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    Adsorption Behavior and Inhibition Corrosion Effect of Sodium Carboxymethyl Cellulose on Mild Steel in Acidic Medium
    (PEKING UNIV PRESS, 2008) Bayol, E.; Guerten, A. A.; Dursun, M.; Kayakirilmaz, K.
    The effect of sodium carboxymethyl cellulose (Na-CMC) on the corrosion behavior of mild steel in 1.0 mol.L-1 HCl solution has been investigated by using weight loss (WL) measurement, potentiodynamic polarization, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) methods. These results showed that the inhibition efficiency of Na-CMC increased with increasing the inhibitor concentration. Potentiodynamic polarization studies revealed that the Na-CMC was a mixed type inhibitor in 1.0 mol.L-1 HCl. The adsorption of the inhibitor on mild steel surface has been found to obey the Langmuir isotherm. The effect of temperature on the corrosion behavior of mild steel in 1.0 mol.L-1 HCl with addition of 0.04% of Na-CMC has been studied in the temperature range of 298-328 K. The associated apparent activation energy (E-a(*)) of corrosion reaction has been determined. Scanning electron microscopy (SEM) has been applied to investigate the surface morphology of mild steel in the absence and presence of the inhibitor molecules.
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    The inhibitive effect of hexamethylenetetramine on the acid corrosion of steel
    (ELSEVIER SCIENCE SA, 2007) Bayol, E.; Kayakirilmaz, K.; Erbil, M.
    The efficiency of hexamethylenetetramine (HMTA), as corrosion inhibitors for steel in de-aerated 0.3M HCl, 0.1M H2SO4 and 0.1M H2SO4 + 1.0 x 10(-3) M HCl solutions have been determined by electrochemical studies. It was found that the HMTA acts a good corrosion inhibitor for steel corrosion in acids solutions. Increase in inhibition efficiency with the increase of concentrations of HMTA shows that inhibition actions are due to adsorption on the steel surface and adsorption follows the Langmuir isotherm. From the adsorption isotherms values of equilibrium constant (K-ads) values of free energies of adsorption (Delta G(ads)degrees), were calculated. The effect of temperature on the corrosion behaviour in the presence of 1.0 x 10(-1) M inhibitors was studied in the temperature range of 293-323 K. The inhibition efficiency of HMTA increased with increasing temperature up to 323 K. Activation energies (E-a*) were calculated from the obtained corrosion rates at different temperatures. Results obtained from both potentiodynamic polarisation and AC impedance measurements reveal that the compound is an effective inhibitor for the corrosion of steel and behave better in HCl than in H2SO4. Surface analyses were also carried out to establish the mechanism of corrosion inhibition of steel in acidic media. (c) 2007 Elsevier B.V. All rights reserved.