采用恒电流试验评价了不同Ga含量的Al-Ga二元合金牺牲阳极的电化学性能，并通过X射线衍射、扫描电镜及能谱分析、回沉积等实验探讨了阳极的活化溶解机制。结果表明，采用高纯铝锭炼制的Al-0.07%Ga 二元合金工作电位在-0.820 V~-0.876 V（vs.Ag/AgCl海水）之间，而用工业铝锭Al99.85炼制的Al-0.1%Ga二元合金阳极工作电位在 -0.802 V~-0.818 V之间，基本满足低驱动电位牺牲阳极的要求，但局部腐蚀溶解均较严重，溶解性能有待改善；Al-Ga合金腐蚀产物中的 Ga含量随基体中Ga含量的增加而增加，但远小于基体中的Ga含量；溶解后阳极表面的Ga含量大于基体中Ga含量，原因是溶解在溶液中的 Ga3+回沉积到阳极表面，使得阳极表面Ga含量增加；Al-Ga阳极的活化符合溶解-再沉积机理。
The electrochemical performance of Al-Ga binary alloy with different Ga content were evaluated by constant current test. And the activation mechanism was investigated by X-Ray, SEM+EDS and redeposit experiment. The results showed that Al-0.07%Ga welded by high purity aluminum and Al-0.1%Ga welded by Al99.85 exhibit suitable working potential as low driving voltage sacrificial anode for cathodic protection of high strength steel. Their working potential was varied from -820 mV~-876 mV, -802 mV~-818 mV (vs. Ag/AgCl seawater) respectively. However, their performance needs to be improved for its serious local dissolution morphology. The Ga content of corrosion product was increasing with increasing of the Ga content of anode matrix, but the latter is far greater than the former. The content of Ga in anode surface is increasing for Ga3+ redeposit to the surface. The activation mechanism of Al-Ga anode obeys dissolution-redeposit mechanism.
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