Corrosion Resistance of Aluminum against Acid Activation: Impact of Benzothiazole-Substituted Gallium Phthalocyanine

Abstract

This study describes the adsorption behavior of organic inhibitors at the aluminum-HCl solution interface and their corrosion inhibition performance. The organic inhibitors employed are: 4-(benzo [d]thiazol-2ylthio)phthalonitrile (BTThio) and tetrakis[(benzo[d]thiazol-2-yl-thio)phthalo- cyaninato]gallium(III) chloride (ClGaBTThioPc). The corrosion behavior of these inhibitors is investigated using electrochemical and computational techniques. Open circuit potential results reveal predominant cathodic character for the mechanism of aluminum corrosion inhibition by the inhibitors. Inhibition efficiency values from potentiodynamic polarization measurements increase from 46.9 to 70.8% for BTThio and 59.7 to 81.0% for ClGaBTThioPc within the concentration range of 2 to 10 μM. Scanning electron microscopy (SEM) measurements reveal protection of the metal surface from acid attack, in the presence of the inhibitors and energy dispersive X-ray (EDX) measurements show that the most probable way by which the inhibitors protect the metal surface would be by shielding it from the corrosion attacks of Cl− from the acid. Quantum chemical parameters corroborate well with experimental findings.

Ammonium Phosphate as Inhibitor to Mitigate the Corrosion of Steel Rebar in Chloride Contaminated Concrete Pore Solution

“…The negative value of indicates the spontaneous adsorption and stability of the adsorbed film onto the steel rebar surface. The calculated by the Langmuir adsorption isotherm indicates that the ammonium phosphate monobasic inhibitor follows the physisorption and chemisorption together [ 54 , 55 , 56 , 57 ] while the Freundlich result suggests the physisorption isotherm [ 58 ].…”

2‐hydroxyethilammonium oleate protic ionic liquid as corrosion inhibitor for aluminum in neutral medium

“…This phenomenon could take place by the reaction between the PIL and the chloride anions, as reported in other works. [ 21,67 ] The cation moiety of the PIL could be electrostatically attracted toward the chloride anions, through the amino functional group, [ 21,68 ] which retarded their arrival toward the surface. On the contrary, the counterion corresponding to the oleate anion could have been chemisorbed on the substrate surface, given that, at the studied pH, aluminum possesses an excess of positive charge.…”

Biferrocenyl Schiff bases as efficient corrosion inhibitors for an aluminium alloy in HCl solution: a combined experimental and theoretical study

“…Finally, we have observed that the cp rings peak intensities also became lowered upon adsorption on the aluminium surface. 53 A comparison of the FT-IR spectra of Fcub and Fcuc before and aer adsorption on the aluminium alloy surface are shown in Fig. S10 and S11.…”