Comparative Study of the Effect of Imidazole and Triethylentetramine on the Corrosion Behavior of API-5L-X65 Steel in 1M HCl Environment

This research focused on studying the corrosion behavior of API-5L-X65 steel in acidic environment (1M HCl) containing Triethylenetetramine (TETA) and Imidazole (IMI) corrosion inhibitors. Corrosion rate of the API steel coupons were evaluated in 1M HCl at room temperature using both gravimetric and Potentiodynamics polarization techniques. The corroded steel in the HCl was characterized using optical microscope and atomic absorption spectrometer. The result revealed that with increase in volume of the IMI and TETA compounds, there was a proportionate decrease in the rate at which the API steel corrodes in the acidic environment. Also, corrosion rate of 6.0748E-09 mm/yr and 7.0417E-09 mm/yr were observed for the steel sample in 50 ml IMI and 50 ml TETA, respectively. Maximum corrosion efficiency of 89.28% and 87.58% were obtained for 50 ml IMI and 50 ml TETA, respectively. The morphology of the corroded steel surface revealed that IMI adsorbs more than the TETA inhibitor.