Analytical correlation between varying corrosion parameters and corrosion rate of Al–4.5Cu/10%ZrSiO4 composite in hydrochloric acid by rare earth chloride

The effect of varying temperature, time and inhibitor concentration on the corrosion rate of Al–4.5Cu/ZrSiO4 composite in 0.5 M hydrochloric acid without and with lanthanide chloride salt have been investigated. 10%ZrSiO4 was used for the production of the Al–4.5Cu/zircon sand composite. The time, temperature and concentration of inhibitor were varied in the range of 6–10 h at 2 h interval, 30–75 °C at 15 °C interval and 250–1000 ppm at 250 ppm interval respectively. Factorial design, standard deviation, effect of variables at 95% confidence interval and Arrhenius kinetics approach were used to correlate the corrosion parameter and corrosion rate. Results show that increase in temperature, inhibitor concentration above 250 ppm and decrease in time enhance corrosion rate. Also, temperature and anti-corrosion agent concentration are the most important control parameters. The kinetic and statistical approaches were in good agreement.