Process and apparatus for in situ electroforming a...

C - Chemistry – Metallurgy – 25 – D

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C25D 7/04 (2006.01) F28F 11/00 (2006.01)

Patent

CA 2175597

A process for repairing degraded sections of metal tubes, such as heat exchanger tubes, by in situ electroforming utilizes a probe containing an electrode (25). The probe is movable through the tube (13) to the site of degradation and is sealed in place, thereby creating an electrochemical cell. Electrolyte flows from a reservoir (34) through the cell and a structural layer of metal is deposited on the tube using a pulsed direct current and a duty cycle of 10-60 %. The metal layer so formed possesses an ultrafine grain size preferably with a highly twinned microcrystalline structure giving the layer excellent mechanical properties.

Procédé utilisant un échantillon renfermant une électrode (25) pour la réparation de parties endommagées de tubes métalliques, par exemple de tubes d'échangeurs de chaleur, par électroformage in situ. Ledit échantillon peut se déplacer à travers le tube (13) vers la zone endommagée où il est scellé, créant ainsi une cellule électrochimique. L'électrolyte provenant d'un réservoir (34) traverse la cellule pour déposer une couche structurale métallique sur le tube au moyen d'un courant continu pulsé et d'un rapport cyclique de 10 à 60 %. La couche métallique ainsi obtenue possède une granulométrie ultrafine, de préférence à structure microcristalline fortement maclée, conférant à la couche d'excellentes propriétés mécaniques.

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