A coated metallic substrate

Patent metadata

Field	Value
Publication number	US-2020190656-A1
Application number	US-201816642559-A
Country	US
Kind code	A1
Filing date	Jul 20, 2018
Priority date	Aug 30, 2017
Publication date	Jun 18, 2020
Grant date	—

Abstract

A coated metallic substrate including at least a first coating of aluminum, such first coating having a thickness below 5 μm and being directly topped by a second coating including from 0.5 to 5.9% by weight of magnesium, the balance being zinc.

First claim

What is claimed is:

1 - 20 . (canceled)

21 . A coated metallic substrate comprising:
a metallic substrate; and a first coating on the metallic substrate, the first coating consisting of aluminum and having a thickness between 2 and 4 μm and being directly topped by a second coating including from 0.5 to 5.9% by weight of magnesium, a balance of the second coating being zinc.

22 . The coated metallic substrate as recited in claim 21 wherein the second coating has a thickness between 1 and 10 μm.

23 . The coated metallic substrate as recited in claim 21 wherein the second coating comprises from 0.5 to 4.5% by weight of magnesium.

24 . The coated metallic substrate as recited in claim 23 wherein the second coating comprises from 0.5 to 2.0% by weight of magnesium, the balance being zinc.

25 . The coated metallic substrate as recited in claim 21 wherein the second coating comprises from 2.0 to 5.0% by weight of magnesium, the balance being zinc.

26 . The coated metallic substrate as recited in claim 21 wherein the second coating does not comprise at least one of the following elements chosen among: aluminum, silicon and copper.

27 . The coated metallic substrate as recited in claim 21 wherein the second coating consists of zinc and magnesium.

28 . The coated metallic substrate as recited in claim 21 wherein the microstructure of the second coating comprises less than 95% by weight of Mg2Zn11 phases in a Zn matrix.

29 . The coated metallic substrate as recited in claim 21 further comprising an intermediate layer between the metallic substrate and the first coating, the intermediate layer including iron, nickel, and chromium.

30 . The coated metallic substrate as recited in claim 29 wherein the intermediate layer further includes titanium.

31 . The coated metallic substrate as recited in claim 21 wherein the metallic substrate selected from one of the group consisting of: aluminum substrate, steel substrate, stainless steel substrate, copper substrate, iron substrate, copper alloys substrate, titanium substrate, cobalt substrate and nickel substrate.

32 . A method for the manufacture of the coated metallic substrate as recited in claim 20 , the method comprising the following steps:
providing the metallic substrate; depositing the first coating consisting of aluminum at a thickness between 2 and 4 μm; and depositing the second coating including from 0.5 to 5.9% by weight of magnesium, the balance being zinc.

33 . The method as recited in claim 32 further comprising preparing a surface of the metallic substrate after the providing step and before the depositing of the first coating.

34 . The method as recited in claim 33 wherein the preparing of the surface includes at least one of the following group consisting of: shot blasting, pickling, etching, polishing, sand blasting, grinding and deposition of an intermediate layer comprising iron, nickel, chromium and optionally titanium.

35 . The method as recited in claim 32 wherein the depositing of the first and second coatings occurs independently from each other and is performed by a hot-dip coating, by electro-deposition process or by vacuum deposition.

36 . The method as recited in claim 35 wherein the depositing of the first and second coating occurs by vacuum deposition, and the first and second coatings independently from each other are deposited by magnetron cathode pulverization process, jet vapor deposition process, electromagnetic levitation evaporation process or electron beam physical vapor deposition.

37 . A method for manufacturing an automotive vehicle part comprising: manufacturing the automotive vehicle part using the coated metallic substrate as recited in claim 21 .

38 . An installation for continuous vacuum deposition of coatings on a running metallic substrate to obtain the coated metallic substrate as recited in claim 20 comprising in the following order:
a first section including an electron beam evaporation device; and
a second section including a jet vapor evaporation device.

39 . The installation as recited in claim 38 further comprising an intermediate section including a magnetron cathode pulverization device upstream from the first section.

40 . The installation as recited in claim 39 wherein the magnetron cathode pulverization device includes a vacuum deposition chamber including one target made of iron, chromium, nickel and optionally titanium, and a plasma source to deposit an intermediate layer comprising iron, nickel, chromium and optionally titanium on the metallic substrate.

41 . The installation as recited in claim 38 wherein in the first section, the electron beam evaporation device includes a vacuum deposition chamber including an evaporation crucible incuding metal consisting of aluminum, a heating device and an electron gun.

42 . The installation as recited in claim 38 wherein in the second section, the jet vapor evaporation device includes a vacuum deposition chamber including a vapor jet coater and at least one evaporation crucible suited to feed the vapor jet coater with a vapor comprising from 0.5 to 5.9% by weight of magnesium, the balance being zinc.

Assignees

• Arcelormittal

Inventors

• Chaleix Daniel
• Allely Christian
• Silberberg Eric
• Pace Sergio
• Gaouyat Lucie

Classifications

• C23C28/025

  with at least one zinc-based layer · CPC title

• C23C14/24 Primary

  Vacuum evaporation · CPC title

• C23C2/026

  Deposition of sublayers, e.g. adhesion layers or pre-applied alloying elements or corrosion protection · CPC title

• C23C2/02

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence) · CPC title

• C23C2/024

  by cleaning or etching · CPC title