Tube for a heat exchanger and a method for manufacturing thereof

A heat exchanger configured to heat exchange between fluids comprising at least one tube including

• a tube structure made of lightweight metal alloy and including an inner surface and an outer surface,
• 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, wherein the first layer includes metallic material having a lower galvanic potential than the tube structure, wherein the first layer includes the deposition of zinc particles within the first layer, wherein the deposition of zinc is not less than 3 g/m2 and not more than 7 g/m2, and in that the second layer includes at least an aluminum silicon compound, wherein the deposition of aluminum silicon compound within the second layer is not less than 14 g/m2 and not more than 16 g/m2

The heat exchanger according to claim 13, wherein the heat exchanger further comprises manifolds, plurality of tubes including open ends received in said manifolds, and plurality of fins interlaced between the tubes, wherein at least one tube is fixed between the manifolds by brazing via second layer, so that the manifolds are fluidly connected.