Which method is most commonly used for corrosion prevention in aluminum?

Anodizing is the most commonly used method for corrosion prevention in aluminum due to its ability to enhance the natural oxide layer on the surface of the metal. This process involves electrochemically treating aluminum in an acid solution, resulting in a thicker and more durable oxide layer. The anodized surface is not only resistant to corrosion but also provides improved surface hardness and can be dyed in various colors, which serves both functional and aesthetic purposes.

Anodizing creates a protective barrier that significantly limits further oxidation of the aluminum due to its inherent non-reactivity. This makes the aluminum more resistant to the elements and extends the lifespan of components used in aerospace applications, where durability and reliability are critical.

While painting can offer some level of protection, it does not provide the same durability and resistance to wear as anodizing does. Galvanizing, which involves coating steel with zinc, is not applicable to aluminum. Plating can also provide a protective layer, but it is less commonly used for aluminum compared to anodizing due to potential issues with adhesion and compatibility with the base material. Thus, anodizing remains the preferred choice for aluminum corrosion prevention in aerospace contexts.