## Abstract

In previous work on galvanized reinforcements in contact with Ca-containing highly alkaline media the authors have reported the existence of a threshold pH of 13.3 ${\displaystyle \pm }$ 0.1 below which the Zn in contact with such a medium is passivated, but at pH values above this it corrodes continuously until it totally disappears. In this paper, the influence of the presence of ${\displaystyle SO_{4}}$ ions on the electrochemical behaviour of the galvanized has been studied.

It has been established that the precipitation of ${\displaystyle CaSO_{4}}$ with takes place in the media studied makes that the pH never surpasses the value of 13.3 ${\displaystyle \pm }$ 0.1. This coincidence with the pH threshold previously reported for passivation of the galvanized bars allows conclude that the sulfates not only are innocuous with respect to the galvanized behaviour in media which simulate the concrete but they are beneficial.

### Document information

Published on 01/01/1987

DOI: 10.1016/0008-8846(87)90113-X