Abstract: Anti-corrosion performance of aluminum alloys used in the equipment of seawater desalination can be improved by reducing the concentrations of heavy metal ions in seawater. Removal of Cu2+ in seawater using 5052 aluminum-alloy rings filled in an ion-exchange column as the reducing agent was studied with the redox method. The effect of such factors as temperature，velocity of seawater and initial concentration of Cu2+ in seawater was studied. The surface of aluminum alloys was also characterized by X-ray powder diffraction and scanning electron microscopy. The results showed that 88% of Cu2+ in the seawater can be effectively removed. The efficiency of removing Cu2+ from seawater increased with increasing temperature of seawater and decreasing velocity of seawater. Higher initial concentration of Cu2+ in seawater reduced the efficiency of removal of Cu2+.

Key words: seawater desalination, aluminum alloys, redox, Cu2+

摘要： 阐述了去除海水中的重金属离子对提高海水淡化装置中铝合金材料耐腐蚀性能的作用。采用填充在离子交换塔中的5052铝合金环作为还原剂，研究了海水流速、海水温度以及海水中铜离子的初始浓度对脱除海水中Cu2+效果的影响，并对试验前后的铝合金还原剂的表面进行了表征。结果表明，铜离子的脱除率可达88%。流速的降低与温度的上升，使铜离子的脱除率升高；铜离子浓度增大，铜离子的脱除率降低。

关键词: 海水淡化, 铝合金, 氧化还原, 铜离子