Tin coated electrical connector

C - Chemistry – Metallurgy – 25 – D

Patent

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Details

C25D 5/10 (2006.01) B32B 15/01 (2006.01) H01B 13/22 (2006.01) H01R 4/58 (2006.01) H01R 13/03 (2006.01)

Patent

CA 2240239

An electrical conductor (10) has a copper base substrate (12) coated with a tin base coating layer (14). To inhibit the diffusion of copper from the substrate (12) into the coating layer (14) and the consequential formation of a brittle tin/copper intermetallic, a barrier layer (16) is interposed between the substrate (12) and the coating layer (14). This barrier layer (16) contains from 20% to 40%, by weight, of nickel and is preferably predominantly comprised of copper. In one embodiment, an intermetallic layer (38) selected from the group (Cu-Ni) 3Sn, (Cu-Ni) 6Sn5, Cu3Sn, Cu6Sn5 is disposed between the barrier layer (16) and the tin base coating layer (14).

Un conducteur électrique (10) a un substrat de base en cuivre (12) recouvert d'une couche de revêtement de base en étain (14). Pour inhiber la diffusion du cuivre à partir du substrat (12) dans la couche de revêtement (14) et la formation subséquente d'un alliage intermétallique fragile d'étain/cuivre, une couche barrière (16) est interposée entre le substrat (12) et la couche de revêtement (14). Cette couche barrière (16) contient de 20 % à 40 %, en poids de nickel et de préférence est principalement composée de cuivre. Dans une réalisation, une couche intermétallique (38) sélectionnée du groupe (Cu-Ni) 3Sn, (Cu-Ni) 6Sn5, Cu3Sn, Cu6Sn5 est disposée entre la couche barrière (16) et la couche de revêtement de base en étain (14).

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