A coated component includes a metallic body defining an inner volume configured to retain a fluid therein. The metallic body includes a plurality of segments, at least one weld joint attaching the plurality of segments, an outer surface, and an inner surface facing and defining the inner volume. The component further includes a chrome-free protective coating disposed on each of the outer surface and the inner surface. The coating includes an epoxy layer, and an oxide layer disposed between the epoxy layer and the respective outer surface and inner surface.

Disclosed is a method of treating a surface of an aluminum material, the method including: degreasing an aluminum material; etching the degreased aluminum material; performing a first desmutting treatment by immersing the etched aluminum material in a 25-35 wt % nitric acid solution at a temperature in a range of 25 to 30 C. for at least 60 seconds; performing a second desmutting treatment by immersing the first desmutting-treated aluminum material in a 5-15 wt % nitric acid solution at a temperature in a range of 25 to 30 C. for a time in a range of 30 seconds to 60 seconds; anodizing the second desmutting-treated aluminum material; coloring the anodized aluminum material; and sealing the colored aluminum material.