Open AccessProtection performance of orange oil distillates on low carbon steel in dilute acid electrolytes
Author(s) -
Roland Tolulope Loto,
Ekene Henry Mbah,
Jennifer Iruoma Ugada
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1036/1/012048
Subject(s) - carbon steel , electrolyte , corrosion , open circuit voltage , electrochemistry , orange (colour) , chemistry , aqueous solution , distillation , materials science , inorganic chemistry , electrode , metallurgy , chromatography , voltage , organic chemistry , physics , food science , quantum mechanics
Orange essential oil distillate (OOE) was studied for its inhibition performance on low carbon steel in 0.5 M H 2 SO 4 and HCl aqueous electrolyte by electrochemical method and open circuit potential measurement. OOE performance was significantly proportional to it concentration with highest protection efficiency of 76.93% and 94.90% at optimal OOE concentration (10% OOE) in H 2 SO 4 and HCl electrolyte. The performance of OOE at low concentration in H 2 SO 4 was quite poor with inhibition efficiency values below 40%. OOE exhibited greater inhibition action in HCl solution with effective performance beginning at 4% OOE concentration compared to 6% concentration in H 2 SO 4 electrolyte. Corrosion potential deviated basically in the anodic direction signifying the dominant inhibition effect to be through surface coverage of the steel surface. OOE exhibited mixed type corrosion inhibition. Open circuit potential graphs show OOE increases the thermodynamic fluctuation of the carbon steel in H 2 SO 4 solution relative to the plots at 0% OOE, despite effective protection. In HCl, the open circuit potential plots were more electropositive relative to the plots at 0% OOE signifying decreased tendency to corrosion. Optical images of the carbon steel after evaluation with and without OOE significantly contrast each other.