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Vol. 27, Special Issue, May 2014, pp. 305-311

 

Bullet

 

Effect of Ions Y+3 Inhibitor on Mild Steel Corrosion in 0.5 N NaCl Under Hydrostatic
and Hydrodynamic Regime
 

Sihem OUCHENANE, Sihem ABDERRAHMANE, Abdelaziz HIMOUR

Laboratoire d’Ingénierie des Surfaces (L. I. S.)-Université Badji Mokhtar, B. P. 12 -23000 Annaba, Algérie

E-mail: abderrahmanesihem@yahoo.fr

 

Received: 23 November 2013 /Accepted: 12 January 2014 /Published: 26 May 2014

Digital Sensors and Sensor Sysstems

 

Abstract: The corrosion inhibition of mild steel by Yttrium salt Y(NO3)3 6H2O at different concentrations in 0.5 N NaCl, has been carried out by potentiodynamic tests and electrochemical impedance spectroscopy (EIS).In ions Y+3 presence, the ions OH- formation at the interface (electrode / electrolyte ) by water and oxygen reduction ,precipitates oxide and hydroxyde composite in passive film. The current density decreases as a function of the inhibitor concentration; it varies from the value without inhibitor (i = 0.2139 m A /cm2) to the minimal value (i = 7.4.10-4m A/cm2) for 600 ppm concentration; the corresponding inhibitive efficiency reaches 99.65 %. On laminar hydrodynamic regime (w £ 3000 rpm), steel inhibition depends on rotation speed. It has been showed that passive film formation is all the more slowly than the rotation speed increases.

 

Keywords: Inhibitor, Yttrium, Rare earth, Corrosion, Hydrodynamic effect, EIS.

 

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