This work evaluates the suitability of lignin as corrosion inhibitor when AISI 1080 carbon steel coupons were used as tests specimens. A stock solution of lignin powder provided by an Albertan Pulp and Paper mill company was tested for its inhibition efficiency in Rotating Cylinder Electrode (RCE) system according to ASTM G185-06. The testing environment consisted on modelled brackish water at temperatures varying between 30°C - 85°C and pH=6 to 8.The corrosion rates of the test specimens calculated by both linear polarization resistance (LPR) and weight loss methods indicated optimum lignin performance was achieved for all range of temperature tested when pH=6. For this case the lignin based solution reduced the corrosion rate by more than 90% compared to the baseline corrosion rate measurement.The corrosion potential of the baseline test specimens were < -700 mV (more negative) and became more positive after lignin was added to the model brackish water system indicating corrosion severity of the test medium in the absence of this bio-based inhibitor. Optical imaging of the corrosion coupons after all tests showed no significant general corrosion and pitting in those test conditions compared to the baseline specimens.This work evaluates the suitability of lignin as corrosion inhibitor when AISI 1080 carbon steel coupons were used as tests specimens. A stock solution of lignin powder provided by an Albertan Pulp and Paper mill company was tested for its inhibition efficiency in Rotating Cylinder Electrode (RCE) system according to ASTM G185-06. The testing environment consisted on modelled brackish water at temperatures varying between 30°C - 85°C and pH=6 to 8.The corrosion rates of the test specimens calculated by both linear polarization resistance (LPR) and weight loss methods indicated optimum lignin performance was achieved for all range of temperature tested when pH=6. For this case the lignin based solution reduced the corrosion rate by more than 90% compared to the baseline corrosion rate measurement.The corrosion potential of the baseline test specimens were < -700 mV (more negative) and became more positive after lignin was added to the model brackish water system indicating corrosion severity of the test medium in the absence of this bio-based inhibitor. Optical imaging of the corrosion coupons after all tests showed no significant general corrosion and pitting in those test conditions compared to the baseline specimens.