zinc
- Domaine
-
- chimiechimie minérale
- Date
Définition :
Métal gris-blanc brillant. Il apparaît assez largement dans la nature sous diverses formes. On l'obtient par réduction de l'oxyde ou par électrolyse du sulfate.
Note :
Il entre dans la composition de beaucoup d'alliages et est très utilisé pour la galvanisation du fer ou de l'acier. Il sert d'électrode dans les piles leclanché ainsi que dans d'autres piles ou accumulateurs.
Termes :
- zinc n. m.
- Zn
Traductions
-
anglais
Date :Définition
An element. State: solid; group: IIB; atomic no.: 30; atomic Wt.: 65.38; Valence: 2; isotopes: 5 stable. Zinc, m.p. 419 °C (786 °F).
Zinc has a white colour with a bluish tinge. It has a bright metallic lustre on a freshly fractured surface and is capable of taking a high polish.Notes :
From the Greek.
The most notable chemical property of zinc is its pronounced electropositive nature; it is third among the common metals in this respect, exceeded only by aluminum and magnesium. For this reason, it is particularly effective as a protective coating for steel (galvanized coatings), in which the phenomenon called sacrificial protection occurs. Other important applications are in alloys with copper (brass) and with aluminum (die castings). Neither the metal nor its inorganic compounds are toxic. The most important of the later are zinc oxide and zinc sulfide, used in paint pigment (lithopone), and zinc chloride used in dry cell batteries, textile printing, and as a fireproofing agent for timber and growing trees. Organic compounds of zinc are used as polymerization catalysts and ultra-accelerators of vulcanization; diethylzinc is spontaneously flammable.Termes :
- zinc
- Zn