1. Where aluminum surfaces may come in contact with metals other than stainless steel, zinc, cadmium or small areas of white bronze, keep aluminum surfaces from direct contact with incompatible metals.
    
   This is achieved by providing suitable protection coatings of paint, by using good quality caulking material between the surfaces, by using non-absorptive plastic or elastomeric tapes or gaskets, or in the case of steel, using a sufficiently thick galvanized coating. Coatings containing lead pigmentation must be avoided.
    
2. Steel anchors and other types of unexposed clips may be zinc or cadmium plated or finished with other suitable protective coating after fabrication.
    
3. Dissimilar metals should be painted if used in locations where drainage from them passes over aluminum.
    
4. Paint aluminum surfaces in contact with lime mortar, concrete or other masonry materials with alkali resistant coatings.

Taken/edited from
ANSI/AAMA/NWWDA
101/I.S.2.97