| 摘要 |
A hollow anode (A) for an apparatus for the galvanic coating of the running surfaces of cylinders is provided with a plurality of passages (P) formed in the top portion (T) thereof, the total area of the passages (P) being such as to achieve at least a 50% reduction in the surface of the anode (A) at said top portion (T), that has a height between 4 and 12 mm. In this way there is achieved a decrease in the electrical field at the top of the cylinder without affecting the deposition in the rest of the cylinder and it is therefore possible to obtain a perfect coating up to the corners (C) of a closed cylinder, while decreasing the deposition on the vault (V) of the combustion chamber. Furthermore, it is also possible to increase the flow rate of the electrolyte through the apparatus thus decreasing the coating time and exploiting a greater hydraulic pressure of the electrolyte, which provides a mechanical effect that favors the deposition, especially at the corners; and in the application to open cylinders the build-up at the sharp edges of the usual flaring is reduced, thus dispensing with a further working prior to or after the coating treatment. |
