Influence of some Thiophene Derivatives on the Corrosion of Iron in Nitric Acid Solution

Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt Manuscript received 7 February 1985, accepted 17 January 1986 Corrosion of Iron in 2M HNO3 has been studied by the electrochemical polarisation and weight-loss measurement. The effect of some thiophene derivatives has been investi-gated. The results show that the inhibitors under consideration, lnfluence both the cathodic and anodic processes, and are adsorbed on the metal surface in molecular form. They do not change the mechanism of the reaction between iron and nitric acid but decrease its rate. This effect is controlled by the values of their dipole moments. Weight-loss technique also gives the same order of inhibition efficiency of the tested inhibitors