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==Abstract== | ==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 <math>2%~~CaCl_2</math> 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 <math>400</math> days: an annealed-galvanized coating; another one obtained by dipping in a molten Zn bath with <math>0.025%</math> Al and some others produced at <math>450</math> and <math>430 | + | 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 <math>2%~~CaCl_2</math> 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 <math>400</math> days: an annealed-galvanized coating; another one obtained by dipping in a molten Zn bath with <math>0.025%</math> Al and some others produced at <math>450</math> and <math>430^o C</math> 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. | 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 <math>2.8</math> in the most favourable case, but in these conditions, coatings with thick, homogeneous <math>\eta</math> layer outperform the usual ones, and specially the annealed ones. | 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 <math>2.8</math> in the most favourable case, but in these conditions, coatings with thick, homogeneous <math>\eta</math> layer outperform the usual ones, and specially the annealed ones. | ||
Latest revision as of 10:36, 21 May 2020
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 Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 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 Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 400
days: an annealed-galvanized coating; another one obtained by dipping in a molten Zn bath with Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 0.025%
Al and some others produced at Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 450
and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 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 Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): 2.8
in the most favourable case, but in these conditions, coatings with thick, homogeneous Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://mathoid.scipedia.com/localhost/v1/":): \eta
layer outperform the usual ones, and specially the annealed ones.
Document information
Published on 01/01/1984
DOI: 10.1007/BF02473980
Licence: CC BY-NC-SA license
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