Process for coating a surface of a substrate with a metal layer
AssigneeSherart B.V.
InventorFrank Vitus Franz Natrup
Life of this patent
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Abstract
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.
Claims25
A process for coating a surface of a substrate with a metal layer, said process comprising:
- bringing together a coating agent containing zinc and said substrate in a diffusion medium and
- subjecting the coating agent and said substrate to a heat treatment at an elevated temperature to allow a diffusion of zinc through said diffusion medium to said surface of said substrate,
- wherein said diffusion medium consisting of a molten salt comprising at least one molten salt,
- wherein said coating agent comprises a metallic zinc source as a source for diffusion of zinc to said surface of said substrate, and
- wherein said heat treatment includes submerging said substrate in said molten salt at said elevated temperature to allow metallic zinc to diffuse to said substrate.
Dependencies are inferred from the claim text.