Corrosion inhibition properties of the synergistic effect of 4-hydroxy-3-methoxybenzaldehyde and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions

• Main Authors: Roland T. Loto, Olukeye Tobilola
• Format: Article
• Language: English
• Published: Elsevier 2018-10-01
• Series: Journal of King Saud University: Engineering Sciences
• Online Access: http://www.sciencedirect.com/science/article/pii/S1018363916300411

The synergistic effect of the corrosion inhibition behaviour of 4-hydroxy-3-methoxybenzaldehyde and hexadecyltrimethylammoniumbromide on mild steel in 0.5 M H2SO4 and HCl acid test solutions was studied through weight loss measurement and potentiodynamic polarization test. Results show the admixture performed effectively in both acids with inhibition efficiency above 90% in H2SO4 and 80% in HCl acid at all inhibitor concentrations from both tests. Thermodynamic calculations showed the compound chemically adsorbed onto the steel surface forming a protective film. Molecular adsorption followed the Langmuir and Frumkin isotherm models. Keywords: Inhibitor, Acid, Corrosion, Mild steel