I'd not thought of the oxidation so I've done a quick search as to the properties of Aluminium used in beverage containers and found this:
What about that beer can? State-of-the-art machines are capable of making over 3,000 beverage cans per minute, which contributes to a U.S. production of more than 100 billion cans per year. The chosen sheet metal needs to be soft enough to accommodate this manufacturing volume and speed, but strong enough to withstand filling, shipping, and stacking.
A beverage can body usually is made from AA3004. Alloys from the 3XXX series have about 1 percent manganese (Mn) added, but AA3004 also has 1 percent magnesium (Mg) for further strengthening that allows the finished can to maintain sufficient integrity with the thinnest possible wall. The incoming sheet aluminum starts at about 250 microns, or 0.01 inch. After forming with a draw and wall ironed (DWI) operation, beer can bodies have a wall thickness of 100 microns (0.004 in.) at their thinnest point.
The tops need to be stronger to open properly and consistently using the riveted pull tabs. To get the higher strength, it’s necessary to use a different alloy family—5XXX. AA5182 has 4.5 percent Mg and 0.3 percent Mn as the main alloying additions, which provide a balance between high strength and formability. The incoming aluminum stock is about the same thickness as the body metal (250 microns), but does not go through the same degree of work hardening as the can walls do during the DWI process. As such, the part strength and finished thickness of the lids are not significantly different from the incoming coil. To minimize the weight and increase the stiffness, the top of the can body is necked down so the lid does not have to be the same diameter as the majority of the body.
A bit more digging found this:
Does Aluminum Alloy Rust?
Aluminum and its alloys are resistant to corrosion. Although aluminum is naturally resilient, its resistance decreases with the addition of more alloys. Aluminum’s resistance to corrosion is due to oxidation. When new aluminum surfaces come into contact with air or other oxidizing agents, a thin, hard aluminum oxide film forms, protecting it from corrosion. However, it’s important to note that aluminum is not completely immune to corrosion and can corrode under certain conditions.
Which Alloys Have the Best Corrosion Resistance?
1xxx
Alloy 1100: Aluminum grade 1100 is commercially pure aluminum. It has excellent corrosion resistance and is common in the chemical and food processing industries. Otherwise, it is a soft and ductile metal with excellent workability. You’ll find alloy 1100 frequently in applications that require forming. It can be welded with any method, but it is non-heat-treatable.
3xxx
Alloy 3003: Alloy 3003 is the most common of the aluminum alloys. It is pure, commercial-grade aluminum with a 20% boost in strength thanks to the addition of Manganese and Copper. It also has excellent corrosion resistance, workability, and can be welded or brazed, drawn or spun.
5xxx
Alloy 5052: 5052 is also a very popular alloy because it has the highest strength of any of the non-heat-treatable grades. It is especially common in marine and saltwater atmospheres because of its resistance to corrosion. It has excellent workability and is easily drawn or formed into complex shapes.
6xxx
Alloy 6061: 6061 is the most versatile of the heat-treatable alloys, including corrosion resistance, workability when annealed, and weldability. You’ll find alloy 6061 in products and applications that require a trifecta of good appearance, better corrosion resistance, and good strength.
Alloy 6063: 6063 is usually known as an architectural alloy because of its high tensile, great finishing, and high corrosion-resistant properties. You’ll find 6063 in interior and exterior architectural settings and trims. It is frequently anodized.
In my extensive research into beer I've found that some brands use stick on labels, some of them are true works of art, others use a sort of adhesive paint. I've used the labels from a couple of my favourite brews to add a bit of decoration to a couple of my Brommies. They're easy to apply and remove so I can ring the changes if I see something that I find appealing.
