Nicotinic acid as an inhibitor for corrosion of mild steel in hydrochloric acid solutions Available to Purchase

The inhibition of the corrosion of mild steel in hydrochloric acid has been studied with nicotinic acid. The effect of acid and inhibitor concentrations, as well as of the immersion period, has shown that the efficiency of the inhibitor is in the range 43–93%. Polarisation studies indicate that the anode polarisation is less than that on the cathode side and both are increased significantly by the inhibitor. The Tafel plot holds good in this case. The dissolution of the metal is electro‐chemical in character, and it is possible to obtain cathodic protection by impressed current. The inhibitor efficiencies have been calculated from cathode potential data. The corrosion process with this inhibitor appears to be under mixed control.