Device for cleaning metal surfaces after they have been...

C - Chemistry – Metallurgy – 25 – F

Patent

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C25F 7/00 (2006.01)

Patent

CA 2232571

The device proposed for cleaning metal surfaces consist of pad (12, 34, 91) of insulating material held between a beak-shaped (11, 52, 94) electrode (10, 26, 46) and the metal surface (8) tobe cleaned, plus a low-voltage a.c. power supply (2) which is connected via the other electro- de to the metal (7). A pump supplies the pad with a highly corrosive, high-density, acid solution. The pad consists of a relatively thick hose or tape. The device has slots (36) into which the gases and vapours produced during cleaning are drawn by an extractor fan (40) and then passed through a washing bottle (41) where they are cleaned. The electrode may have various shapes, and it is possible to replace the tip (28, 94, 98). The electrode is preferably designed with bores through which the acid solution can be fed. The main body (97) of the electrode and the replaceable tip (94, 98) may be coated with a la- yer (101, 100) of insulating material which prevents short-cicuits occurring and concentrates the electrolitic action ant the end surface (102) of the electrode. Woven of felt fabric made of plyetheretherketone is preferably used as the insulating material of the pad. The lifetime and working capacity of the device are maximized by using a double-layer pad (92, 93), the inner layer being made of woven fabric (92) and the other layer of felt (93).

Ce dispositif de nettoyage de métaux comprend un tampon (12, 34, 91) en matériau isolant monté entre l'électrode (10, 26, 46) en forme de bec (11, 52, 94) et le métal à nettoyer (8), ainsi qu'une source de courant alternatif (8) de basse tension également connectée, avec l'autre électrode, au métal (7). Une pompe alimente le tampon en une solution acide de haute densité et très agressive. Le tampon est constitué d'un manchon ou d'une bande relativement épaisse. Le dispositif est pourvu de fentes (36) à travers lesquelles les gaz et les vapeurs dégagés pendant le traitement sont aspirés par un ventilateur aspirant (40), puis amenés à travers un filtre humide (41) où ils sont nettoyés. L'électrode en forme de bec peut prendre des formes multiples et l'extrémité (28, 94, 98) peut être remplacée. L'électrode en forme de bec est de préférence pourvue de passages à travers lesquels s'écoule la solution acide. Le corps (97) de l'électrode et son extrémité remplaçable (94, 98) peuvent être revêtus d'un film (101, 100) en matériau isolant qui les protège de courts-circuits et qui concentre l'action électrique à la surface terminale (102) de l'électrode. Comme matériau isolant du tampon on utilise de préférence un tissu ou feutre en polyétheréthercétone. La vie utile et les rendements sont maximisés lorsque l'on utilise un tampon à double couche (92, 93) dont la couche intérieure est en tissu (92) et la couche extérieure est en feutre (93).

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