Adsorption and inhibition effect of benzotriazole on brass-118 and brass-MM55 in artificial seawater

Gerengi H., Bereket G.

PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES, vol.48, no.3, pp.361-366, 2012 (SCI-Expanded) identifier identifier


Corrosion behaviours of the new type special commercial brass alloys, called 118 and MM55, have been investigated by Tafel Extrapolation (TP) and Linear Polarization (LP) methods in artificial seawater. Inhibition effect of benzotrizole (BTA) of four different concentrations for the corrosion of brass samples was investigated. It was found that BTA was acting as mixed type inhibitor and inhibition efficiency was increasing with the increase of BTA concentration. The change of the degree of surface coverage (theta) as a function of inhibitor concentration (c) shows that BTA follows Langmuir adsorption isotherm. Values of adsorption equilibrium constants (K (ads)) and values of free energies of adsorption (Delta G (ads)) were calculated from adsorption isotherms. Results reveal that chemisorption is the initial step of inhibition processes.