Investigating the Anodic Formation of Oxides on Cold Spray Copper in De-Aerated NaOH Solution

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Xinran Pan
Jian Chen
Mehran Behazin
Christina Lilja
David W. Shoesmith
James J. Noël

Abstract

The anodic formation of copper oxides on cold sprayed copper (CS-Cu) in de-aerated 0.1 M NaOH solution was investigated using potentiostatic polarization, cathodic stripping voltammetry, Raman spectroscopy, and field emission scanning electron microscopy. The surface analytical results showed that a thin, porous oxide layer consisting of Cu2O and Cu(OH)2 was formed on the CS-Cu surface when it was anodically polarized at -0.3 VSCE, consistent with cathodic stripping voltammetry results that the oxides grown on the CS-Cu surface yielded two distinct reduction peaks. These two peaks were attributed to the reduction of (1) Cu2O formed by the anodic oxidation of Cu and (2) Cu(OH)2 present or formed at the CS-Cu particle-particle interfaces.

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