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.
Highlights
Aluminum is widely used as a material in automobiles, aviation, household appliances, containers, and electronic devices [1,2]
Open circuit potential values of aluminum corrosion in the presence of the suggest predominantly cathodic character with higher corrosion efficiency for ClGaBTThioPc compared to BTThio due to the higher π conjugation in the former
Electrochemical impedance spectroscopy confirmed that BTThio and ClGaBTThioPc inhibit the corrosion rate of aluminum by an adsorption mechanism
Summary
Aluminum is widely used as a material in automobiles, aviation, household appliances, containers, and electronic devices [1,2]. BTThio was involved in the synthesis of ClGaBTThioPc, it is expected that corrosion inhibition would be 2018, enhanced inREVIEW the latter due to the π-conjugated electron rich Pc. 23, x FOR PEER of 23 to which benzothiazole containing N and S in their structures are substituted. This work provides proof that the extend of π conjugation affects corrosion inhibition Enhances their ability to adsorb onto the metal surface and have been exploited for corrosion the uses of phthalonitrile derivatives potential sources ofcorrosion developing corrosion inhibitors are under inhibition purposes [18,19,20,21].asThis work reports on the inhibition of the phthalocyanine with benzothiazole (BTThio) when compared to the latter alone.
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