Inhibitive Effect of Fatty Amide and Secondary Species on the Corrosion of Carbon Steel

Abstract

The effect of hydrazine, N2H4 in the presence of fatty amide as corrosion inhibitor on corrosion of carbon steel in 3.5 wt% NaCl solution was studied by linear polarization resistance method (LPRM) at room temperature and static condition. The specimens’ surface analysis was done using atomic force microscope (AFM). The inhibition efficiency improved to more than 80% when 500, 100 and 2000 ppm of hydrazine were added to the inhibited solution containing 20 ppm fatty amide. The results obtained show that the inhibition effect is increased with increase of hydrazine concentration in inhibited solution. It indicates that hydrazine retards the reduction of oxygen in the corrosion process by reacting with dissolved oxygen in the solution and thus, further it reduces the corrosion rate of carbon steel.

Reaction Products of Crude Palm Oil-based Fatty Acids and Monoethanolamine as Corrosion Inhibitors of Carbon Steel

“…Optimum efficiency was obtained at concentration 80 ppm with an %IE value of 88% [16]. The mechanism of inhibition probably involved the formation of a protective layer using the interaction between the free electron pairs from the oxygen and nitrogen atoms of the fatty esters and amides via coordination bond, thus preventing the corrosion reaction between metal and oxygen [12,[17][18].…”