Process for the preparation of a coated substrate, coated substrate, and use thereof
First Claim
1. Process for preparing a substrate with a multizone metallic coating comprising the steps of(i) heating a metallic material optionally comprising a metallic outer layer having a different composition than said metallic material to a temperature T1,(ii) at T1, depositing over a period of between 10 seconds and 12 minutes a coating of aluminium, magnesium, and/or zinc onto said metallic material via metal organic chemical vapour deposition using one or more metal-containing precursors selected from the group consisting of aluminium-containing precursors and/or magnesium-containing precursors and/or zinc-containing precursors, with T1 being a temperature at which the rate of diffusion of the deposited metal(s) and metal(s) of the metallic material and/or metallic outer layer is higher than or equal to the deposition rate of the deposited metal(s) but which is lower than the melting point of the metallic material or the metallic outer layer, or which is lower than the melting point of the formed metallic coating, whichever melting point is the lowest, with the proviso that the metal composition at the exterior of the metallic material is not identical to the composition of the deposited metal(s), and(iii) cooling down to a temperature T2 and continuing the deposition, with T2 being a temperature at which the rate of diffusion of the metals is lower than the deposition rate of the metal(s), but which is at least a temperature at which the deposition rate of the metal(s) being deposited is higher than 0.2 μ
- m per minute.
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Accused Products
Abstract
The invention relates to a process for preparing a substrate with a multizone metallic coating comprising the steps of heating a metallic material optionally comprising a metallic outer layer having a different composition than said metallic material, to a temperature T1, depositing a coating of aluminium, magnesium, and/or zinc, and cooling down to a temperature T2 and continuing the deposition. It furthermore relates to a substrate with a multizone metallic coating obtainable with said process.
68 Citations
12 Claims
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1. Process for preparing a substrate with a multizone metallic coating comprising the steps of
(i) heating a metallic material optionally comprising a metallic outer layer having a different composition than said metallic material to a temperature T1, (ii) at T1, depositing over a period of between 10 seconds and 12 minutes a coating of aluminium, magnesium, and/or zinc onto said metallic material via metal organic chemical vapour deposition using one or more metal-containing precursors selected from the group consisting of aluminium-containing precursors and/or magnesium-containing precursors and/or zinc-containing precursors, with T1 being a temperature at which the rate of diffusion of the deposited metal(s) and metal(s) of the metallic material and/or metallic outer layer is higher than or equal to the deposition rate of the deposited metal(s) but which is lower than the melting point of the metallic material or the metallic outer layer, or which is lower than the melting point of the formed metallic coating, whichever melting point is the lowest, with the proviso that the metal composition at the exterior of the metallic material is not identical to the composition of the deposited metal(s), and (iii) cooling down to a temperature T2 and continuing the deposition, with T2 being a temperature at which the rate of diffusion of the metals is lower than the deposition rate of the metal(s), but which is at least a temperature at which the deposition rate of the metal(s) being deposited is higher than 0.2 μ - m per minute.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A substrate having a multizone metallic coating comprising:
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(A) a metallic core, which is surrounded by (B) a multizone metallic coating comprising a zone (a) comprising (a1)) metal(s) of the metallic core, (a2) metal(s) originating from a metallic layer surrounding the metallic core, with the proviso that said metal(s) are less noble than the metallic material, which metal(s) have a gradual concentration change through this zone (a) with a concentration of less than 1 wt % at one end of the zone, a zone (b) comprising (b1) the metal(s) of the metallic core, (b2) the metal(s) of (a2), (b3) one or more metals selected from the group consisting of aluminium, magnesium, and zinc, with the proviso that said metal(s) are less noble than the metal(s) of the metallic material, which metal(s) have a gradual concentration change of aluminium, magnesium, and/or zinc through the zone (b) with a concentration of less than 1 wt % at one end of the zone, a zone (c) comprising (c1) the metal(s) of (a2), which metal(s) have a gradual concentration change through this zone (c) with less than 1 wt % concentration at one end of the zone, (c2) the metal(s) of (b3), and a zone (d) essentially consisting of the metal(s) of (b3). - View Dependent Claims (9, 10, 11, 12)
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Specification