阅读说明：本技术 用于通过激光焊接制造组合件的方法 (Method for producing a composite part by laser welding ) 是由 马科斯·佩雷斯罗德里格斯 阿尔瓦罗·曼洪费尔南德斯 比尔希略·加西亚奥吉拉 西瓦桑布·博姆 于 2020-04-16 设计创作，主要内容包括：本发明涉及涂覆有以下的预涂覆钢基材：-任选地,防腐蚀涂层和-包含至少一种钛酸盐和至少一种纳米颗粒的预涂层,-所述钢基材在6.0μm至15.0μm的波长下的反射率高于或等于60％。(The present invention relates to a pre-coated steel substrate coated with: -optionally, an anti-corrosion coating and-a pre-coating comprising at least one titanate and at least one nanoparticle, -the reflectivity of the steel substrate at a wavelength of 6.0 μ ι η to 15.0 μ ι η is higher than or equal to 60%.)

1. A pre-coated steel substrate coated with:

optionally, an anti-corrosion coating and

-a pre-coating comprising at least one titanate and at least one nanoparticle,

-the reflectivity of the bare steel substrate at all wavelengths from 6.0 μ ι η to 15.0 μ ι η is higher than or equal to 60%.

2. The pre-coated steel substrate according to claim 1, wherein the at least one titanate is selected from the group consisting of: na (Na)₂Ti₃O₇、NaTiO₃、K₂TiO₃、K₂Ti₂O₅、MgTiO₃、SrTiO₃、BaTiO₃、CaTiO₃、FeTiO₃And ZnTiO₄Or mixtures thereof.

3. The pre-coated steel substrate according to any one of claims 1 or 2, wherein said at least one nanoparticle is selected from the group consisting of: TiO 2₂、SiO₂Yttria Stabilized Zirconia (YSZ), Al₂O₃、MoO₃、CrO₃、CeO₂Or mixtures thereof.

4. The pre-coated steel substrate according to any one of claims 1 to 3, wherein the thickness of the pre-coating layer is from 10 μm to 140 μm.

5. The pre-coated steel substrate according to any one of claims 1 to 4, wherein the percentage of nanoparticles is lower than or equal to 80 wt%.

6. The pre-coated steel substrate according to any one of claims 1 to 5, wherein the percentage of titanate is higher than or equal to 45 wt%.

7. The pre-coated steel substrate according to any one of claims 1 to 6, wherein said pre-coating layer further comprises a binder.

8. The pre-coated steel substrate according to claim 7, wherein the percentage of binder in the pre-coating layer is from 1 to 20 wt%.

9. The pre-coated steel substrate according to any one of claims 1 to 8, wherein the reflectance of the bare steel substrate at all wavelengths from 6.0 to 15.0 μm is higher than or equal to 70%.

10. The pre-coated steel substrate according to any one of claims 1 to 9, wherein the anti-corrosion coating comprises a metal selected from the group consisting of: zinc, aluminum, copper, silicon, iron, magnesium, titanium, nickel, chromium, manganese, and alloys thereof.

11. The pre-coated steel substrate according to any one of claims 1 to 10, wherein the diameter of the at least one titanate is from 1 to 40 μ ι η.

12. A process for manufacturing the pre-coated steel substrate according to any one of claims 1 to 11, comprising the following sequential steps:

A. providing a steel substrate having a reflectivity higher than or equal to 60% at all wavelengths from 6.0 μm to 15.0 μm, optionally coated with an anti-corrosion coating,

B. depositing a pre-coating comprising at least one titanate and at least one nanoparticle,

C. optionally, drying the coated steel substrate obtained in step B).

13. The method according to claim 12, wherein in step B) the deposition of the pre-coating is performed by spin coating, spray coating, dip coating or brush coating.

14. The method according to any one of claims 12 or 13, wherein in step B), the pre-coating layer further comprises an organic solvent.

15. The method according to any one of claims 12 to 14, wherein in step B) the pre-coating comprises 1 to 200g/L of at least one nanoparticle.

16. The method according to any one of claims 12 to 15, wherein in step B) the pre-coating comprises 100 to 500g/L of titanate.

17. The method according to any one of claims 12 to 16, wherein in step B) the pre-coating layer further comprises a binder precursor.

18. A method for manufacturing an assembly comprising the sequential steps of:

I. providing at least two metal substrates, wherein at least one metal substrate is a pre-coated steel substrate coated with a pre-coating comprising at least one titanate and at least one nanoparticle and the reflectance of the bare steel substrate of the pre-coated steel substrate at all wavelengths from 6.0 μm to 15.0 μm is higher than or equal to 60%, and

welding the at least two metal substrates by laser welding having a laser with a wavelength of 6.0 μm to 15.0 μm.

19. The method according to claim 18, wherein in step II) the laser welding is performed under a protective gas as inert gas and/or reactive gas.

