Abstract
Tetrakis[(benzo[d]thiazol-2-yl-thio) phthalocyaninato] gallium(III)chloride (1) and tetrakis[(benzo[d]thiazol-2ylphenoxy) phthalocyaninato] gallium(III)chloride (2) were successfully electrodeposited onto aluminium for corrosion retardation in 1.0 M hydrochloric acid solution. The aim of this study was to compare the corrosion resistance of electrodeposited metallated phthalocyanines. Scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy (EIS), and polarization confirmed the aluminium corrosion inhibition potentials of complexes 1 and 2. EIS and polarization techniques showed that complex 2 performed better than complex 1, with values from EIS measurements of 82% for 1 and 86% for 2 in 1.0 M hydrochloric acid solution. The importance of electrodeposition in industries and a dearth of research on the use of electrodeposited metallated phthalocyanines necessitated this study, and results show that coatings formed by electrodeposition of 1 and 2 onto aluminium reduced its susceptibility to corrosion attack.
Highlights
Is study reports for the first time the transition dipole moment (μe) and oscillator strength (f ) of complexes 1 and 2 (structure in Figure 1) from which corrosion inhibition abilities of 1 and 2 were determined
Introduction e strong electron delocalization property of metallophthalocyanines (MPcs) allow them to be used in many applications such as in nonlinear optics, dye-sensitized solar cells (DSSC), and photocatalysis and as gas sensors [1,2,3,4]
Organic molecules with π-electron systems in combination with substituents containing heteroatoms such O, N, and S are potential corrosion inhibitors due to their ability to adsorb on metallic surface [6, 7]. is work combines phthalocyanines with benzothiazole for synergetic corrosion inhibition and reports for the first time on the electrodeposition of phthalocyanines prior to corrosion control, as opposed to adsorption during corrosion inhibition
Summary
Is study reports for the first time the transition dipole moment (μe) and oscillator strength (f ) of complexes 1 and 2 (structure in Figure 1) from which corrosion inhibition abilities of 1 and 2 were determined. Oscillator strength is related to dipole moment, and it is employed in this work to determine the possible corrosion inhibition efficiencies of complexes 1 and 2 in different solvents.
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