In recent years, due to the limitations of mineral energy, fossil fuels such as coal and oil have gradually dried up, and global energy demand is growing. It is urgent to develop new clean energy and safe and efficient energy storage methods. The battery industry is seeking a renewable and recycled battery system to replace traditional batteries.
Compared with widely used lithium-ion batteries, metal air batteries are considered a new type of green power source with great potential for future development due to their advantages such as large capacity, high specific energy, low cost, stable discharge, and low pollution. Aluminum, due to its abundant resources and low price, has become the most attractive electrode material in metal air batteries. However, despite its many advantages and promising application prospects, aluminum electrodes exhibit severe hydrogen evolution corrosion in alkaline electrolytes, greatly affecting the performance and lifespan of batteries and hindering their widespread application. Therefore, researchers will efficiently The application of green corrosion inhibitors in the research of aluminum air batteries can greatly slow down the corrosion rate of aluminum electrodes, improve the utilization rate and lifespan of aluminum electrodes, and ultimately extend the service life of the battery.
In existing research, the combination of inorganic and organic corrosion inhibitors is the most commonly used. Among them, inorganic compounds such as metal oxides and rare earth elements are commonly used in combination with organic macromolecules such as amino acids, polysaccharides such as glucose, and surfactants. Calcium hydroxide formed by calcium oxide in alkaline electrolytes is attached to the surface of aluminum alloys through geometric coverage effect, represented by calcium oxide and L-aspartic acid, While fully exerting its corrosion inhibition effect, it also acts as a "needle and thread", connecting the aspartic acid molecules with aluminum ions and calcium hydroxide, weaving a fine "network" - Ca (OH) 2-L-Asp and Al Asp single molecule composite film layer, effectively suppressing the hydrogen evolution corrosion reaction of aluminum alloys.
Although research on corrosion inhibitors has a history of over a hundred years, the development and application of corrosion inhibitors play an extremely important role in fields such as chemical engineering, petroleum, electricity, machinery, metal processing, transportation, nuclear energy, and aerospace. The variety and quality of corrosion inhibitors have also been further improved. However, there is still a lot of room for development for corrosion inhibitors themselves, as there is no perfect person, Developing more efficient corrosion inhibitors and continuously optimizing their performance remains a research hotspot. At the same time, the study also needs to continuously adjust experimental conditions, such as the proportion of compound, concentration of corrosion inhibitors, suitable temperature, appropriate current density, etc., in order to seek the state that can achieve the best effect.
At the same time, with the continuous progress of characterization technology, the mechanism of action of corrosion inhibitors can be answered from a more novel and convincing perspective, in order to better apply them in practical work.