Water chemistry had substantial effects on dezincification propensity in systems
where brass is galvanically connected to copper. It is observed that pH, chloride,
alkalinity and sulfate are all influential parameters with respect to the extent of
dezincification. A pH range from 6 to 10 was tested. Both zinc and copper were
leached most rapidly at low pH; however, selective leaching of zinc is highest around
pH 8. Water higher in chloride or sulfate is more aggressive to brass, and the effects of
chloride are more significant than sulfate. Finally, the conventional theory of
"meringue" dezincification suggests that waters low in temporary hardness will have
higher dezincification propensity. Results of this experiment demonstrate that low
hardness, or even softened waters, is not necessarily more aggressive than un-softened
waters. Rather, it appears that higher alkalinity dramatically decreases dezincification. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 8.8 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 14 |
| Published : | 11/01/2009 |
