Aluminum doesn't rust in the same way as iron does, but it can still corrode. To protect aluminum sheets from corrosion, you can apply a protective coating such as a clear lacquer or a specialized aluminum paint. Regular cleaning and maintenance are also important to remove dirt and moisture that can lead to corrosion. Avoid using harsh chemicals that could damage the protective oxide layer naturally present on aluminum. In outdoor applications, ensure that the aluminum is not in contact with incompatible materials that could cause galvanic corrosion. Proper design and installation practices can also help in preventing corrosion.