Coating, substrate provided with a coating and method for the application of a corrosion-resistant coating
AssigneeNetherlands Institute for Metals Research
InventorsIan John Bennet, Willem Gerrit Sloof
Life of this patent
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Abstract
Substrate such as a turbine blade provided with a coating, which consists of a material that forms a sealing oxide skin on heating. This material is a ferrous metal aluminium alloy or a ferrous metal chromium alloy, wherein the oxide skin comprises aluminium oxide or chromium oxide. In order to optimise the adhesion between the skin and the coating, it is proposed that a metal from the platinum group such as platinum or palladium be added in an amount of 0.1-0.5% (m/m). It has been found that better adhesion is obtained with this method and the detrimental effects of sodium, potassium or calcium are counteracted.
Claims10
1-9. (canceled)
Coating comprising a ferrous metal aluminium or ferrous metal chromium alloy, said alloy forming an aluminium oxide or chromium oxide skin, respectively, on contact with oxygen, said skin being impermeable to oxygen said coating comprising an alloy with a homogeneous composition containing sodium, potassium or calcium as well as 0.1-0.5% (m/m) of a metal from the platinum group and an oxide layer of said alloy adjacent thereto.
Substrate comprising a support and a protective layer applied thereon, wherein said protective layer comprises solely a coating comprising a ferrous metal aluminium or ferrous metal chromium alloy, said alloy forming an aluminium oxide or chromium oxide skin, respectively, on contact with oxygen, said skin being impermeable to oxygen said coating comprising an alloy with a homogeneous composition containing sodium, potassium or calcium as well as 0.1-0.5% (m/m) of a metal from the platinum group and an oxide layer of said alloy adjacent thereto.
Method for the application of a corrosion-resistant protective layer to a substrate, comprising deposition of a coating on said substrate, which coating comprises a ferrous metal aluminium alloy, a ferrous metal chromium alloy, which alloy forms an aluminium oxide or chromium oxide skin, respectively, on contact with oxygen, which skin is impermeable to oxygen, wherein only a single coating is deposited on said substrate, wherein the alloy of said coating contains 0.1-0.5% (m/m) of a metal from the platinum group and sodium, potassium or calcium.
Dependencies are inferred from the claim text.