Yakubov U.Sh., Ganiev I.N., Sangov M.M., Ganieva N.I. On the corrosion potential of AlFe5S10 alloy inoculated with alkaline-earth metals in the NaCl medium

Abstract

This paper describes a potentiostatic study of the anodic behaviour of the AlFe5S10 alloy with calcium, strontium and barium conducted in the potentiodynamic mode at a potential sweep rate of 2 mV/s. It is shown that as the concentration of the alkaline-earth metal rises, the free corrosion potential (or, steady state potential) of the AlFe5S10-Ca (Sr, Ba) alloys tends to change in the positive direction. At the same time, influenced by the concentration of chloride ion in the NaCl medium, it tends to move in the negative direction of the coordinate axis. As the concentration of chloride ion in the NaCl electrolyte rises, the pitting and repassivation potentials of the AlFe5S10 alloy with calcium, strontium and barium drop. An increased concentration of the inoculant in the AlFe5S10 alloy leads to higher pitting and repassivation potentials in either medium regardless of the chloride ion concentration. The more calcium, strontium and barium are inoculated, the lower the corrosion current density and, correspondingly, the corrosion rate of the AlFe5S10-Ca (Sr, Ba) alloy get. The chloride ion concentration causes the corrosion current to rise. This dependence is typical of all alloys regardless of their composition or the physical and chemical properties of the inoculant.

Keywords

AlFe5S10 alloy, calcium, strontium, barium, potentiostatic method, electrochemical corrosion, anodic behaviour, corrosion potential, corrosion rate.

Umarali Sh. Yakubov – Postgraduate Student

V.I. Nikitin Institute of Chemistry, Academy of Sciences of the Republic of Tajikistan, E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Izatullo N. Ganiev – DSc (Chemistry), Professor, Head of Laboratory

V.I. Nikitin Institute of Chemistry, Academy of Sciences of the Republic of Tajikistan, Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Murodali M. Sangov – Rector

Tajik State Pedagogical University. Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Nargis I. Ganieva – Associate Professor

Tajik Technikal University named after academic M.S. Osimi. Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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