# US 11,078,590 B2 · Plated steel

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- Number: US 11,078,590 B2
- Document ID: US11078590B2
- Status: Granted
- Kind: B2
- Application number: 16/620,599
- Filed: 2018-06-15
- Published: 2020-05-07
- Granted: 2021-08-03
- Earliest claimed: 2017-06-16
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Takashi Futaba; Kiyokazu Ishizuka; Fumio Shibao; Ikuo Kikuchi; Hidetoshi Shindo; Hiroaki Uramoto; Keita Katsumaru
- Web page: https://patentgrep.com/patent/US11078590B2

## CPC

- C25D 5/48: After-treatment of electroplated surfaces
- B32B 15/013: {one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium}
- B32B 15/04: comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)}
- B32B 15/043: {of metal (B32B15/01 takes precedence)}
- B32B 15/08: of synthetic resin
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- C23C 28/02: only coatings {only including layers} of metallic material
- C23C 28/023: {only coatings of metal elements only}
- C23C 28/025: {with at least one zinc-based layer}
- C23C 30/00: Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence)
- C23C 30/005: {on hard metal substrates}
- C25D 3/22: of zinc
- C25D 3/565: {containing more than 50% by weight of zinc}
- C25D 5/36: of iron or steel
- Y10T 428/12361: having aperture or cut
- Y10T 428/12396: Discontinuous surface component
- Y10T 428/12451: Macroscopically anomalous interface between layers
- Y10T 428/12472: Microscopic interfacial wave or roughness
- Y10T 428/12556: Organic component
- Y10T 428/12569: Synthetic resin
- Y10T 428/12799: Next to Fe-base component [e.g., galvanized]
- Y10T 428/12951: Fe-base component
- Y10T 428/12972: Containing 0.01-1.7% carbon [i.e., steel]
- Y10T 428/12979: Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
- Y10T 428/12993: Surface feature [e.g., rough, mirror]
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24967: Absolute thicknesses specified
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T 428/263: Coating layer not in excess of 5 mils thick or equivalent
- Y10T 428/264: Up to 3 mils
- Y10T 428/265: 1 mil or less
- Y10T 428/27: Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T 428/273: of coating
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A plated steel includes: a steel; a zinc based electroplated layer formed on a surface of the steel; and an organic resin coating layer formed on a surface of the zinc based electroplated layer, in which the surface of the zinc based electroplated layer has hairline extending in a predetermined direction, Ra (ML) measured on the surface of the zinc based electroplated layer is 0.10 to 0.70 μm, on the surface of the zinc based electroplated layer, a peak number PPI measured in a hairline orthogonal direction with a reference level of 10 μinch satisfies PPI≥350×Ra (MC) with respect to Ra (MC), on a surface of the organic resin coating layer, Ra (CC) satisfies Ra (CC)/Ra (CL)≥1.10 with respect to Ra (CL), and Ra (CC) satisfies Ra (CC)<Ra (MC) with respect to Ra (MC).

## Claims

### Claim 1

A plated steel comprising:
a steel;
a zinc based electroplated layer formed on a surface of the steel; and
an organic resin coating layer formed on a surface of the zinc based electroplated layer,
wherein the surface of the zinc based electroplated layer has hairline extending in a predetermined direction,
on the surface of the zinc based electroplated layer, a surface roughness Ra (ML) measured in an extension direction of the hairline is 0.10 to 0.70 μm,
on the surface of the zinc based electroplated layer, a peak number PPI measured in a direction orthogonal to the extension direction with a reference level of 10 μinch satisfies a relationship expressed by Formula (I) with respect to a surface roughness Ra (MC) measured in the direction orthogonal to the extension direction,
on a surface of the organic resin coating layer, a surface roughness Ra (CC) measured in the direction orthogonal to the extension direction satisfies a relationship expressed by Formula (II) with respect to a surface roughness Ra (CL) measured in the extension direction, and
the surface roughness Ra (CC) satisfies a relationship expressed by Formula (III) with respect to the surface roughness Ra (MC),
PPI≥350×Ra(MC) (I)
Ra(CC)/Ra(CL)≥1.10 (II)
Ra(CC)<Ra(MC) (III),
where, a unit of Ra(MC), Ra(CL) and Ra(CC) is μm.

### Claim 2 (depends on 1)

The plated steel according to claim 1, wherein an average thickness of the organic resin coating layer is 10 μm or less.

### Claim 3 (depends on 2)

The plated steel according to claim 2,
wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and
an average thickness of the organic resin coating layer is 1.0 μm or more.

### Claim 4 (depends on 2)

The plated steel according to claim 2,
wherein the surface roughness Ra (MC) is 1.00 μm or less.

### Claim 5 (depends on 2)

The plated steel according to claim 2,
wherein a substrate exposure ratio of the zinc based electroplated layer is less than 5%.

### Claim 6 (depends on 5)

The plated steel according to claim 5,
wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and
an average thickness of the organic resin coating layer is 1.0 μm or more.

### Claim 7 (depends on 6)

The plated steel according to claim 6:
wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and an average thickness of the organic resin coating layer is 1.0 μm or more,
the surface roughness Ra (MC) is 1.00 μm or less,
a coating weight of the zinc based electroplated layer is 10 g/m2 or more, and
a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

### Claim 8 (depends on 5)

The plated steel according to claim 5,
wherein the surface roughness Ra (MC) is 1.00 μm or less.

### Claim 9 (depends on 5)

The plated steel according to claim 5,
wherein a coating weight of the zinc based electroplated layer is 10 g/m2 or more.

### Claim 10 (depends on 5)

The plated steel according to claim 5,
wherein a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

### Claim 11 (depends on 2)

The plated steel according to claim 2,
wherein a coating weight of the zinc based electroplated layer is 10 g/m2 or more.

### Claim 12 (depends on 2)

The plated steel according to claim 2,
wherein a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.

### Claim 13 (depends on 1)

The plated steel according to claim 1,
wherein a minimum value of a thickness of the organic resin coating layer is 0.1 μm or more, and
an average thickness of the organic resin coating layer is 1.0 μm or more.

### Claim 14 (depends on 1)

The plated steel according to claim 1,
wherein the surface roughness Ra (MC) is 1.00 μm or less.

### Claim 15 (depends on 1)

The plated steel according to claim 1,
wherein a substrate exposure ratio of the zinc based electroplated layer is less than 5%.

### Claim 16 (depends on 1)

The plated steel according to claim 1,
wherein a coating weight of the zinc based electroplated layer is 10 g/m2 or more.

### Claim 17 (depends on 1)

The plated steel according to claim 1,
wherein a surface roughness Ra of the steel after removing the organic resin coating layer and the zinc based electroplated layer is 0.50 μm or less, where, the Ra is measured in a L direction.