Evaluation of an Imidazoline in Simulated Atmospheric Conditions as Corrosion Inhibitor through Electrochemical Noise

This work presents electrochemical noise measurement results from assessment of  2-methyl-2-imidazoline as inhibitor on a 1018 steel, at different relative humidity, categorized according to ASTM E 104 85.

A modified steel plates atmospheric corrosion probe (MECA) was used in order to measure potential and current noise time series; by using MECA, atmospheric corrosion rate could be determined, even if humidity was low.

Imidazoline is widely used in petrochemical industry as a corrosion inhibitor, so that was the reason for studying the behavior of this inhibitor in other corrosive processes as in the packaging or protection of metals exposed to atmosphere.

Spectral and statistical analysis of the noise data was carried out; after that, polarization curves were conducted to validate the information from noise and the use of MECA monitor. From the results, it was established that 2-methyl-2 imidazoline decreasing anodic potential and modifies the double layer adsorption.

The use of MECA monitor was validated, founding that records were reliable for electrochemical measurements of atmospheric corrosion.