抑制劑對鋅空氣電池鋅陽極腐蝕之影響

Effects of Inhibitors on the Corrosion of Zinc Anode in Zinc-air Battery

鋅陽極的腐蝕行為在鋅空氣電池性能中扮演極重要的角色。快速溶解的鋅陽極可以使電池提供大的電流。然而，鋅陽極的高腐蝕速率卻也大幅縮短電池的保存壽命。如何適度的抑制鋅陽極的腐蝕速率，乃為鋅空氣電池研發的重要議題之一。本研究利用電化學測量方法，探討兩種不同平均分子量的聚乙二醇有機腐蝕抑制劑（PEG600與PEG400）在8M KOH溶液中，對於鋅陽極的腐蝕抑制效果。實驗結果顯示，PEG600與PEG400兩種有機抑制劑皆可影響鋅的陰極反應而大幅降低其腐蝕電流密度，而前者的保護效率又優於後者。

The corrosion behaviors of zinc anode play an important role in the performance of zinc-air battery. Rapid dissolution of zinc anode provides the battery a large current density. However, the high corrosion rate of zinc anode significantly decreases the shelf life of zinc-air battery. How to properly suppress the self-discharge rate of zinc anode, therefore, becomes an important issue in the research of zinc-air battery. The present study has investigated the effects of organic corrosion inhibitors, namely, polyethylene glycol 600 (PEG600) and polyethylene glycol 400 (PEG400) on the corrosion of zinc anode in 8 M KOH solution by the electrochemical measurements. The results indicated that, both the PEG600 and PEG400 can affect the cathodic behaviors of Zn anode and dramatically decrease the corrosion current density. Additionally, the protection efficiency of the PEG600 is superior to the PEG400.