C - Chemistry – Metallurgy – 25 – F
Patent
C - Chemistry, Metallurgy
25
F
C25F 1/06 (2006.01) C21D 1/82 (2006.01)
Patent
CA 2145167
A manufactured metal member, such as a wire, having a magnetite oxide film thereon, is subjected to mechanical stress to produce cracking of the magnetitc film approximately to the surface of the metal member. The metal member is then moved through an electrolysis cell bath in which the metal member forms the anode thereof, and vertically positioned steel bars form the cathode. A pulsating DC current is applied to the anode and the cathode. The current flows to the surface of the metal member via the cracks in the oxide, maintaining the metal member anode in a state of depassivation and loosening the bond between the oxide film and the metal member. The loosened magnetite is then readily cleaned off the metal member. A thermal stressing step may also be used prior to the mechanical stressing.
On soumet un élément métallique manufacturé tel qu'un fil recouvert d'un film d'oxyde de magnétite à une contrainte mécanique afin de provoquer le craquage dudit film à la surface de l'élément métallique. L'élément métallique traverse ensuite un bain à cellule d'électrolyse dans lequel il forme l'anode de celui-ci, et des barres en acier placées verticalement forment l'anode. On applique un courant continu pulsé sur l'anode et la cathode. Le courant s'écoule à la surface de l'élément métallique par les fissures formées dans l'oxyde, ce qui permet de maintenir l'anode constituée par l'élément métallique dans un état de dépassivation et de désagréger la liaison entre le film d'oxyde et l'élément métallique. On enlève ensuite facilement la magnétite de l'élément métallique. On peut également utiliser une phase de contrainte thermique avant la contrainte mécanique.
Donahue Harvey
Hoy Brenda
Kim Ronald D.
Oehr Klaus Heinrich
Roth Reinhold C.
Dynamotive Corporation
Kent & Edgar
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