Removable mask for coating a substrate

Patent metadata

Field	Value
Publication number	US-9790598-B2
Application number	US-201313973308-A
Country	US
Kind code	B2
Filing date	Aug 22, 2013
Priority date	Aug 22, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A system and a method for selectively coating a substrate includes a removable mask including a magnetic member having a first surface contour shaped to conform to the outside surface of the substrate and a magnetizable member having a second surface contour shaped to conform to the inside surface of the substrate. The method for coating the substrate includes magnetically coupling a removable mask to at least one surface of the substrate; forming a coating of a coating material on the at least one surface of the substrate with the magnetically coupled removable mask using a bath containing the coating material; and selectively decoupling the removable mask from the at least one coated surface to reveal a portion of the coated surface without the coating.

First claim

What is claimed:

1. A method for selectively coating a substrate, comprising:
magnetically coupling a removable mask to at least one surface of the substrate;
forming a coating of a coating material on the at least one surface of the substrate with the magnetically coupled removable mask using a first bath containing copper plating materials to form a copper plating on the at least one surface of the substrate and a second bath containing conversion treatment coating materials to form a conductive conversion coat on the copper plating; and
selectively decoupling the removable mask from the at least one coated surface to reveal a portion of the surface without the coating.

2. The method of claim 1 , wherein the removable mask and the substrate are magnetically attracted to each other to provide an adhesion force to magnetically couple the at least one surface to the removable mask.

3. The method of claim 2 , wherein the magnetically coupling comprises making the removable mask magnetic by applying an electrical current to the removable mask.

4. The method of claim 1 , wherein the magnetically coupling comprises:
attaching a magnetizable mask to an opposite surface such that the substrate is between the removable and magnetizable masks;
wherein the removable mask is magnetic, and the magnetizable mask is attracted to the removable mask so as to provide an adhesion force to magnetically couple the at least one surface to the removable mask.

5. The method of claim 1 , further comprising subjecting the at least one surface to a pre-treatment process including at least one of a cleaning, a vapor degreasing using trichloroethylene, solvent emulsion cleaning, or immersion in a surfactant.

6. The method of claim 1 , further comprising subjecting the at least one surface to a copper plating to form a copper plated substrate.

7. The method of claim 6 , wherein the copper plating further comprises subjecting the substrate to a cathodic copper plating with the substrate being the cathode.

8. The method of claim 6 , wherein the copper plating further comprises subjecting the substrate to an anodic copper plating with the substrate being the anode.

9. The method of claim 1 , further comprising subjecting the at least one coated surface to a post-treatment process.

10. The method of claim 1 , wherein the forming of the coating further comprises conversion coating the at least one surface of the substrate with a trivalent chromium compound.

11. The method of claim 10 , wherein the conversion coating further comprises immersing the substrate in a conversion treatment bath having dissolved species of a water soluble trivalent chromium compound and a salt of hexafluorozirconic acid.

12. The method of claim 10 , wherein the trivalent chromium compound is trivalent chromium sulfate.

13. The method of claim 10 , wherein the conversion coating further comprises immersing the substrate in the second bath for a predetermined contact time in an ambient temperature environment.

14. A method for selectively coating a surface of a substrate, the method comprising:
forming a removable mask to conform to contours and curvatures of the surface;
magnetically coupling the removable mask to the surface to define masked and exposed portions of the surface;
forming a coating of first and second coating materials on the exposed portion of the surface by:
immersive electroplating of at least the substrate in a first bath in which metallic molecules are suspended, and
immersive treating of the substrate and the removable mask in a second bath of an aqueous salt solution and a trivalent chromate solution; and
with the coating hardened, decoupling the removable mask from the surface.

Assignees

• Sikorsky Aircraft Corp

Inventors

• Guillemette Robert
• Bartalotta John
• Fabian Linda
• Papachristos Gregory C

Classifications

• C23C22/73

  characterised by the process · CPC title

• C25D5/022

  using masking means · CPC title

• C25D5/48

  After-treatment of electroplated surfaces · CPC title

• Y10T428/24917

  including metal layer · CPC title

• C25D5/34

  Pretreatment of metallic surfaces to be electroplated · CPC title