Issue |
Matériaux & Techniques
Volume 67, Number 9, 1979
|
|
---|---|---|
Page(s) | 296 - 297 | |
DOI | https://doi.org/10.1051/mattech/197967090296 | |
Published online | 21 April 2017 |
Caractéristiques du revêtement obtenu par prépassivation de l'acier galvanisé*
Coating characteristics obtained by prepassivation of galvanized steel(*)
1
Compagnie Royale Asturienne des Mines
2
Groupe d'Etude de la Corrosion de Lille
Abstract
In the hot water production and distribution installations, galvanized steel may be protected against localized corrosion by a hydrated zinc pyrophosphate coating, Zn2P2O7, 3H2O. This insoluble compound is formed out of galvanizing zinc,, partly oxidized by hydrogen ions, and pyrophosphate ions P2O72— freed by hydrolysis of hexametaphosphate PO3—. Such a surface treatment favours the subsequent obtaining of a faultless natural passivating layer and thus decreases considerably the susceptibility to pitting corrosion in presence of cupric ions.
© SIRPE 1979
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