| 摘要 |
In cathodically protecting against corrosion a metal body in contact with an electrolyte solution, an anode is disposed in the electrolyte and the anode is subjected to a forced cyclic movement in a predetermined cyclic path in relation to the surface of the body to be protected. The anode may be of the type on which no external voltage is impressed, e.g. of Mg, or of the type on which a voltage is impressed. The path of movement of the anode may be adapted to the geometry of the system. The speed of the anode and the current may be varied. Periodic regulation of current may be by varying mechanical screening of the anode as described in Specification 1,117,525. Directioning of current may be obtained by varying the anode's orientation, e.g. where the anode is a plate having an insulating coating on its edges and one side. More than one anode may be used, e.g. there may be a combination of moving and stationary anodes. A control system for the cathodic protection may comprise fixed and moving reference electrodes. An example simulates protection of a steel cargo tank from corrosion by sea water using a magnesium anode which is forced to move in a circle. |
