The use of experimental design method for the investigation of pitting potential of aluminum

A. Tosun, M. Ergun, M. Balbaşı, M. Tamirci

Gazi University, Faculty of Architecture & Engineering, Chemical Engineering Department, 06570 Maltepe, Ankara, Turkey

Keywords

aluminum • pitting corrosion • experimental design • pitting potential • modelling

Abstract

The dependence of the pitting potential (Ep) of aluminum on chloride concentration, pH and the temperature of the solution was studied by the potentiodynamic method according to a statistical experimental design. The parameters of the statistical Ep model offered on the basis of Box-Wilson experimental design method were evaluated with the use of the experimental data. Comparison of the predicted values from the model with the observed values showed that the model is a good fit. From the model equation the most noble Ep value of - 420 mV was obtained when Cl- ion concentration, temperature and pH of the solution were 57 ppm, 22°C, and 8.3 respectively. Box-Wilson experimental design technique was proved to be applicable in modelling Ep of aluminum.