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Effect of bismuth (III) chloride on the dealloying of Cu binary alloys in acid solution: Dezincification

A.A.El Warraky, A.E.El Meleigy, M.F.Shehata

The inhibition effect of 70-30 brass using inorganic bismuth (III) Chloride (BiCl3) in 0.1MHCl at 30?C has been assessed byTafel plots, potentiostatic polarization and scanning electronmicroscopy (SEM). The addition of very low concentrations of BiCl3 decreased the cathodic current only which indicate that BiCl3 behaves as cathodic inhibitor. The decrease in the corrosion rate beside the high efficiency achievementwhich reached up to 97.3% was attributed to the deposition of Bi metal at zinc locations on the alloy surface. This deposited film is highly persistence as examined in an acid solution without inhibitor by potentiostatic polarizationmeasurements and consequently its suppress the selective leaching of zinc from the alloy surface.