Bonjour,
La corrosion électrochimique touche essentiellement les matériaux métalliques. Mais elle touche aussi les polymères et les céramiques par contre j'ai l'impression qu'on parle plutôt de dégradation que de corrosion dans le cas de ces matériaux.
Quelle est la différence entre corrosion et dégradation?
Merci à vous!
Nicolas
Bonsoir
Selon le Gold Book de l'IUPAC
corrosion :
An irreversible interfacial reaction of a material (metal, ceramic, polymer) with its enviroment which results in consumption of the material or in dissolution into the material of a component of the enviroment. Often, but not necessarily, corrosion results in effects detrimental to the usage of the material considered. Exclusively physical or mechanical processes such as melting or evaporation, abrasion or mechanical fracture are not included in the term corrosion.
polymer degradation:
Chemical changes in a polymeric material that usually result in undesirable changes in the in-use properties of the material.
Notes:
In most cases (e.g., in vinyl polymers, polyamides) degradation is accompanied by a decrease in molar mass. In some cases (e.g., in polymers with aromatic rings in the main chain), degradation means changes in chemical structure. It can also be accompanied by crosslinking.
Usually, degradation results in the loss of, or deterioration in, useful properties of the material. However, in the case of biodegradation (degradation by biological activity), polymers may change into environmentally acceptable substances with desirable properties.
Cordialement
Bonjour,
Merci à vous!
