The suitability of a bio-based corrosion inhibitor developed by InnoTech Alberta Inc. was tested using AISI 1080 carbon steel coupons as tests specimens immersed in modelled brackish water.
Said bio-based solution was tested for its inhibition efficiency in Rotating Cylinder Electrode (RCE) system according to ASTM G185-06. The corrosion rates of the test specimens calculated by both linear polarization resistance (LPR) and weight loss methods indicated the bio-based solution reduced the corrosion rate by more than 90% compared to the baseline corrosion rate measurements at near neutral pH. The corrosion potential of the baseline test specimens were < -700 mV (more negative) and became more positive when the bio-based inhibitor was added to the model brackish water system, indicating corrosion severity of the test medium in the absence of bio-based inhibitor. Optical imaging of the corrosion coupons after test showed no significant general corrosion and pitting in those test conditions where the inhibiting solution was used compared to the baseline specimens.