Abstract: A tube for a heat exchanger including a tube structure made of lightweight metal alloy and having an inner surface and an outer surface. The tube further includes: a first layer of material on the outer surface of the tube structure, the first layer having different chemical composition than the tube structure, a second layer of material on the first layer of material, the second layer having different chemical composition than the tube structure and the first layer. The first layer includes metallic material having a lower galvanic potential than the tube structure. The first layer includes the deposition of zinc particles within the first layer. The deposition of zinc is not less than 3 g/m2 and not more than 7 g/m2. The second layer includes an aluminum silicon compound. The deposition of aluminum silicon compound within the second layer is not less than 14 g/m2 and not more than 16 g/m2.