Corrosion and Inhibition Effects of Mild Steel in Hydrochloric Acid Solutions Containing Organophosphonic Acid

Abstract EN

A study has been made on the mechanism of corrosion of mild steel and the effect of nitrilo trimethylene phosphonic (NTMP) acid as a corrosion inhibitor in acidic medium, that is, 10% HC1 using the weight loss method and electrochemical techniques, that is, potentiodynamic and galvanostatic polarization measurements.

Although corrosion is a long-time process, but it takes place at a faster rate in the beginning which goes on decreasing with due course of time.

The above-mentioned methods of corrosion rate determination furnish an average value for a long-time interval.

Looking at the versatility and minimum detection limit of the voltammetric method, the authors have developed a new voltammetric method for the determination of corrosion rate at short-time intervals.

The results of corrosion of mild steel in 10% HC1 solution with and without NTMP inhibitor at short-time intervals have been reported.

The corrosion inhibition efficiency of NTMP is 93% after 24 h.