An object comprising a chromium-based coating on a substrate
AssigneeSavroc Ltd
InventorJussi RÄISÄ
Life of this patent
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Abstract
An object including a chromium-based coating on a substrate and a method for its production are disclosed. The chromium-based coating having a first layer on the substrate, wherein the first layer has a top surface on the opposite side to the substrate and includes fissures within the first layer, and wherein the material of the first layer is predominantly formed of chromium and chromium carbide; the chromium-based coating further having a second layer on the first layer, the second layer at least partially filling the fissures in the first layer and at least partially covers the top surface of the first layer, wherein the material of the second layer is selected from a group consisting of: chromium oxide, carbon, and a combination of chromium oxide and carbon.
Claims14
An object comprising a chromium-based coating on a substrate,
- the chromium-based coating comprising a first layer on the substrate, wherein the first layer has a top surface on the opposite side to the substrate and comprises fissures within the first layer, wherein at least some of the fissures are surrounded by the material of the first layer, and wherein the material of the first layer is predominantly formed of chromium and chromium carbide;
- the chromium-based coating further comprising a second layer on the first layer, the second layer at least partially filling the fissures in the first layer and at least partially covers the top surface of the first layer, wherein the material of the second layer is selected from a group consisting of:
- chromium oxide, carbon, and a combination of chromium oxide and carbon.
A method for producing an object comprising a chromium-based coating on a sub-strate, wherein the method comprises:
- depositing a first layer comprising a top surface on the substrate by subjecting the substrate to at least two electroplating cycles from a trivalent chromium bath, wherein the first layer comprises fissures within the first layer, wherein at least some of the fissures are surrounded by the material of the first layer, and
- subjecting the first layer deposited on the substrate to at least one heat treatment at a temperature of 300-1200° C. to form a second layer on the first layer, to at least partially fill fissures in the first layer and to at least partially cover the top surface of the first layer,
- wherein the material of the first layer is predominantly formed of chromium and chromium carbide, and wherein the material of the second layer is selected from a group consisting of:
- chromium oxide, carbon, and a combination of chromium oxide and carbon.
Dependencies are inferred from the claim text.