台洲海轮海水压载舱的牺牲阳极法阴极保护

通过在台洲海轮上进行的实船试验，研究了压载水舱在两个浸水周期中的保护电位变化，以及四年实船试验的保护度与保护电流密度的关系。

CATHODIC PROTECTION WITH SACRIFICIAL ANODE FOR SEAWATER BALLAST TANK OF TAIZHOUHAI SHIP

A series of field experiments were made on Taizhouhai ship, whose wing water ballast tanks (WBT) were protected by zinc alloy sacrificial anodes. Various protection current densities were chosen according to the situation of coating, and the protection potentials were monitored by Zn/seawater reference electrodes during first two cycles of immersion. Variations of corrosion rate and protection percentage with protective current density during four year test were investigated. The results indicated that elevated temperature and stress accelerated corrosion. The higher was the protection current density, the lower was the corrosion rate. For the damaged coating, a protection current density of about 200 mA/m2 was suggested, while the protection potential would be lower than 0.15V(vs. Zn/seawater electrode). The higher protection current density for water ballast tank was recommanded.