Trifenylmethane compounds as copper corrosion inhibitors in hydrochloric acid solution

Abstract

Fuchsin basic (FB) and fuchsin acid (FA) were tested as new corrosion inhibitors for copper in 0.001, 0.005, and 0.01 M hydrochloric acid (HCI) solutions. Benzotriazole (BTA) was also tested for comparative purposes. Twelve FB, FA, and BTA concentrations, from 1 x 10-5 M to 1 x 10-1 M, were added to the acid solution at four temperatures ranging from 298 K to 328 K. Gravimetric measurements were performed after 3 h experimentation. The order of inhibition efficiency was FB - BTA > FA. The Frumkin isotherm gave the best fit to the experimental results. The projected molecular area was used to elucidate inhibitor orientation in the adsorption process.