Caractéristiques du revêtement obtenu par prépassivation de l'acier galvanisé

P. Dreulle; M. J.-C. Bavay

doi:10.1051/mattech/197967090296

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Volume 67 / No 9 (1979)

Matériaux & Techniques, 67 9 (1979) 296-297

Abstract

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

Matériaux & Techniques, Vol. 67, N°9 (1979), pp. 296-297

Caractéristiques du revêtement obtenu par prépassivation de l'acier galvanisé^*

Coating characteristics obtained by prepassivation of galvanized steel^(*)

P. Dreulle¹ et M. J.-C. Bavay²

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.

^*

Communication présentée au colloque CEFRACOR 78.

^(*)

Paper presented at the CEFRACOR 78 colloqium.

© SIRPE 1979

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