Corrosion inhibition of steel by 1‐phenyl 5‐mercapto 1,2,3,4‐ tetrazole in acidic environments (0.5 M H₂SO₄ and 1/3 M H₃PO₄)

Abstract

1‐phenyl 5‐mercarpto 1,2,3,4‐tetrazole (PMT) was tested as an inhibitor for the corrosion of steel in 0.5 M H 2 SO 4 and 1/3 M H 3 PO 4 by weight‐loss and electrochemical methods. Results obtained showed that the inhibition efficiency of PMT increased with the increase of inhibitor concentration and reached an optimum value (98 per cent) at 10 −3 M in H 2 SO 4 and H 3 PO 4 solutions. The effect of the temperature on the kinetic parameters of corrosion of steel in the aqueous solutions of H 2 SO 4 and H 3 PO 4 with and without addition of PMT has been studied and the associated parameters were determined.