Laser-based high-throughput surface nano-structuring (nhsn) process

Patent metadata

Field	Value
Publication number	US-2021237201-A1
Application number	US-202117175223-A
Country	US
Kind code	A1
Filing date	Feb 12, 2021
Priority date	Aug 21, 2017
Publication date	Aug 5, 2021
Grant date	—

Abstract

Embodiments of the present invention are directed to a surface modified metal piece comprising a first major surface, wherein at least one portion of the first major surface: comprises the reaction product of a surface modifier; has a random micro- and nanoscale structure; and has at least one of a water contact angle when exposed to water of at least about 120° and a spectral reflectance of less than about 25% within the visible spectrum. Other embodiments relate to processes and methods for making such a surface modified metal piece.

First claim

1 .- 22 . (canceled)

23 . A method of making a large-area nanostructured metal surface, the method comprising:
treating at least a portion of a first major surface of a metal piece along a laser scan path of a laser at a laser scanning time of at least about 0.25 seconds/in 2 , to obtain a treated metal surface along the laser scan path, the treated surface having random micro- and nanoscale structures along the laser scan path.

24 . The method of claim 23 , wherein the laser has a power intensity of greater than about 0.2 GW/cm 2 .

25 . The method of claim 23 , wherein the laser power intensity is from 0.2 GW/cm 2 to about 20 GW/cm 2 .

26 . The method of claim 23 , the method further comprising:
treating at least a portion of a first major surface of a metal piece in an aqueous medium.

27 . The method of claim 26 , the method further comprising:
removing the treated metal surface from the aqueous medium and immersing the treated metal surface in a solution comprising a surface modifier, wherein the surface modifier reacts with the treated metal surface to obtain a modified metal surface.

28 . The method of claim 27 , wherein the modified metal surface comprises the reaction product of a silane of the formula:
X 1 3 SiR 1
wherein each X 1 is halogen or a C 1 -C 6 -alkoxy group; and R 1 is a C 8 -C 20 -fluoro-substituted alkyl group; and
reactive sites on a major surface of the textured metal piece.

29 . The method of claim 28 , wherein R 1 is a group having the formula C n —F 2n+1 —(CH 2 ) 2 -(organofunctional group), wherein the organofunctional group is 1H, 2H, 2H-perfluoralkyl; and n is an integer from 8 to 20.

30 . The method of claim 23 , wherein the modified metal surface has at least one of a water contact angle when exposed to water of at least 120° and a spectral reflectance of less than 25% within the visible spectrum.

31 . The method of claim 23 , wherein the modified metal surface has a water contact angle when exposed to water of at least 150°.

32 . The method of claim 23 , wherein the at least one portion of a first major surface of the modified metal surface has a spectral reflectance of less than 60% within the IR-A spectrum.

33 . The method of claim 23 , wherein at least one portion of a first major surface of the modified metal surface has a spectral reflectance of less than 30% within the IR-A spectrum.

33 . The method of claim 23 , wherein the at least one portion of a first major surface of the modified metal surface has a spectral reflectance of less than 60% within the IR-B spectrum.

34 . The method of claim 23 , wherein the at least one portion of a first major surface of the modified metal surface has a spectral reflectance of less than 40% within the IR-B spectrum.

35 . The method of claim 23 , wherein the metal piece is made of steel, titanium, aluminum, magnesium, and alloys thereof.

36 . The method of claim 23 , wherein the metal piece is AISI 4130 steel, titanium Ti—6Al-4V alloy (Ti-6Al-4V), aluminum alloy 6061 alloy (AA-6061) or magnesium AZ31B alloy (Mg AZ31B).

Assignees

• Univ Iowa Res Found

Inventors

• Ding Hongtao
• Wang Qinghua
• Samanta Avik
• Shen Ninggang

Classifications

• B23K26/355 Primary

  Texturing · CPC title

• B05D3/06

  by exposure to radiation (B05D3/02 takes precedence {; plasma treatment B05D3/141}) · CPC title

• B05D7/14

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title

• B05D3/12

  by mechanical means · CPC title

• B05D1/18

  performed by dipping · CPC title