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通过比较时效不同时间的Al-5Zn-0.03In-1Mg-0.05Ti-0.1Si阳极合金的析出相、开路电位、电流效率、腐蚀形貌及电化学阻抗谱等,研究了时效时间对该阳极微观组织和电化学性能的影响。结果表明:该合金中的主要析出相为Mg Zn2相,随时效时间的增加析出相迅速长大且密度逐渐降低。时效30 min试样的电化学性能最好,开路电位约-1.0793 V(SCE),电流效率为94.5%,试样表面腐蚀坑深度很浅、腐蚀形貌非常均匀。随着时效时间延长,合金的开路电位逐渐负移,但电流效率却逐渐降低且腐蚀形貌逐渐恶化。析出相对铝基牺牲阳极的电化学性能影响较大,长时间时效不利于改善铝合金阳极的综合电化学性能。
The effects of aging time on the microstructure of the anode were investigated by comparing the precipitates, the open circuit potential, the current efficiency, the corrosion morphology and the electrochemical impedance spectroscopy of the Al-5Zn-0.03In-1Mg-0.05Ti-0.1Si anodic alloy at different aging time. Effects of tissue and electrochemical properties. The results show that the main precipitated phase in the alloy is Mg-Zn2 phase. With the increase of aging time, the precipitated phase grows rapidly and the density gradually decreases. The electrochemical performance of the sample after aging for 30 min was the best. The open circuit potential was about -1.0793 V (SCE) and the current efficiency was 94.5%. The depth of corrosion pits was very shallow and the corrosion morphology was very uniform. With the aging time, the open-circuit potential of the alloy gradually negative, but the current efficiency is gradually reduced and the corrosion morphology gradually deteriorated. Compared with the sacrificial anode, the electrochemical performance of the sacrificial anode is greatly affected. Prolonged aging is not conducive to improving the electrochemical performance of the aluminum alloy anode.