| Titre : |
Unified model for the degradation of organic coatings on steel in a neutral electrolyte |
| Type de document : |
texte imprimé |
| Auteurs : |
T. Nguyen, Auteur ; J.B Hubbard, Auteur |
| Année de publication : |
1996 |
| Article en page(s) : |
p. 45-55 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosion
Corrosion
Métaux -- Revêtements protecteurs
Modèles mathématiques
Revêtements
Revêtements protecteurs -- Détérioration
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
A unified model is presented for the degradation of an organic protective coating on a steel substrate exposed to a neutral electrolytic environment. This model is based on theoretical and experimental studies from our laboratory and on current understanding of the degradation process. The assumptions of the model are based on the concept that degradation of a coating/steel system occurs following the transport of ions through conductive pathways, which are presumably formed by an attack by water in the hydrophylic, low-molecular-weight/low-cross-linked regions, followed by the connections of these regions. Models for the blistering and delamination resulting from corrosion processes are based on the diffusion of cations along the coating/steel interface from the defects to cathodic sites under the coatings. The resulting equations are solved to predict ion fluxes and concentration profiles along the interface and within blisters. Model variables include blister size, distance between blister and defect, ion diffusivity, and potential gradients. Experimental results agree well with theoretical predictions. |
| Note de contenu : |
- DEGRADATION MODES OF ORGANIC-COATED STEEL IN NEUTRAL ELECTROLYTES
- UNIFIED MODEL FOR DEGRADATION OF ORGANIC-COATED STEEL : Conceptual model - Formation of conductive pathways - Transport of corrosive species to the metal surface - Degradation at the defect or Pathway - Degradation around the defect or pathway
- MATHEMATICAL MODEL : Transport of ions to metal surface - Cathodic blistering and delamination |
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in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 68, N° 855 (04/1996) . - p. 45-55
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