The corrosion and electrochemical behavior of pure aluminum in additive‐containing alkaline methanol–water mixed solutions

Abstract

The corrosion and electrochemical behavior of aluminum in inhibited and uninhibited 4 M KOH-methanol-water mixed solutions with a methanol/water volume ratio of 3:2 were investigated by means of hydrogen collection, polarization curve, galvanostatic discharge, and electrochemical impedance spectroscopy (EIS). The results of hydrogen collection and electrochemical experiments showed that the addition of ZnO can obviously inhibit the corrosion of aluminum in the 4 M KOH-methanol-water solutions, and its inhibition effect can be enhanced in the hydroxytryptamine (HT)-containing KOH solution. The results of scanning electron microscopy (SEM) and energy dispersive analysis of X-ray (EDAX) revealed that ZnO produces the inhibition effect by the formation of a zinc-containing deposit layer on the surface of aluminum, and the cooperative effect of ZnO and HT may improve the deposit of zinc. The results of galvanostatic discharge indicated that aluminum can present good electrochemical activity in the 4 M KOH-methanol-water solution with 0.2 M ZnO and 1.0 mL/L HT.

Performance of commercial aluminium alloys as anodes in gelled electrolyte aluminium-air batteries

“…This performance took place using both Zn additives. The higher inhibition properties of the ZnO vs. ZnCl 2 could be explained by the fact that the ZnO reacted to the zincate form in the highly alkaline solution to form the Zn cover, as described by Wang et al [22]:…”

Ethylene Glycol/Ethanol Anolyte for High Capacity Alkaline Aluminum-Air Battery With Dual-Electrolyte Configuration

“…Methanol offers excellent corrosion inhibition in an alkaline solution (Wang et al, 2007(Wang et al, , 2009. Earlier, methanol was applied as an anolyte in dual-electrolyte AABs (Wang et al, 2014;Teabnamang et al, 2020).…”

Aluminum corrosion mitigation in alkaline electrolytes containing hybrid inorganic/organic inhibitor system for power sources applications

“…It was also shown that ZnO reduces Al corrosion rate, while it does not affect the anodic characteristic (current density and over-potential) of Al [35]. Much weaker inhibition effect than ZnO was established with polyaniline [36], methanol [37], hydroxytryptamine [38] dimethyl amine epoxy propane [39] and sodium silicate [40]. It was also reported that the protection effect of these inhibitors might be improved by the addition of haloidions to the alkaline solution [41].…”