On aluminum coating of steel by hot dipping ― Cf.: W. Deqing, S. Ziyuan, Z. Longjiang, "A liquid aluminum corrosion resistance surface on steel substrate", Applied Surface Science, 214(1-4), 2003, 304-311.
Pure aluminium may be coated on stainless steel by electrolysis. It is very simple and effective method by which the thickness of aluminium by varying volt, current and time. The bonding will be very strong.