室温轧制及固溶处理对Al-Ga-Mg-Mn-Bi阳极合金电化学性能的影响

Effect of Rolling and Solution Treatment on Electrochemical Properties of Al-Ga-Mg-Mn-Bi Anode Alloy

对Al-Ga-Mg-Mn-Bi阳极合金固溶处理和常温轧制变形,测量不同处理状态下的电化学阻抗谱、极化曲线、自腐蚀速率等,研究固溶和轧制处理对该合金的组织及电化学性能的影响。结果表明:与铸态试样相比,固溶处理减少了铝阳极组织中第二相的数量,较大程度地降低铝阳极的自腐蚀和析氢速率,改善了合金的腐蚀形貌,使恒流放电的电位负移;轧制处理使恒流放电的电位负移,能够明显改善铝阳极的腐蚀形貌。

Influence of solution treatment and cool rolling deformation on the microstructure and electrochemical performance of the Al-Ga-Mg-Mn-Bi anode alloy was investigated by measuring the impedance spectroscopy, polarization curve, free-corrosion rate, etc. The results show that: in comparison with the cast alloy, the quantity of the second phase, the free-corrosion rate and the hydrogen evolution rate of the solution-treated alloy were greatly reduced, while the amount and size of corrosion pits were also reduced with a negative shift of its potential of constant- current discharge; after cool rolling deformation the alloy exhibits a rather uniform corrosion morphology with small pits and also a negative shift of its potential of constant-current discharge.