Electrochemical behaviour of lead in hydrochloric acid solution in the presence of inorganic ions

الموضوعات : Journal of the Iranian Chemical Research

Belkheir Hammouti ¹ (Laboratoire de Chimie Appliquée et Environnement, Faculté des Sciences, Université Mohammed Premier, B.P. 717, 60 000 Oujda,Morocco)
Rachid Salghi ² (Laboratoire d'Ingénierie des Procédés de l’Energie et de l’Environnement, Equipe Génie de l’Environnement et de Biotechnologie, Ecole National des Sciences Appliquées, BP 1136, Agadir,)
Mohammed Mihit ³ (Laboratoire Matériaux & Environnement, Equipe de Chimie Physique Appliquées, Faculté des Sciences, BP 8106, Agadir - Morocco)
Lahcen Bazzi ⁴ (Laboratoire Matériaux & Environnement, Equipe de Chimie Physique Appliquées, Faculté des Sciences, BP 8106, Agadir - Morocco)

تاريخ الإرسال : 07 الأحد , محرم, 1430 تاريخ التأكيد : 09 الأحد , رمضان, 1430 تاريخ الإصدار : 01 الأحد , شوال, 1430

الکلمات المفتاحية: Corrosion, Lead, Oxo-anions, Hydrochloride acid, Cyclic voltammetry,

ملخص المقالة :

The electrochemical behaviour of lead electrode in hydrochloride solution containing variousoxo-anions at different concentrations was studied by using of cyclic voltammetry (CV) method.Results obtained show that the addition of these inorganic compounds decreases the anodic andcathodic currents peaks according to the following order: H2PO4- > HPO42-> SO42-. It’s revealedalso that the cathodic current density related to the reduction of Pb2+ ions dissolved in solutiondecreases with the oxo-anions concentration. When the addition of sulphates ions concentrationreaches 0.34 mol L-1, the formation of PbSO4 is highly favoured. Therefore, the intersticesbetween the crystals of PbSO4 encourage the dissolution of lead and the formation of insolublePbCl2 layer on the lead surface involving the passivation phenomenon.

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