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The Corrosion Inhibition Effect of Cerium (III) Ions for X70 Steel in 3% NaCl Medium


Affiliations
1 Laboratoire physico-chimie des Matériaux (LPCM), Université Amar Telidji BP 37G 03000 Laghouat, Algeria
2 Plateaux Techniques D'analyses Physico-Chimiques (PTAPC) CRAPC Laghouat 03000, Algeria
 

The inhibition of the corrosion of X70 steel in aerated 3% NaCl solutions by cerium (III) nitrate hexahydrate has been studied using polarization method, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results indicated that the protection efficiency (%IE) rises with an increase in the concentration of Ce (III) and reached an optimal value of 72%. The results of EIS show that when the concentration of the inhibitor increases, both charge transfer resistance and inhibition efficiency tend to increase while the value of constant phase element, CPE, tends to decrease. SEM analysis was performed to study the persistence of the Ce(III) hydroxide layer.

Keywords

X70 Steel, Corrosion, Inhibition, Ce(III) Ions.
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  • The Corrosion Inhibition Effect of Cerium (III) Ions for X70 Steel in 3% NaCl Medium

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Authors

HAMDI Ahmed
Laboratoire physico-chimie des Matériaux (LPCM), Université Amar Telidji BP 37G 03000 Laghouat, Algeria
BOULERBA Djilali
Plateaux Techniques D'analyses Physico-Chimiques (PTAPC) CRAPC Laghouat 03000, Algeria

Abstract


The inhibition of the corrosion of X70 steel in aerated 3% NaCl solutions by cerium (III) nitrate hexahydrate has been studied using polarization method, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results indicated that the protection efficiency (%IE) rises with an increase in the concentration of Ce (III) and reached an optimal value of 72%. The results of EIS show that when the concentration of the inhibitor increases, both charge transfer resistance and inhibition efficiency tend to increase while the value of constant phase element, CPE, tends to decrease. SEM analysis was performed to study the persistence of the Ce(III) hydroxide layer.

Keywords


X70 Steel, Corrosion, Inhibition, Ce(III) Ions.

References