Coated metallic substrate

Patent metadata

Field	Value
Publication number	US-12331216-B2
Application number	US-201917058087-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Jun 15, 2018
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

A metallic substrate directly coated with a non-conductive primer, the non-conductive primer being at least partially coated with a paint, a method for the manufacture of this coated metallic substrate, a method for detecting strain deformation and the use the coated metallic substrate.

First claim

What is claimed is:

1. A coated metallic substrate comprising: a metallic substrate directly coated with a non-conductive primer, the non-conductive primer being at least partially coated on at least one side with a paint including reduced graphene oxide and a thermosetting polymer, the reduced graphene having ketone groups, carboxyl groups, epoxy groups and hydroxyl groups.

2. The coated metallic substrate as recited in claim 1 wherein a lateral size of the reduced graphene oxide is between 1 and 80 μm.

3. The coated metallic substrate as recited in claim 1 wherein a weight percentage of oxygen in the reduced graphene oxide is between 2 and 20%.

4. The coated metallic substrate as recited in claim 1 wherein a concentration of the reduced graphene oxide in the paint is between 0.05 and 10% by weight.

5. The coated metallic substrate as recited in claim 1 wherein the thermosetting polymer is chosen from at least one of the group consisting of: epoxy resin, Polyester resin, Polyurethanes, Polyurea/polyurethane, Vulcanized rubber, Urea-formaldehyde, Melamine resin, Benzoxazines, Polyimides, Bismaleimides, Cyanate esters, polycyanurates, Furan, Silicone resins, Thiolyte and Vinyl ester resins and a mixture thereof.

6. The coated metallic substrate as recited in claim 1 wherein the non-conductive primer is made of at least one polymer.

7. The coated metallic substrate as recited in claim 6 wherein the polymer is chosen from at least one of the group consisting of: Poly(methyl methacrylate), epoxy resin, Polyester resin, Polyurethanes, Polyurea/polyurethane, Vulcanized rubber, Urea-formaldehyde, Melamine resin, Benzoxazines, Polyimides, Bismaleimides, Cyanate esters, polycyanurates, Furan, Silicone resins, Thiolyte and Vinyl ester resins and a mixture thereof.

8. The coated metallic substrate as recited in claim 1 wherein the metallic substrate is chosen from at least one of the group consisting of: aluminum, steel, stainless steel, copper, iron, copper alloys, titanium, cobalt, metal composite or nickel and a mixture thereof.

9. The coated metallic substrate as recited in claim 1 wherein the non-conductive primer is coated with paint strips to form an alternation between painted and non-painted non-conductive primer.

10. The coated metallic substrate as recited in claim 1 wherein the reduced graphene oxide has a surface area below 300 m 2 ·gr −1 .

11. The coated metallic substrate as recited in claim 1 wherein the reduced graphene oxide has a surface area below 290 m 2 ·gr −1 .

12. The coated metallic substrate as recited in claim 1 wherein the reduced graphene oxide has a surface area above 200 m 2 ·gr −1 and below 290 m 2 ·gr −1 .

13. The coated metallic substrate as recited in claim 1 , wherein conductivity of the coated metallic substrate is from 2.1×10 −7 to 1.5×10 −1 S/m.

14. The coated metallic substrate as recited in claim 13 , wherein electrical resistance of the coated metallic substrate is between 6.7×10 4 and 4.8×10 10 Ω/sq.

15. A method for manufacture of the coated metallic substrate as recited in claim 1 , the method comprising the successive following steps:
A. depositing a non-conductive primer on the metallic substrate;
B. depositing a mixture including the reduced graphene oxide, the thermosetting monomer, a curing agent and optionally a solvent on the non-conductive primer previously deposited on the metallic substrate; and
C. curing the mixture.

16. The method as recited in claim 15 wherein in step B), the solvent is chosen from at least one of the group consisting of: xylene, n-butanol, ethylbenzene, naphtha, n-butyl acetate, toluene, isopropanol, cyclic hydrocarbons and benzyl alcohol and a mixture thereof.

17. The method as recited in claim 15 wherein in step B), the curing agent is chosen from at least one of the group consisting of: polyamide, phenols, amines and polyaddition isocyanate.

18. A method for detecting a strain deformation with the coated metallic substrate as recited in claim 1 , the method comprising the following successive steps:
applying an electrical voltage to the coated metallic substrate using an electronic system; and
measuring an electrical resistance variation after deformations of the coated metallic substrate.

19. The method as recited in claim 18 wherein the electronic system includes a power supply system.

20. A coated metallic substrate comprising: a metallic substrate directly coated with a non-conductive primer, the non-conductive primer being at least partially coated on at least one side with a paint including reduced graphene oxide and a thermosetting polymer, wherein the reduced graphene oxide is in a form of one or more nanoplatelets.

21. The coated metallic substrate as recited in claim 20 , wherein a concentration of the reduced graphene oxide in the paint is between 0.5 and 4% by weight.

22. The coated metallic substrate as recited in claim 21 , wherein a weight percentage of oxygen in the reduced graphene oxide is between 2 and 10%.

23. The coated metallic substrate as recited in claim 21 , wherein electrical resistance of the coated metallic substrate is between 6.7×10 4 and 4.8×10 10 Ω/sq.

24. The coated metallic substrate as recited in claim 20 , wherein electrical resistance of the coated metallic substrate is between 6.7×10 4 and 4.8×10 10 Ω/sq.

25. The coated metallic substrate as recited in claim 20 , wherein a gauge factor of the coated metallic substrate is above 5.

26. The coated metallic substrate as recited in claim 20 , wherein a lateral size of the nanoplatelets is between 1 and 80 μm.

27. The coated metallic substrate as recited in claim 20 , wherein conductivity of the coated metallic substrate is from 2.1×10 −7 to 1.5×10 −1 S/m.

Assignees

• Arcelormittal

Inventors

• Alvarez-Alvarez Abel
• Perez Vidal Oscar
• Rodriguez Martinez Carlos Javier
• NORIEGA PEREZ David
• Fernandez Alvarez Jose Paulino

Classifications

• G01B7/18

  using change in resistance · CPC title

• C09D163/00

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C09D133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• B05D7/542

  the two layers being cured or baked together · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title