Aminoethanesulfonic Acid- Based Blends for Inhibition of J55 Steel Corrosion in Simulated Oilfield Pickling Fluid

As industries are more interested in patronizing non-toxic and ecofriendly inhibitors to preserve environment, two binary and a ternary blend have been formulated from 2-aminoethanesulphonic acid (2ASA) and some synergistic intensifiers. The blends have been demonstrated as efficient corrosion inhibitors in simulated pickling fluid for protection of J55 steel materials used in oilfield. Small concentration (10-3 M) of the base compound, 2ASA, was 96.4% efficient at 30 oC but far less efficient at high temperature (90 oC). Due to synergistic effects of the compounds used to formulate the blends, it was possible to record efficiency up to 87.8% at 90 oC for one of the blends containing potassium iodide (KI) and dipotassium hydrogen phosphate (DPHP). Adsorption of 2ASA molecules was spontaneous, exothermic and involves monolayer of physisorbed molecules on J55 steel surface as best approximated by Langmuir adsorption model. Tafel measurements confirm that 2ASA behaves as mixed type inhibitor with domino inhibitive influence on anodic half reaction. FTIR and EDAX studies confirm that adsorption of 2ASA is facilitated by N, S, and O functionalities. Formation of surface adsorbed 2ASA film was visibly observed via scanning electron microscopy (SEM). Inhibition efficiencies of 2ASA were determined by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) techniques and results were consistent and comparable. 2ASA and its blends could find application as alternative ecofriendly corrosion inhibitors for pickling and similar acidizing operations in the oilfield.