Internally tin-coated copper pipe and method for coating a coppe

Details Internally tin-coated copper pipe and method for coating a coppe Internally tin-coated copper pipe and method for coating a coppe

1997-12-23

2000-03-28

Kashnikow, Andres

Pipes and tubular conduits

Distinct layers

Coated

138143, 427426, C23C 302, F16L 5804, F16L 914

Patent

active

060418281

ABSTRACT:
A copper installation pipe having a tin coating that is applied with temperature control so as to be adherent over the entire inner surface. The thickness of the intermetallic phase formed at the transition from the copper pipe to the tin coating is less than 20%, preferably less than 5% of the overall coating thickness. In addition, a method for coating an installation pipe using chemical treatment, where the temperature of the tinning solution is selectively varied. To ensure the smallest possible intermetallic phase at the copper surface, one begins the tinning process at a low temperature. This promotes the formation of a large number of uniformly distributed nuclei of crystallization having the same orientation. The temperature is then selectively adjusted to promote crystal growth, the result being that the crystals grow rapidly with the orientation remaining constant. One then achieves a dense tin coating having a minimal exposed surface area.

REFERENCES:
patent: 3943616 (1976-03-01), Smith et al.
patent: 4234631 (1980-11-01), Davis
patent: 4269625 (1981-05-01), Molenaar
patent: 5248527 (1993-09-01), Ichida et al.
patent: 5296268 (1994-03-01), Iantosca
patent: 5302256 (1994-04-01), Miura et al.
patent: 5769129 (1998-06-01), Kuroda et al.

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