Some explanations:

Anodising is the most common way of improving the corrosion resistance of aluminium. During this process the natural layer of oxide is thickened and compressed to 15-20 micron by electrolytic action. This gives a very hard corrosion-resistant layer which is fully transparant and allows the natural aluminium colour to show through.

For powder coating an electrostatic layer of 60-80 micron of polyurethane paint is applied to the aluminium. The necessity of cleaning is considerably less than for anodised aluminium. An extra advantage is that a repair to the powder coating can be carried out without removing the window.
Gebo ships’ windows are anodised or powder-coated after all machining, thereby preventing corrosion to tapped holes or sawn surfaces.
The operational life of powder-coated or anodised aluminium is increased by regular and correct cleaning.

More and more boat owners are having to replace the glazing on their boats with aluminium windows. Aluminium has a number of advantages over more costly materials such as stainless steel or brass. Most importantly, it allows greater flexibility in design and requires less maintenance.
For these reasons it is the most popular metal for manufacturing marine window frames.
Although bare untreated aluminium has a relatively good corrosion resistance, it is not recommended for a marine environment. To improve their corrosion resistance, aluminium windows are either anodised or powder-coated.

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