In a process for coating a surface of a substrate with a metal layer zinc is used as a coating agent. Zinc metal and said substrate are brought together at an elevated temperature in a liquid diffusion medium to allow a diffusion of zinc through said diffusion medium to said surface of said substrate. Said diffusion medium comprises a molten salt liquid, particularly molten salt bath, of at least one salt that is maintained at a bath temperature of between 200° C. and 800° C. Said substrate and zinc as a coating agent are heat treated in said bath to promote said diffusion of zinc to said surface of said substrate.

In a process for coating a surface of a substrate with a metal layer zinc is used as a coating agent. Zinc metal and said substrate are brought together at an elevated temperature in a liquid diffusion medium to allow a diffusion of zinc through said diffusion medium to said surface of said substrate. Said diffusion medium comprises a molten salt liquid, particularly molten salt bath, of at least one salt that is maintained at a bath temperature of between 200° C. and 800° C. Said substrate and zinc as a coating agent are heat treated in said bath to promote said diffusion of zinc to said surface of said substrate.

An implant, in particular an intraluminal endoprosthesis, or a semi-finished part for an implant, having a hollow cylindrical body, wherein the body includes magnesium, and the body is enriched with gallium or a gallium alloy in a region close to a surface.

An implant, in particular an intraluminal endoprosthesis, or a semi-finished part for an implant, having a hollow cylindrical body, wherein the body includes magnesium, and the body is enriched with gallium or a gallium alloy in a region close to a surface.

A method for making a braking band of a cast iron brake disc with increased resistance to wear and corrosion, may have the following steps: a) making a braking band of a brake disc of cast iron, preferably gray cast iron; b) immersing at least partially the braking band in molten aluminum maintained at a predetermined temperature so that the molten aluminum covers at least a predetermined surface region of the braking band. Forming intermetallic iron-aluminum compounds at a surface layer of the braking band and generating a layer having of intermetallic iron-aluminum compounds in the predetermined surface region of the braking band. The method may also have the steps of c) extracting the braking band from the molten aluminum; and d) removing the aluminum remaining adherent on the braking band after extraction to expose the layer of intermetallic iron-aluminum compounds on the surface.

A method for making a braking band of a cast iron brake disc with increased resistance to wear and corrosion, may have the following steps: a) making a braking band of a brake disc of cast iron, preferably gray cast iron; b) immersing at least partially the braking band in molten aluminum maintained at a predetermined temperature so that the molten aluminum covers at least a predetermined surface region of the braking band. Forming intermetallic iron-aluminum compounds at a surface layer of the braking band and generating a layer having of intermetallic iron-aluminum compounds in the predetermined surface region of the braking band. The method may also have the steps of c) extracting the braking band from the molten aluminum; and d) removing the aluminum remaining adherent on the braking band after extraction to expose the layer of intermetallic iron-aluminum compounds on the surface.

A brake disc for disc brake comprises a braking band made of gray cast iron or steel, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc. The brake disc is provided with a base layer totally nickel-free and one or more carbides included in the nickel-free steel, which covers at least one of the two braking surfaces of the braking band. An intermediate layer composed of nickel-free steel is interposed between the base layer and at least one of the two braking surfaces of the braking band.

In a process for coating a surface of a substrate with a metal layer zinc is used as a coating agent. Zinc metal and said substrate are brought together at an elevated temperature in a liquid diffusion medium to allow a diffusion of zinc through said diffusion medium to said surface of said substrate. Said diffusion medium comprises a molten salt liquid, particularly molten salt bath, of at least one salt that is maintained at a bath temperature of between 200? C. and 800? C. Said substrate and zinc as a coating agent are heat treated in said bath to promote said diffusion of zinc to said surface of said substrate.

In a process for coating a surface of a substrate with a metal layer zinc is used as a coating agent. Zinc metal and said substrate are brought together at an elevated temperature in a liquid diffusion medium to allow a diffusion of zinc through said diffusion medium to said surface of said substrate. Said diffusion medium comprises a molten salt liquid, particularly molten salt bath, of at least one salt that is maintained at a bath temperature of between 200? C. and 800? C. Said substrate and zinc as a coating agent are heat treated in said bath to promote said diffusion of zinc to said surface of said substrate.

An implant, in particular an intraluminal endoprosthesis, or a semi-finished part for an implant, having a hollow cylindrical body, wherein the body includes magnesium, and the body is enriched with gallium or a gallium alloy in a region close to a surface.