Unlike ordinary steel sheets, Aluminized steel sheets have a thin aluminum coating on both sides of the steel. When this layer of aluminum is applied, it protects the steel from various corrosion effects, keeps it from rusting, and protects it from damage caused by acidic or alkaline substances. Several procedures, including cladding, hot dipping, galvanic coating, metallizing, and calorizing, may be used to produce aluminized steel, but the most effective approach is hot dipping.
There are two layers of steel, one on each side of the aluminum. This means that the aluminum coating is not directly bonded to the steel. Aluminum is a very soft metal and thus cannot be easily attached to steel. So, what happens is that the steel sheet has two aluminum coatings. The first aluminum layer is usually applied as an electrolytic deposition process. This chemical process results in a coating layer of approximately 50-200 nm thickness. The other aluminum layer is also applied chemically. This is done with aluminum powder.