| Issue |
Matériaux & Techniques
Volume 78, Number 1-2, 1990
|
|
|---|---|---|
| Page(s) | 29 - 33 | |
| DOI | https://doi.org/10.1051/mattech/199078010029 | |
| Published online | 13 April 2017 | |
Croissance épitaxique du carbonate de calcium sur les brasures cuivre-phosphore dans l’eau sanitaire
Epitaxial growth of calcium carbonate on copper phosphorus brazing in domestic water
1 Laboratoire de Physicochimie Industrielle, Institut National des Sciences Appliquées.
2 Laboratoire de Physicochimie des interfaces, Ecole Centrale de Lyon.
Abstract
In this work, we studied the best resistance to corrosion of copper-phosphorus brazing (the most commonly used in domestic water supply pipes) in the Villeurbanne water at 20 °C, when coupled with copper.
It results, from electrochemical and ellipsometrical tests which have been carried out, that the passive film formed on brazing is thicker that the one formed on copper. This makes the brazing more noble than copper.
We hypothesized that the formation of a film thicker on brazing than on copper can be explained by an epitaxial growth of calcium carbonate and sulfate from hydroxyapatite and brishite (corrosion products) formed after brazing stay in water.
The analysis of this film and of the one formed on copper have been made by various techniques such as X Ray, SIMS, Raman.
© SIRPE 1990
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