The Open Materials Science Journal


ISSN: 1874-088X ― Volume 13, 2019

Corrosion Inhibition of Mild Steel in 1.0 M HCl Solution by Anhydrous Tricalcium Phosphate

L. Chafki1, E.H. Rifi1, R. Touir2, 3, *, M. Ebn Touhami2, Z. Hatim4
1 Laboratory of Organic Synthesis and Process d’Extraction, Faculty of Science, University Ibn Tofail, Kenitra, Morocco
2 Laboratory of Materials Engineering and Environment: Modeling and Application, Faculty of Science, University Ibn Tofail BP. 133-14000, Kenitra, Morocco
3 Centre Régional des Métiers de l’Education et de la Formation (CRMEF), Avenue Allal Al Fassi, Madinat Al Irfane, BP 6210 Rabat, Morocco
4 Laboratory of Electrochemistry and Surface Treatment, Faculty of Sciences, El Jadida, Morocco



In this study, electrochemical measurements were used to characterize Anhydrous Tricalcium Phosphate (ATP) as a corrosion inhibitor for mild steel in 1.0 M HCl.


The potentiodynamic polarization curves indicated that the ATP reacts as an anodic type inhibitor. In addition, it has been found that the electrochemical impedance confirms the inhibitor character of ATP obtained by the potentiodynamic polarization curves where the inhibition efficiency increases by its concentration to reach a maximum of 93.79 % at 10-4 M. The temperature solution influence indicated that the corrosion rate increases with temperature while the inhibitor acts actively. Thermodynamic adsorption and activation parameters indicated that the ATP acts by physical adsorption on the metallic surface with an endothermic process of metal dissolution.


Additionally, it was found that the adsorption of ATP molecules obeyed to the Langmuir isotherm. Surface analyses via scanning electron microscopy (SEM) was used to investigate the morphology of mild steel before and after immersion in 1.0 M HCl solution without and with 10-4 M of ATP. It is revealed that the ATP  acted by the formation of a protective layer on the mild steel.

Keywords: Anhydrous tricalcium phosphate, Corrosion inhibition, Mild steel, Hydrochlorid acid, Electrochemical measurements, SEM analysis.

Article Information

Identifiers and Pagination:

Year: 2018
Volume: 12
First Page: 68
Last Page: 81
Publisher Id: TOMSJ-12-68
DOI: 10.2174/1874088X01812010068

Article History:

Received Date: 25/4/2018
Revision Received Date: 13/06/2018
Acceptance Date: 20/06/2018
Electronic publication date: 31/07/2018
Collection year: 2018

© 2018 Chafki et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address for correspondence to this auther at the Laboratory of Materials Engineering and Environment: Modeling and Application, Faculty of Science, University Ibn Tofail BP. 133-14000, Kenitra, Morocco, E-mails:;

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