Electrochemical Behavior of Titanium Alloy in 3

Ame, M. A., A. M. Fekry, and S.M.Shanab, "Electrochemical Behavior of Titanium Alloy in 3", Int. J. Electrochem. Sci., 2011.


Marine environment is a complex corrosive system and presence of red algae is one of the factors that influence corrosion processes. Biofouling is one of the major impediments in the use of titanium in sea-water cooled condensers of power plants, which is otherwise an excellent material with respect to corrosion resistance. Electrochemical impedance spectroscopy (EIS) experiments were carried out in 3.5% NaCl to study the corrosion inhibition effect of red algal extracts on Ti-6Al-4V surfaces. The results indicated that the type of extract, the extract concentration and the immersion time affect the inhibition efficiency (IE%). In general, corrosion rate for J1, J2 and J3 [Successive extractions by hexane (J1), ethyl acetate (J2) and methanol (J3)] decreases with increasing its concentration or immersion time. The order of IE% was found to be J3 ? J1 ? J2. Langmuir adsorption isotherm was found to fit well the experimental data. Values were calculated for the adsorption process and it is seemed to be in the order of: J3 (365.66 ppm-1) ? J1 (150.42 ppm-1) ? J2 (58.35 ppm-1).