of glucose, gellan gum, and hydroxypropyl cellulose--inhibition of cast iron corrosion.
abstract: Glucose, gellan gum, and hydroxypropyl cellulose were studied against the acid corrosion of cast iron by means of weight loss, potentiodynamic polarization, and AC impedance spectroscopy techniques. The inhibition efficiency was found to increase with increasing concentration of the inhibitors. The effect of immersion time and temperature were also studied. The addition of potassium iodide to the corrosion-inhibition system showed both antagonism and synergism toward inhibition efficiency. Polarization studies revealed the mixed-type inhibiting nature of the carbohydrates. The adsorption of inhibitors on the cast iron surface obeys Langmuir adsorption isotherm model, both in presence and absence of KI. Physical interaction between the inhibitor molecules and the iron surface was suggested by the thermochemical parameters, rather than chemical interaction.
authors.affiliation: Department of Chemistry, Periyar University, Salem 636011, Tamil Nadu, India.
authors.forename: Velayutham
authors.initials: V
authors.lastname: Rajeswari
authors.forename: Devarayan
authors.initials: D
authors.lastname: Kesavan
authors.forename: Mayakrishnan
authors.initials: M
authors.lastname: Gopiraman
authors.forename: Periasamy
authors.initials: P
authors.lastname: Viswanathamurthi
mesh_terms: D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D003343:Corrosion; D005947:Glucose / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D011193:Potassium Iodide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D011135:Polysaccharides, Bacterial; D011193:Potassium Iodide; C048288:gellan gum; D002482:Cellulose; C008079:hydroxypropylcellulose; D007501:Iron; D005947:Glucose