Inhibitory action of quaternary ammonium bromide on mild steel and synergistic effect with other halide ions in 0.5M H2SO4

Abstract

The corrosion inhibition of mild steel in 0.5 M H2SO4 solution has been investigated using electrochemical methods, X-ray diffraction (XRD) and scanning electron microscope (SEM). The adsorption and inhibition action of acid corrosion of mild steel using cetyltrimethylammonium bromide (CTABr) and different halides (NaCl, NaBr and NaI) has shown synergetic effect. The results showed that the protection efficiency (P%) has high values at considerable high concentration of CTABr. However, in the presence of the different halides, the P increases dramatically at low concentration of CTABr. Physisorption was proposed from the the values of ΔGads0. The synergism parameter (Sθ) is found to be greater than unity indicating that the enhanced P% caused by the addition of the halides to the CTABr is due to a co-operative adsorption of both species. Corrosion products phases and surface morphology were studied using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively.

Halogen-Free Functional Quaternary Ammonium-Based Ionic Liquid as an Ecofriendly Corrosion Inhibitor for Q235 Steel in Acids

“…As exhibited in Figure a and Table , the polarization curves in HCl solutions are parallel to each other with similar Tafel slopes, indicating that the addition of BTA-16-BTA does not change the mechanisms of hydrogen evolution or metal dissolution . Therefore, corrosion inhibition in HCl solution was simply achieved by blocking the iron surface . Therefore, the corrosion inhibition efficiency increased with an increasing concentration of inhibitor molecules.…”

“…26 Therefore, corrosion inhibition in HCl solution was simply achieved by blocking the iron surface. 27 Therefore, the corrosion inhibition efficiency increased with an increasing concentration of inhibitor molecules. The best anticorrosion performance (97.99%) was realized with 0.3 mM inhibitors.…”

Characterization of corrosion products formed on carbon steel in hydrochloric acid medium by 4-(dimethylamino)-1-(6-methoxy- 6-oxohexyl)pyridinium bromide

“…The cathodic Tafel lines show similar slope either in presence or absence of DMOPB. It indicates that the mechanism of the cathodic reaction does not change in presence of the inhibitor and the inhibition action is achieved by simple blocking of the iron surface [15,16]. The inhibitory efficacy of the DMOPB increases with the concentration and achieved maximum value of the order of 92% to 10 -3 M.…”

Principles and theories of green chemistry for corrosion science and engineering: design and application

“…The addition of the salt effectively elevated the ionic strength, which consequently reduced the electrostatic repulsion between the ionic heads of the surfactant and promoted its more significant adsorption on the steel surface. In a study by Khamis et al , 559 they investigated the corrosion inhibition of mild steel in a 0.5 M H 2 SO 4 solution using cetyltrimethylammonium bromide (CTAB) in combination with various salts (NaCl, NaBr, and NaI). Their findings revealed a synergistic effect in the adsorption and inhibition action against acid corrosion of mild steel when CTAB was combined with different halides.…”