AlGa

AlGa (Aluminium-Gallium) is a degenerate alloy[clarification needed] that results from liquid gallium infiltrating the crystal structure of aluminium metal. The resulting alloy is very weak and brittle, being broken under the most minute pressure. The alloy is also chemically weaker, as the gallium inhibits the aluminium from forming a protective oxide layer. A video of gallium metal causing intergrain corrosion and breaking of aluminium can be found here.[1]

## Uses

The alloy can be reacted with water to form hydrogen gas (H
2), aluminium hydroxide and gallium metal.[2] Normally, aluminium does not react with water, since it quickly reacts in air to form a passivation layer of aluminium oxide. AlGa alloy is able to create aluminium nanoparticles for the hydrogen producing reaction.[3][4] Since this reaction forms hydrogen gas, it can be used as a source of fuel or simply as a hydrogen gas generator. This reaction can also be used to produce aluminium oxide from aluminium. As previously mentioned, aluminium normally won't react with water or air due to the presence of a protective passivation layer, but the reaction of suspended aluminium with water can effectively oxidize aluminum to form aluminium hydroxide which can then be heated to about 180 °C (356 °F), where it decomposes to produce aluminium oxide and water vapor.

## Safety concerns

Due to AlGa's extreme lack of structural integrity and inability to form a protective oxide layer, gallium metal is considered to be corrosive. If AlGa were to form on an aluminium structure, the aforementioned structure could weaken or collapse. Gallium is subject to strict packaging requirements for transportation by aircraft as it could compromise the integrity of the aluminium hull.[5]

## References

1. ↑ "This is what gallium does to aluminum". 8 March 2022. https://www.youtube.com/watch?v=z4TVnbuy4Lw.
2. ↑ "New process generates hydrogen from aluminum alloy to run engines, fuel cells". Phys.org. 2007-05-16. https://phys.org/news/2007-05-hydrogen-aluminum-alloy-fuel-cells.html.
3. ↑ "Easy aluminum nanoparticles for rapid, efficient hydrogen generation from water" (in en). ScienceDaily. https://www.sciencedaily.com/releases/2022/02/220218100644.htm.
4. ↑ Amberchan, Gabriella (2022-02-14). "Aluminum Nanoparticles from a Ga–Al Composite for Water Splitting and Hydrogen Generation". ACS Applied Nano Materials 5 (2): 2636–2643. doi:10.1021/acsanm.1c04331. ISSN 2574-0970.
5. ↑ "49 CFR § 173.162 - Gallium." (in en). https://www.law.cornell.edu/cfr/text/49/173.162.

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