You might consider 100% polyurea. It has excellent sulfuric acid resistance and is a durable coating product. The key is surface preparation. If you can get the surface clean the polyurea will stick like all get out on the metal surface.
See - www.rapidcoating.com
We have coated the internal sections of waste water (RCRA) tanks with polyurea (100% polyurea aromatic) and have good success. Polyurea is a fast (less than 15 seconds) curing high performance coating. Highly chemical resistant. It exhibits high adhesion characteristics on steel, concrete, wood...
Coating aluminum with polyurea will give you a highly bonded polymer that can handle temperature range from -50 deg F up to + 350 deg F. The coating, when applied with special equipment, will cure in under 15 seconds, can be applied at thicknesses over 1/4 inch in a single step. The polyurea...