Patent · US Expired

Slow consumable non-carbon metal-based anodes for aluminium production cells

US6248227A · kind A · utility

13Cited by
7References
29Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 30, 1998
Grant dateJun 19, 2001
Priority date—
Expiry dateJul 30, 2018

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC25C3/12
  • WIPO fieldSurface technology, coating
  • WIPO sectorChemistry

Abstract

A non-carbon, metal-based slow-consumable anode of a cell for the electrowinning of aluminium self-forms during normal electrolysis an electrochemically-active oxide-based surface layer (20). The rate of formation (35) of the layer (20) is substantially equal to its rate of dissolution (30) at the surface layer/electrolyte interface (25) thereby maintaining its thickness substantially constant, forming a limited barrier controlling the oxidation rate (35). The anode (10) usually comprises an alloy of iron with at least one of nickel, copper, cobalt or zinc which during use forms an oxide surface layer (20) mainly containing ferrite.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.