Metall. Res. Technol.
Volume 118, Number 2, 2021
|Number of page(s)||9|
|Published online||15 March 2021|
Study of the influence of dithizone as an eco-friendly corrosion inhibitor on the corrosion behaviour of AA7075 aluminium alloy in neutral chloride solution
Laboratoire des interactions matériaux environnement (LIME), University of Mohamed Seddik Benyahia,
Ouled Aïssa, BP 98,
2 Laboratoire d’energétique appliquée et matériaux (LEAM), Université of Mohamed Seddik Benyahia, Ouled Aïssa, BP 98, Jijel 18000, Algeria
3 Università di Palermo, Dipartimento di Ingegneria, Viale delle Scienze, Ed. 6, Palermo, Italy
* e-mail: firstname.lastname@example.org
Accepted: 13 January 2021
The effect of 1,5-diphenylthiocarbazone (dithizone) as an eco-friendly corrosion inhibitor for protection of AA7075 aluminium alloy in chloride containing aggressive environment was studied by means of weight-loss, electrochemical measurements and Raman spectroscopy. The results indicate that the addition of dithizone decreases significantly the corrosion rate of AA7075 alloy, with efficiency proportional to the inhibitor concentration. The polarization curves show that dithizone works as mixed-type inhibitor to slow down the anodic and cathodic reaction kinetic. The morphology revealed by scanning electron microscopy and the Raman spectroscopy analysis clearly shows that the inhibitor contributes in the formation of a stable protective film on the AA7075 alloy due to the adsorption of dithizone molecules on aluminium alloy surface obeying Langmuir adsorption isotherm.
Key words: aluminium / inhibitors / dithizone / impedance spectroscopy / Raman spectroscopy
© EDP Sciences, 2021
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