[article]
| Titre : |
Electrochemical corrosion - Part 3 |
| Type de document : |
texte imprimé |
| Auteurs : |
P. K. Kamani, Auteur |
| Année de publication : |
2013 |
| Article en page(s) : |
p. 108-112 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Corrosion électrochimique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The corrosion of metals occurs primarily by electrochemical processes involving metal oxidation and simultaneous reduction of some other species. The mechanism involved in electrochemical corrosion (ECC) differs substantially from that of chemical corrosion. The ECC is characterised principally by localisation of the anodic and cathodic processes in different regions of the surface. These "sites" together make up a corrosion cell. The rate of ECC more or less depends upon the anodic and cathodic potentials. The potential difference causes flow of electron when the anode and cathode are in contact or electrically connected (short-circuited). The potential difference (EMF) and resistance in the circuit control the flow of charges or current.
The electrochemical corrosion is due to the formation of cells (anode and cathode) in the metal. These cells can be formed by one or many reasons e.g. due to grain boundaries in the Metal, rnechanical treatment given to metal, difference in concentration of electrolyte, difference in composition of metal, varying temperature of metal, difference in pH of environment, the metal is exposed to, variation in oxygen of metal environnent, variation in radiant energy, metal is subjected to, etc. The approach in designing the structures, equipments etc. and in selecting the metal should be such that, the cell formation does not take place, though it is difficult but can be reduced by judicious application of available technologies. |
| Note de contenu : |
- ELECTROCHEMISTRY : 1. Galvanic cells - (Metallurgical structure - Metallurgical conditions) - 2. Concentration cell (Differential electrolyte concentration or differential salt concentration cell - Differential oxygen concentration or differential aeration cells - Differential temperature cells)
- ELECTROLYTE CELLS |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19656 |
in PAINTINDIA > Vol. LXIII, N° 7 (07/2013) . - p. 108-112
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Electrochemical corrosion - Part 3 in PAINTINDIA, Vol. LXIII, N° 7 (07/2013)
