| 摘要 |
869,711. Preventing corrosion. SABINS, R. C. Feb. 11, 1959 [Feb. 14, 1958], No. 4752/59. Class 123(1) An impressed current anode for protecting immersed structures such as ships' hulls from corrosion consists of a block 14 of lead in which is embedded a plug 72 of platinum, the surface of the plug being exposed to the electrolyte and serving to maintain the whole of the lead surface in an active condition. The anode 14 may be used in the protective circuit shown in Fig. 1 wherein 12 is the hull of a ship immersed in sea water 15. The applied current is regulated by an ammeter 18 and variable resistance 17 to maintain the potential of the hull with respect to a standard half cell 54 as measured by a voltmeter 58 at the level required to prevent corrosion. In a modification (Fig. 2, not shown) a sacrificial anode is included in the circuit to protect the structure 12 in the event of external current failure. Specification 868,820 is referred to. |
