# US 9,518,316 B2 · Motor vehicle component

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- Number: US 9,518,316 B2
- Document ID: US9518316B2
- Status: Granted
- Kind: B2
- Application number: 14/604,174
- Filed: 2015-01-23
- Published: 2015-07-30
- Granted: 2016-12-13
- Earliest claimed: 2014-01-27
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: Heike Kantereit
- Web page: https://patentgrep.com/patent/US9518316B2

## CPC

- C23C 2/06: Zinc or cadmium or alloys based thereon
- C23C 2/022: {by heating}
- C23C 2/26: After-treatment (C23C2/14 takes precedence)
- Y10T 428/12965: Both containing 0.01-1.7% carbon [i.e., steel]
- 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 motor vehicle component, in particular body component, is disclosed in which a steel sheet has a corrosion protection coating arranged thereon. The steel sheet has a core with more than 90% of Martensite and an exterior zone with less than 90% Martensite. The corrosion protection coating is arranged on the exterior zone. A depth of this exterior zone amounts to at least 5 μm and/or at least 0.5% of a wall thickness of the steel sheet.

## Claims

### Claim 1

A motor vehicle component comprising a steel sheet having:
a core with more than 90% of Martensite,
an exterior zone with less than 90% of Martensite, and
a corrosion protection coating arranged on the exterior zone,
wherein a depth of the exterior zone is in a range between 5 μm and 6 μm or between 0.5% and 0.6% of a wall thickness of the steel sheet.

### Claim 2 (depends on 1)

The motor vehicle component according to claim 1, wherein the exterior zone comprises a decarburized zone with a carbon content which is no greater than 90% of a carbon content of the core.

### Claim 3 (depends on 1)

The motor vehicle component according to claim 1, wherein the corrosion protection coating comprises an alloying component of at least 50% of a metal, by volume or by weight, which compared with iron is electrochemically more ignoble.

### Claim 4 (depends on 3)

The motor vehicle component according to claim 3 wherein the alloying component is selected from the group consisting of a zinc-based alloying component and a magnesium-based alloying component.

### Claim 5 (depends on 1)

The motor vehicle component according to claim 1, wherein the motor vehicle component with the corrosion protection coating is hardened.

### Claim 6 (depends on 5)

The motor vehicle component according to claim 5, wherein the motor vehicle component is hardened and tempered.