Anodizing creates a non-conductive protective coating. To achieve maximum corrosion resistance, anodized particles are boiled in a solution of nickel acetate, which effectively seals the component. Aluminum component parts that have been welded will show some discoloration on the welds after it is anodized, even if the component has been polished or line-grained. It is important to use aluminum welding rods of the same alloy to minimize any color difference.
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