牺牲阳极Sacrificial anodes
钢闸门的保护，有的就应用这种方法。它是用一种更为活泼的金属，如锌等，连接在钢闸门上。这样，当发生电化学腐蚀时，被腐蚀的就是那种比铁更活泼的金属，而铁被保护了。通常在轮船的尾部和在船壳的水线以下部分，装上一定数量的锌块，来防止船壳等的腐蚀，就是应用的这种方法。电化学保护法的应用除海水或河道中钢铁设备的保护外，还应用于防止电缆、石油管道、地下设备和化工设备等的腐蚀。
This method is applied to the protection of steel gates. It is connected to the steel gate with a more active metal, such as zinc. In this way, when electrochemical corrosion occurs, the metal that is corroded is the one that is more active than iron, and iron is protected. This method is usually applied to the stern part of a ship and the part below the water line of the hull, where a certain amount of zinc blocks are installed to prevent the corrosion of the hull, etc. In addition to the protection of steel equipment in seawater or rivers, the application of electrochemical protection method is also applied to prevent corrosion of cables, oil pipelines, underground equipment and chemical equipment.
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