# US 10,865,483 B2 · Metal sheet having oiled Zn—Al—Mg coatings

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- Number: US 10,865,483 B2
- Document ID: US10865483B2
- Status: Granted
- Kind: B2
- Application number: 16/207,888
- Filed: 2018-12-03
- Published: 2019-06-06
- Granted: 2020-12-15
- Earliest claimed: 2012-04-25
- Assignees: ArcelorMittal
- Applicants: ArcelorMittal
- Inventors: Tiago Machado Amorim; Joelle Richard; Eric Jacqueson; Audrey Lhermeroult; Pascale Feltin; Jean-Michel Lemaire; Luc Diez; Jean-Michel Mataigne
- Web page: https://patentgrep.com/patent/US10865483B2

## CPC

- C23C 28/345: {with at least one oxide layer}
- C23G 1/12: Light metals
- C23C 2/06: Zinc or cadmium or alloys based thereon
- C23C 2/26: After-treatment (C23C2/14 takes precedence)
- C23C 22/06: using aqueous acidic solutions with pH less than 6
- C23C 22/53: Treatment of zinc or alloys based thereon
- C23C 22/82: After-treatment
- C23C 28/321: {with at least one metal alloy layer}
- Y10T 428/12549: Adjacent to each other
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A metal sheet is provided. The metal sheet includes a substrate having two faces, each face hot dip coated with a metal coating of zinc, aluminum and magnesium. The metal coatings include between 0.1 and 20 wt % of aluminum and 0.1 and 10 wt % of magnesium. Layers of magnesium oxide or magnesium hydroxide are formed on outer surfaces of the metal coatings. The layers are altered by applying an acid solution on the outer surfaces of the metal coatings or by applying mechanical forces using a roller leveler, a brushing device, or a shot-blasting device on the outer surfaces of the metal coatings. The metal sheet also includes a layer of oil deposited directly on the outer surfaces of the metal coatings.

## Claims

### Claim 1

A metal sheet comprising:
a substrate having two faces, each face hot dip coated with a metal coating comprising zinc, aluminum and magnesium, the metal coatings comprising between 0.1 and 20 wt % of aluminum and 0.1 and 10 wt % of magnesium;
layers of magnesium oxide or magnesium hydroxide formed on outer surfaces of the metal coatings, the layers being altered by applying mechanical forces using a roller leveler, a brushing device, or a shot-blasting device on the outer surfaces of the metal coatings,
wherein the layers of magnesium oxide or magnesium hydroxide are cracked by applying mechanical forces on the outer surfaces of the metal coatings; and
a layer of oil deposited directly on the outer surfaces of the metal coatings having altered layers of magnesium oxide or magnesium hydroxide.

### Claim 2 (depends on 1)

The metal sheet according to claim 1, wherein the mechanical forces are applied by passing the metal sheet through a roller leveler.

### Claim 3 (depends on 1)

The metal sheet according to claim 1, wherein the metal coatings comprise between 0.3 and 10 wt % of magnesium.

### Claim 4 (depends on 3)

The metal sheet according to claim 3, wherein the metal coatings comprise between 0.3 and 4 wt % of magnesium.

### Claim 5 (depends on 1)

The metal sheet according to claim 1, wherein the metal coatings comprise between 0.5 and 11 wt % of aluminum.

### Claim 6 (depends on 5)

The metal sheet according to claim 5, wherein the metal coatings comprise between 0.7 and 6 wt % of aluminum.

### Claim 7 (depends on 1)

The metal sheet according to claim 1, wherein a weight ratio between the magnesium and the aluminum in the metal coatings is less than or equal to 1.

### Claim 8 (depends on 1)

The metal sheet according to claim 1, wherein the sheet is degreased by applying an alkaline solution on the outer surfaces of the metal coatings.