一、前言阴极保护是港工、水工钢结构物的主要防护措施之一,辅助阳极则是外加电流阴极保护装置中一个重要的组成部分。其基本技术经济指标是:良导体,阳极极化率低,允许电流密度大,消耗率低,反电动势小,机械性能好,价格低和来源广等。目前,国内采用的阳极材料有钛镀铂、钛镀镣、铅银合金嵌铂丝等微溶性电极和铅银合金、钛镀二氧化铅、高硅铸铁、石墨等难溶性电极。前者虽耐蚀性强,但价格昂贵, I. Introduction Cathodic protection is one of the major protective measures for Hong Kong workers and hydraulic steel structures. The auxiliary anode is an important part of the applied current cathodic protection device. Its basic technical and economic indicators are: good conductor, low anodic polarization, allowing current density, low consumption, low back EMF, good mechanical properties, low prices and wide sources. At present, anode materials used in China are titanium-plated platinum, titanium-plated 镣, lead-silver alloy embedded platinum wire and other soluble electrodes and lead-silver alloy, titanium-plated lead dioxide, high silicon cast iron, graphite and other insoluble electrodes. Although the former corrosion resistance, but expensive,