The rate of diffusion-controlled electrochemical corrosion at gas-evolving cylinders

The effect of oxygen evolution on the rate of anodic dissolution of copper cylinders in orthophosphoric acid (H 3PO 4) was studied. The variables investigated were the oxygen discharge rate, the H 3PO 4 concentration and the cylinder position. The mass transfer coefficient of copper dissolution was...

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Veröffentlicht in:Surface technology 1980-01, Vol.11 (1), p.61-66
Hauptverfasser: Sedahmed, G.H., Zatout, A.A., Mansour, I.A.S., Abdel-Hay, N.A.
Format: Artikel
Sprache:eng
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Zusammenfassung:The effect of oxygen evolution on the rate of anodic dissolution of copper cylinders in orthophosphoric acid (H 3PO 4) was studied. The variables investigated were the oxygen discharge rate, the H 3PO 4 concentration and the cylinder position. The mass transfer coefficient of copper dissolution was related to the oxygen discharge rate by the equations K = aV 0.19 for vertical cylinders and K = aV 0.233 for horizontal cylinders. Mass transfer coefficients at horizontal cylinders were found to be higher than those at vertical cylinders. The rate of dissolution and the mass transfer coefficient were found to increase with decreasing H 3PO 4 concentration.
ISSN:0376-4583
DOI:10.1016/0376-4583(80)90019-9