高活性铝合金阳极的电化学行为

Electrochemical Behavior of High Activate Aluminum Alloy Sacrificial Anode

制备了Al-Ga-In-Bi-Pb-Mg、Al-Ga-In-Cd-Mg和Al-Ga-In-Pb-Mg等3种铝阳极合金材料。采用腐蚀质量损失法、排水法和电化学方法分别测试了合金的自腐蚀速率、析氢速率及电化学性能,并采用SEM分析了合金腐蚀后的表面形貌。结果表明,制备的3种铝阳极合金在5mol/L的NaOH溶液中均具有较负的开路电压、低的自腐蚀速率和析氢速率,并且随着极化电位的增加,各合金均具有很高的电化学活性。

Three kinds of aluminum anodes,including Al-Ga-In-Bi-Pb-Mg,Al-Ga-In-Cd-Mg and Al-Ga-In-Pb-Mg,were prepared.The self-corrosion rates of the alloys were tested by measuring corrosion weight loss,hydrogen evolution rates were measured by water immersion technique,electrochemical behavior was examined by electrochemical method,and surface morphology of corrosion alloys was observed by SEM(scanning electron microscope).The results show that three aluminum alloy anodes have higher negative open circuit potentials,low self corrosion rates and low hydrogen evolution in the 5 mol/L solution.Moreover,with the increase of polarization potential,three anodes exhibit higher electrochemical activities.