Metal Sheet Assembly having Zn-Al-Mg Coatings, an Acid Solution Application and an Adhesive

Patent metadata

Field	Value
Publication number	US-2019105889-A1
Application number	US-201816208216-A
Country	US
Kind code	A1
Filing date	Dec 3, 2018
Priority date	Apr 25, 2012
Publication date	Apr 11, 2019
Grant date	—

Abstract

A metal sheet assembly is provided. The metal sheet assembly includes a first metal sheet having two faces, each face is hot dip coated with a metal coating comprising zinc, from 0.7 to 6 wt % of aluminum and from 0.1 to 10 wt % of magnesium. An acid solution with a pH from 1 to 4 is applied to outer surfaces of the metal coatings. An adhesive locally is applied on at least one acid solution-treated outer surface of the metal coating, the adhesive is selected from structural, reinforced structural or semi-structural adhesives, sealing putties and wedging putties. A second metal sheet is assembled to the first metal sheet via the adhesive.

First claim

What is claimed is:

1 . A metal sheet assembly comprising:
a first metal sheet having two faces, each face hot dip coated with a metal coating comprising zinc, from 0.7 to 6 wt % of aluminum and from 0.1 to 10 wt % of magnesium; an acid solution with a pH from 1 to 4 applied to outer surfaces of the metal coatings; an adhesive locally applied on at least one acid solution-treated outer surface of the metal coating, the adhesive being selected from structural, reinforced structural or semi-structural adhesives, sealing putties and wedging putties; and a second metal sheet assembled to the first metal sheet via the adhesive.

2 . The metal sheet assembly according to claim 1 , wherein the metal coatings comprise from 0.3 to 10 wt % of magnesium.

3 . The metal sheet assembly according to claim 2 , wherein the metal coatings comprise from 0.3 to 4 wt % of magnesium.

4 . The metal sheet assembly according to claim 1 , wherein the metal coatings comprise from 1 to 6 wt % of aluminum.

5 . The metal sheet assembly 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.

6 . The metal sheet assembly according to claim 1 , wherein the acid solution is applied during a duration of from 0.2 s to 30 s on the outer surfaces of the metal coatings.

7 . The metal sheet assembly according to claim 6 , wherein the acid solution is applied during a duration of from 0.5 s and 15 s on the outer surfaces of the metal coatings.

8 . The metal sheet assembly according to claim 1 , wherein the acid solution is a surface treatment solution for forming layers improving the corrosion resistance or adherence on the outer surfaces.

9 . The metal sheet assembly according to claim 1 , further comprising a surface treatment solution applied on the acid solution-treated outer surfaces of the metal coatings to form layers improving the corrosion resistance or adherence.

10 . The metal sheet assembly according to claim 8 , wherein the surface treatment solution is a conversion solution.

11 . The metal sheet assembly according to claim 1 , further comprising an alkaline solution applied on the outer surfaces of the metal coatings to degrease the first metal sheet.

12 . The metal sheet assembly according to claim 1 , wherein the acid solution has a pH from 1 to 3.5.

13 . The metal sheet assembly according to claim 12 , wherein the acid solution has a pH from 1 to 3.

14 . The metal sheet assembly according to claim 13 , wherein the acid solution has a pH from 1 to 2.

15 . The metal sheet assembly according to claim 1 , wherein the acid solution includes a silane.

16 . The metal sheet assembly according to claim 15 , wherein the silane is chosen from 3-aminopropyltrimethoxysilane and (3-glycidoxypropyl)triethoxysilane.

17 . The metal sheet assembly according to claim 1 , having a break facies after a traction test of at least 25% surface cohesive break.

18 . The metal sheet assembly according to claim 1 , wherein the acid solution is hydrochloric acid, phosphoric acid, hexaflourotitanic acid or a hexafluorozirconic acid-based solution.

19 . The metal sheet assembly according to claim 11 , wherein the degreasing is non-oxidizing.

20 . The metal sheet assembly according to claim 1 , wherein the acid solution is free of chromium, cobalt and nickel.

Assignees

• Arcelormittal

Inventors

• Richard Joëlle
• Jacqueson Eric
• Lhermeroult Audrey
• Feltin Pascale
• Lemaire Jean-Michel

Classifications

• C23C2/06 Primary

  Zinc or cadmium or alloys based thereon · CPC title

• C23C22/53

  Treatment of zinc or alloys based thereon · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• C23C2222/20

  Use of solutions containing silanes · CPC title

• B32B15/012 Primary

  one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy · CPC title