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一、前言湛江某码头腐蚀破坏最严重的构件是码头的次梁,而次梁位于海水飞溅区及潮汐区上部,这就决定了在该部位只能采用外加电流法阴极保护。由于混凝土电阻率很高,要使保护电流能均匀地到达钢筋,必须在混凝土表面复盖一层导电混凝土并安置阳极。把该阳极接到电源的正端,混凝土中的钢筋与电源的负端连接,只要所送入的电流量足够,就能使钢筋免遭腐蚀。 Stratfull等在1973年至1980年,用高硅铸铁做主阳极,石油沥青导电复盖层做次阳极,所建立的公路桥面板阴极保护系统
I. Foreword At the pier in Zhanjiang, the most serious component of corrosion is the secondary beam of the wharf. The secondary beam is located in the upper part of the splash zone and the tidal zone. This determines that only cathodic protection can be applied at this site. Due to the high resistivity of concrete, a uniform layer of conductive concrete must be placed on the concrete surface and the anode placed so that the protective current can reach the reinforcing steel evenly. The anode is connected to the positive terminal of the power supply. The reinforcing steel in the concrete is connected to the negative terminal of the power supply. As long as the amount of current supplied is sufficient, the reinforcement can be protected from corrosion. Stratfull et al., From 1973 to 1980, made the main anode of high-silicon cast iron and the secondary anode of petroleum asphalt conductive overlay. The cathodic protection system of highway bridge deck