Metal material hydrophobic surface treatment methods

Patent metadata

Field	Value
Publication number	US-2020199731-A1
Application number	US-201816229199-A
Country	US
Kind code	A1
Filing date	Dec 21, 2018
Priority date	Dec 21, 2018
Publication date	Jun 25, 2020
Grant date	—

Abstract

A method for treating a metal material to make a surface portion hydrophobic. The method includes oxidizing an untreated surface portion of the metal material to form an oxidized surface portion. The untreated surface portion has metal atoms. The oxidizing step forming bonds between the metal atoms and oxygen atoms. The method further includes doping the oxidized surface portion with a liquid containing a fluorine-containing salt to form a fluorinated surface portion. The doping step forming bonds between fluorine atoms and at least a portion of the metal atoms and the oxygen atoms. The fluorinated surface portion is hydrophobic.

First claim

What is claimed is:

1 . A method for treating a metal material comprising:
oxidizing an untreated surface portion of the metal material to form an oxidized surface portion, the untreated surface portion having metal atoms, and the oxidizing step forming bonds between the metal atoms and oxygen atoms; and doping the oxidized surface portion with a liquid containing a fluorine-containing salt to form a fluorinated surface portion, the doping step forming bonds between fluorine atoms and at least a portion of the metal atoms and the oxygen atoms, and the fluorinated surface portion being hydrophobic.

2 . The method of claim 1 , wherein the metal material is a stainless steel alloy.

3 . The method of claim 1 , wherein the untreated surface portion has a thickness of 20 nm to 20 μm.

4 . The method of claim 1 , wherein the liquid is an organic solvent.

5 . The method of claim 1 , wherein the oxidizing step includes heating the untreated surface portion at an elevated temperature for a period of time.

6 . The method of claim 5 , wherein the elevated temperature is 600 to 1000° C. and the period of time is 1 to 2 hours.

7 . The method of claim 1 , wherein the oxidizing step includes immersing the metal material in an aqueous bath of an acid at a temperature for a period of time.

8 . The method of claim 7 , wherein the acid is nitric or sulfuric acid.

9 . The method of claim 7 , wherein the temperature is 0 to 120° C. and the period of time is 2 to 10 hours.

10 . The method of claim 1 , wherein the oxidizing step includes oxygen plasma treating the untreated surface portion.

11 . The method of claim 1 , wherein the doping step includes immersing the metal material in a fluorination agent including an organic solvent including a fluorine-containing salt.

12 . A method for treating a metal material comprising:
selecting a depth of an untreated surface portion of the metal material based on a threshold concentration of a metal material combination including chromium atoms and nickel atoms in the untreated surface portion; oxidizing the untreated surface portion to form an oxidized surface portion by forming bonds between at least a portion of the chromium atoms and nickel atoms in the metal material combination and oxygen atoms; and doping the oxidized surface portion with a liquid containing a fluorine-containing salt to form a fluorinated surface portion, the doping step forming bonds between fluorine atoms and at least a portion of the chromium atoms and the nickel atoms in the metal material combination and the oxygen atoms, and the fluorinated surface portion being hydrophobic.

13 . The method of claim 12 , wherein the metal material combination further includes molybdenum and/or manganese.

14 . The method of claim 12 , wherein the contact angle of the fluorinated surface portion is greater than or equal to 90°.

15 . The method of claim 12 , wherein the contact angle of the oxidized surface portion is less than 90°.

16 . A hydrophobic metal material comprising:
a surface region and a bulk region, the surface region having greater than or equal to a threshold concentration of chromium atoms and nickel atoms, the bulk region having less than the threshold concentration of the chromium atoms and nickel atoms, at least a first portion of the chromium atoms and nickel atoms of the surface region bonded to oxygen atoms, and at least a second portion of the chromium atoms, nickel atoms, and oxygen atoms bonded to fluorine atoms such that the surface region is hydrophobic.

17 . The hydrophobic metal material of claim 16 , wherein the metal material is a stainless steel alloy.

18 . The hydrophobic metal material of claim 16 , wherein the concentration in the surface region is 0 to 10 percent by mol fluorine, 50 to 60 percent by mol oxygen and 40 to 50 percent by mol metal elements.

19 . The hydrophobic metal material of claim 16 , wherein a water contact angle of the surface region is greater than or equal to 90°.

20 . The hydrophobic metal material of claim 16 , wherein surface region has a thickness of 20 nm to 20 μm.

Assignees

• Bosch Gmbh Robert

Inventors

• Cheng Lei
• Kim Soo
• Kornbluth Mordechai
• Mailoa Jonathan
• Samsonidze Georgy
• Craig Nathan
• Johnston Christina

Classifications

• C23C22/50 Primary

  Treatment of iron or alloys based thereon · CPC title

• C23C22/02

  using non-aqueous solutions · CPC title

• C21D6/004 Primary

  containing Cr and Ni · CPC title

• C21D6/005

  containing Mn · CPC title

• C23C8/60

  using solids, e.g. powders, pastes (using liquid suspensions of solids C23C8/40) · CPC title