Underpotential deposition of metal monolayers from ionic liquids

Patent metadata

Field	Value
Publication number	US-10195822-B2
Application number	US-201614996872-A
Country	US
Kind code	B2
Filing date	Jan 15, 2016
Priority date	May 14, 2012
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A metal article comprises an alloy substrate having a surface and a non-diffused metal monolayer disposed thereon. The surface has a first surface work function value Φ s . The non-diffused monolayer deposited on the surface has a second surface work function value Φ s that is less negative than the first surface work function value. A method for depositing the monolayer via underpotential deposition (UPD) is also disclosed.

First claim

The invention claimed is:

1. A metal article comprising:
an alloy substrate including a surface to be coated having a first surface work function value Φ s ; and
a plurality of monolayers including a non-diffused monolayer deposited on the surface of the alloy substrate, the first monolayer having a second surface work function value Φ d that is less negative than the first surface work function value Φ s .

2. The article of claim 1 , further comprising a bulk layer deposited atop at least one of the plurality of monolayers.

3. The article of claim 1 , wherein the surface of the alloy substrate is substantially free of surface adsorbed impurities between the substrate and the plurality of monolayers.

4. The article of claim 1 , wherein the surface of the alloy substrate has a selectively configured lattice orientation for increasing the first surface work function value Φ s as compared to non-coated surfaces of the alloy substrate.

5. The article of claim 4 , wherein the alloy substrate has a directionally solidified face centered cubic (FCC) microstructure.

6. The article of claim 5 , wherein the alloy substrate includes a majority by weight of aluminum.

7. The article of claim 6 , wherein the at least one surface to be coated is configured to be primarily along (100) lattice planes of the alloy substrate.

8. The article of claim 1 , wherein at least one of the plurality of monolayers consists of substantially pure aluminum.

9. The article of claim 1 , further comprising an interlayer disposed between the surface of the alloy substrate and the first monolayer, the interlayer being a different metal than the first monolayer and a base element of the alloy substrate.

10. The article of claim 2 , wherein the bulk layer is a substantially pure bulk aluminum layer deposited onto a substantially pure aluminum monolayer.

11. The article of claim 1 , wherein the surface to be coated is engineered to have a first surface work function value Φ s by selectively configuring the alloy substrate such that the surface to be coated has a surface work function value Φ s greater than work function values of at least one surface of the alloy substrate that is not to be coated by the plurality of monolayers.

12. The article of claim 2 , wherein the bulk layer is a substantially pure bulk aluminum layer deposited onto a substantially pure aluminum monolayer.

13. A metal article comprising:
an alloy substrate including a surface to be coated having a first surface work function value Φ s ;
an interlayer deposited on the surface to be coated;
a non-diffused first monolayer deposited on the interlayer, the first monolayer having a second surface work function value Φ d that is less negative than the first surface work function value Φ s ; and
a bulk layer deposited atop at least one of a plurality of monolayers, including the first monolayer.

14. The article of claim 13 , wherein the surface of the alloy substrate is substantially free of surface adsorbed impurities between the substrate and the plurality of monolayers.

15. The article of claim 13 , wherein the surface of the alloy substrate has a selectively configured lattice orientation for increasing the first surface work function value Φ s as compared to non-coated surfaces of the alloy substrate.

16. The article of claim 15 , wherein the alloy substrate has a directionally solidified face centered cubic (FCC) microstructure.

17. The article of claim 16 , wherein the alloy substrate includes a majority by weight of aluminum.

18. The article of claim 17 , wherein the at least one surface to be coated is configured to be primarily along (100) lattice planes of the alloy substrate.

19. The article of claim 13 , wherein at least one of the plurality of monolayers consists of substantially pure aluminum.

Assignees

• United Technologies Corp

Inventors

• Zhang Weilong
• Yu Xiaomei
• Chen Lei
• Jaworowski Mark R
• Sangiovanni Joseph J

Classifications

• Y10T428/12764

  Next to Al-base component · CPC title

• Y10T428/24942

  including components having same physical characteristic in differing degree · CPC title

• C23C28/02

  only coatings {only including layers} of metallic material · CPC title

• B32B15/016 Primary

  all layers being formed of aluminium or aluminium alloys · CPC title

• C25D5/44

  Aluminium · CPC title