Method for making a braking band of a cast iron brake disc with increased resistance to wear and corrosion and braking band thus obtained

A method of making a braking band of a cast iron brake disc with increased resistance to wear and corrosion, comprising the following steps:

• a) make a braking band of a brake disc in cast iron, preferably in gray cast iron;
• b) immersing at least partially said braking band in molten aluminum maintained at a predefined temperature so that the molten aluminum covers at least a predefined surface region of said braking band, said immersion being prolonged for a predefined period of time so as to allow the diffusion of aluminum atoms in the surface microstructure of the cast iron with the consequent formation of iron-aluminum intermetallic compounds at a surface layer of said braking band, thereby generating in said predefined surface region of said braking band a layer consisting of iron-aluminum intermetallic compounds;
• c) extracting said braking band from the molten aluminum;
• d) removing the aluminum remained adherent on said braking band after extraction, so as to expose said layer of intermetallic Iron-Aluminum compounds on the surface,
• said layer of intermetallic Iron-Aluminum compounds exposed on the surface giving said cast iron braking band a higher resistance to corrosion and wear at said predefined surface region.