几种牺牲阳极在干湿交替条件下的自放电行为比较

模拟海水与空气的干湿交替条件,对四种海船常用牺牲阳极的自放电行为进行了研究。通过测定工作电位、发生电流、溶解性能、溶解产物成分,分析了四种牺牲阳极在经历不同间浸工作周期后的电化学性能,特别是再活化性能。结果表明:在干湿交替条件下,Zn-Al-Cd阳极的电化学性能降低幅度最大,Al-Zn-In-Cd阳极次之,它们均不适合在此环境中使用;Al-Zn-In-Mg-Ti的电化学性能比前两者好,Al-Zn-In-Mg-Ga-Mn则最适合作为干湿交替环境中的牺牲阳极。

Comparison of Self-discharge Behavior of Sacrificial Anodes under Wet-dry Cycling Conditions

The self-discharge behaviors of four sacrificial anodes commonly used in seagoing ships were investigated under seawater and air alternative wet-dry cycling conditions. Working potential, electric current, solubility, and dissolved products were measured, and the electrochemical properties, especially the reactivation property, of four sacrificial anodes after different wet-dry cycles were analyzed. The results indicated that the electrochemical property of Zn-A1-Cd anode decreases more than others and A1-Zn-In-Cd anode the second worse. Both of these anodes were all not suitable for use in wet-dry cycling environment. A1-Zn-In-Mg-Ti anode has better electrochemical property and A1-Zn-In-Mg-Ga-Mn anode is the most suitable sacrificial anode for cathodic protection under wet-dry cycling conditions.