, Volume 10, Issue 4, pp 445–458 | Cite as

Inhibition of Aluminium Corrosion Using Benzothiazole and Its Phthalocyanine Derivative

  • Nnaemeka Nnaji
  • Njemuwa Nwaji
  • Gertrude Fomo
  • John Mack
  • Tebello NyokongEmail author
Original Research


Cyclic voltammetry and potentiodynamic polarization techniques were used to study the effects of 4-[4-(1,3-benzothiazol-2yl)phenoxy] phthalonitrile (BT) and tetrakis[(benzo[d]thiazol-2ylphenoxy) phthalocyaninato] gallium(III)chloride (ClGaBTPc) as aluminium corrosion inhibitors in 1.0 M hydrochloric acid. The presence of the inhibitors in the concentration range of 2 to 10 μM was found to retard the aluminium corrosion process such that the inhibition efficiency was found to range from 28.2 to 76.1% for BT and from 71.5 to 82.7% for ClGaBTPc. The latter was a better inhibitor. Scanning electron microscopy and energy-dispersive X-ray measurements reveal effective metal surface protection by the inhibitors, most probably by shielding it from the corrosion attacks of Cl from the acid. The calculated quantum chemical parameters agreed with experimental results.

Graphical Abstract

Adsorption of benzothiazole phthalocyanine onto the metal surface for the protection of the metal from the aggressive attack of Cl.


Aluminium Benzothiazole Corrosion inhibition Cyclic voltammetry Potentiodynamic polarization 



This work was supported by the Department of Science and Technology (DST) and National Research Foundation (NRF), South Africa, through the DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology (UID 62620) as well as the Rhodes University/DST Centre for Nanotechnology Innovation, South Africa.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

12678_2019_538_MOESM1_ESM.docx (2.2 mb)
ESM 1 (DOCX 2246 kb)


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Authors and Affiliations

  1. 1.Institute for Nanotechnology Innovation, Department of ChemistryRhodes UniversityGrahamstownSouth Africa

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