Présentation

Study of the electrochemical behavior of Al-Zn-In based sacrificial anodes in sea water

Numéro de la revue: Volume 29 , Numéro 1
Auteurs:

Ferkous1, A. Dilemi1, A. Abdennouri2,3, S.I.R Malha1

1Mechanical Engineering and Materials Laboratory. Department of Technology, Faculty of Technology. University August 20th, 1955 of Skikda.21000. Algeria.

2Laboratory of Physico-Chemistry of Surfaces and Interfaces, Department of Process Engineering, Faculty of Technology University August 20 th, 1955 of Skikda, BP 26, Route El Hadaik, 21000 Skikda, Algeria

3 Laboratoire de Catalyse Bioprocedés et environnement, Département de génie des procédés, Faculté de technologie Université 20 aout 1955 de Skikda, BP 26, Route El Hadaik, 21000 Skikda, Algerie.

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ABSTRACT

Cathodic protection is one of the most commonly used methods to protect steel structures immersed in seawater. This mode of protection may be used alone or associated with a coating, such as paint systems. This work aims to determine the durability of this protection system. We have studied the sacrificial nature of anodes made from Al-Zn alloy. The different materials used have been subjected to stationary and non-stationary electrochemical tests, especially electrochemical impedance spectroscopy (EIS), which is then characterized by EDX and SEM. In the case of sacrificial anodes, the results have highlighted the conditions of activation and passivation of these anodes, which are of particular industrial interest. A relationship has been established between the functioning of the studied anodes and the nature of the corrosion products.and revealing three areas of resistance and suggesting complex mechanisms for localized corrosion.

Keywords:

Sacrificial anodes, Al-Zn-In, Polarization, Impedance.