## Abstract

In the present work is described the effect of the characteristics of the galvanized coating on corrosion rate of reinforcing bars embedded in a concrete without additives and in another with ${\displaystyle 2\%~~CaCl_{2}}$ in terms of cement weight. To this end, the following materials were subjected to the action of a moisture saturated atmosphere for a period of ${\displaystyle 400}$ days: an annealed-galvanized coating; another one obtained by dipping in a molten Zn bath with ${\displaystyle 0.025\%}$ Al and some others produced at ${\displaystyle 450}$ and ${\displaystyle 430^{o}C}$ in an ordinary bath.

The attack evolution vs time was controlled by measuring the polarization resistance. The electrochemical determinations were gravimetrically verified and supplemented by a metallographic examination of tests coatings.

In the absence of chlorides, the attack is fully tolerated. Chlorides radically change the corrosion behaviour of galvanized steel and increase the attack by a factor of ${\displaystyle 2.8}$ in the most favourable case, but in these conditions, coatings with thick, homogeneous ${\displaystyle \eta }$ layer outperform the usual ones, and specially the annealed ones.

### Document information

Published on 01/01/1984

DOI: 10.1007/BF02473980