20. The method according to any one of claims 18 or 19, wherein in step II) the power of the laser is 1kW to 20 kW.

21. An assembly of at least a first metal substrate and a second metal substrate, the first metal substrate being in the form of a pre-coated steel substrate according to any one of claims 1 to 11, the first metal substrate and the second metal substrate being at least partially welded together by laser welding, wherein the weld zone comprises a dissolved and/or precipitated pre-coating comprising at least one titanate and at least one nano-particle.

22. The assembly of claim 21, wherein the at least one nanoparticle is selected from the group consisting of: TiO 2₂、SiO₂Yttria Stabilized Zirconia (YSZ), Al₂O₃、MoO₃、CrO₃、CeO₂Or mixtures thereof.

23. The assembly of any one of claims 21 or 22, wherein the second metal substrate is a steel substrate or an aluminum substrate.

24. The assembly according to any one of claims 21 or 22, wherein the second metal substrate is a pre-coated steel substrate according to any one of claims 1 to 11.

25. Use of an assembly according to any of claims 21 to 24 for the manufacture of an automotive part or a shipbuilding part.

Examples

The following examples and tests are non-limiting in nature and must be considered for illustrative purposes only. The following examples and tests will illustrate the advantageous features of the invention, the importance of the parameters selected by the inventors after extensive experimentation, and also establish the properties that can be achieved by the invention.

For the test articles, steel substrates having the chemical composition disclosed in table 1 in weight percent were used:

C	Mn	Si	Al	S	P	Cu	Ni	Cr
									0.102	0.903	0.012	0.04	0.0088	0.012	0.027	0.0222	0.027

Nb	Mo	V	Ti	B	N	Fe
							0.0012	0.002	0.0011	0.0008	0.0001	0.0035	balance of

The steel substrate was 4mm thick.

The reflectivity of the steel substrate at a wavelength of 10.6 μm was 90%. These wavelengths are typically used in laser sources for CO2 laser welding.

Example 1:

test 1 was not coated.

For test 2, MgTiO was included₃(diameter: 2 μm), SiO₂(diameter: 10nm) and TiO₂An acetone solution (diameter: 50nm) was prepared by mixing acetone with the elements. In the acetone solution, MgTiO₃Has a concentration of 175g.L^-1。SiO₂Has a concentration of 25g.L^-1。TiO₂Has a concentration of 50g.L^-1. Then, the test piece 2 was coated with the acetone solution by spraying. The acetone was evaporated. MgTiO in coatings₃Is 70 wt.% SiO₂In an amount of 10 wt%, and TiO₂The percentage of (B) is 20% by weight. The coating thickness was 40 μm.

Then, the test pieces 1 and 2 were joined to the steel substrate having the above composition by laser welding. The welding parameters are in table 2 below:

after laser welding, the steel microstructure was analyzed by Scanning Electron Microscopy (SEM). The composition of the weld area was analyzed by energy dispersive X-ray spectroscopy (EDS). The reflectivity and residual stress of the weld area were determined by simulation. The results are in table 3 below:

*: according to the invention

The results show that trial 2 improves laser welding compared to comparative trial 1.

Example 2:

for test article 3, an aqueous solution was prepared comprising the following components: 363g.L^-1MgTiO of₃(diameter: 2 μm) 77.8g.L^-1SiO of (2)₂(diameter range: 12nm to 23nm), 77.8g.L^-1Of TiO 2₂(diameter range: 36nm to 55nm) and 238g.L^-13-aminopropyltriethoxysilane (fromProduced byAMEO). The solution is applied to a steel substrate and dried by 1) IR and 2) NIR. The dried coating was 40 μm thick and contained 62 wt.% MgTiO₃13% by weight of SiO₂13% by weight of TiO₂And 12% by weight of a binder obtained from 3-aminopropyltriethoxysilane.

For test 4, an aqueous solution was prepared comprising the following components: 330g.L^-1MgTiO of₃(diameter: 2 μm) 70.8g.L^-1SiO of (2)₂(diameter range: 12nm to 23nm), 70.8g.L^-1Of TiO 2₂(diameter range: 36nm to 55nm), 216g.L^-13-aminopropyltriethoxysilane (fromProduced byAMEO) and 104.5g.L^-1Organofunctional silanes and functionalized nanoscale SiO₂Composition of particles (produced by Evonik)Sivo 110). The solution is applied to a steel substrate and dried by 1) IR and 2) NIR. The dried coating was 40 μm thick and wrappedContaining 59.5 wt.% of MgTiO₃13.46% by weight of SiO₂12.8% by weight of TiO₂And 14.24% by weight of a binder obtained from 3-aminopropyltriethoxysilane and an organofunctional silane.

In all cases, the adhesion of the precoat to the steel substrate was greatly improved.