I work for a Curtain Wall engineering company. We use a lot of aluminum extrusions and often we have to have them reinforced with structural steel angles or rectangular steel tubing. The aluminum shapes are hollow and we put the steel inside, where the aluminum has no protective finish. Some builders specify wrapping the steel with tape or a bituminus coating before anchoring it in place. We usually specify Dril-Flex fasteners through the side of the aluminum extrusion. Here's my question: We have been using only a red oxide paint coating on the steel for some builders. Is this a sufficient barrier to prevent corrosion of the aluminum?
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