Please use this identifier to cite or link to this item:
http://nopr.niscpr.res.in/handle/123456789/30815| Title: | Effect of oxygen and oxidizers on the electrochemical behaviour of a-brass in aqueous solutions of different pH |
| Authors: | AI-Kharafi, F M Badawy, W A |
| Issue Date: | Jan-1998 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The electrochemical
behaviour of a-brass (Cu:Zn ≈ 70:30) in naturally aerated, oxygen saturated and
oxygen free acidic, neutral and basic solutions of constant pH has been investigated. The effect of
oxygen and oxidizers on the corrosion behaviour of the alloy in the different
solutions has been discussed. The effect of oxygen or oxidizers on the
corrosion parameters of the alloy is dependent on the solution pH. The removal of oxygen or oxidizers
from acidic solutions increases the corrosion resistance of the alloy. In these
solutions, the presence of oxygen or oxidizers enhances disproportionation
reactions which lead to the breakdown of the passive film formed on the alloy
surface. The preferential dissolution of zinc has been found to destroy the
passive film, especially in acidic solutions. X-ray photoelectron spectroscopic
investigations (XPS) of the alloy surface after long immersion time in
solutions containing Cr2O ions have shown that chromium is not
incorporated in the barrier film. Scanning electron microscopy (SEM) does not
show remarkable difference between the polished surface and the surface after
immersion in the test solutions. In-acidic solutions containing dichromate ions
increased corrosion rates have been measured and clear corrosion patterns in
the scanning electron micrographs have been recorded. |
| Page(s): | 29-34 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Appears in Collections: | IJCT Vol.05(1) [January 1998] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCT 5(1) 29-34.pdf | 1.01 MB | Adobe PDF | View/Open |
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