Application of insulating coating

• US 8,507,042 B2
• Filed: 01/23/2012
• Issued: 08/13/2013
• Est. Priority Date: 06/15/2007
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Purdy, Aaron T., Ward, Theresa N., Clements, J. Sidney, Anderson, Michael G., Bennett, Julie K., Pate, Kevin D.
• Primary Examiner(s): Empie, Nathan
• Assistant Examiner(s): ZHAO, XIAO SI
• Application Number:
  US13/355,887
• Publication Number:
  US 20120119022A1
• Time in Patent Office: 568 Days
• Field of Search: 427/256, 427/261, 427/265, 427/286, 427/287, 244/119, 244/120, 244/121, 244/123.1, 244/134.D, 361/117
• US Class Current: 427/287
• CPC Class Codes: B05D 2202/25 based on Al
• CPC Class Codes: B05D 5/00 Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• CPC Class Codes: B05D 5/12 to obtain a coating with specific electrical properties
• CPC Class Codes: B05D 7/02 to macromolecular substances, e.g. rubber treatment or coating of shaped articles made of macromolecular substances C08J7/00
• CPC Class Codes: B05D 7/14 to metal, e.g. car bodies involving a chemical reaction between the metal and the coating C23
• CPC Class Codes: B64D 37/32 Safety measures not otherwise provided for, e.g. preventing explosive conditions extinguishing or preventing fires in aircraft A62C
• CPC Class Codes: B64D 45/02 Lightning protectors; Static dischargers in general H01T

Abstract

Systems and methods for discontinuously applying an insulating primer to a carbon fiber reinforced plastic (CFRP) component are disclosed. In one embodiment, a method for mitigating electrical surface discharges from a CFRP component includes first applying an insulating primer to a metallic component. Next, an insulating primer is applied discontinuously to the CFRP component adjacent the metallic component. The discontinuous application of the insulating primer forms a primed portions and unprimed portions. The unprimed portions are configured to enable electrostatic dissipation.

Claims

1. A method to mitigate electrical surface discharges, comprising:

applying a first insulating primer to a metallic component;

providing one or more electrostatically dissipative features to a carbon fiber reinforced plastic (CFRP) component adjacent the metallic component; and

applying a second insulating primer discontinuously to the CFRP component to form at least one primed portion and at least one unprimed portion, the at least one primed portion being disposed adjacent the electrostatically dissipative features,

wherein the insulating primer comprises a corrosion resistant finish to at least prevent galvanic corrosion of the metallic component; and

wherein applying a second insulating primer discontinuously includes forming the at least one primed portion so that it extends at least approximately 1.75 inches from the metallic component.

2. The method of claim 1, wherein applying a second insulating primer discontinuously includes forming the at least one primed portion so that it extends no more than approximately 2.25 inches from the electrostatically dissipative feature.

3. The method of claim 1, wherein applying a second insulating primer discontinuously includes forming the a plurality of primed portion and at least one unprimed portion such that each primed portion is separate from an adjacent primed portion by at least 0.25 inches of some unprimed portion.

4. The method of claim 1, wherein applying a second insulating primer to a metallic component includes applying an insulating primer to an aluminum component.

5. The method of claim 1, wherein providing one or more electrostatically dissipative feature includes one of a primer coated metallic component, a k-code fastener, an uncoated fastener, and an unprimed portion of a CFRP component having a minimum cross section of 0.25 inches.

6. The method of claim 1, wherein applying a second insulating primer discontinuously includes forming the at least one primed portion so that it extends at least approximately 1.0 inches from the metallic component and no more than approximately 2.25 inches from the electrostatically dissipative feature.

7. A method to define a discontinuous application of an insulating primer to a carbon fiber reinforced plastic (CFRP) component which is to be secured adjacent a metallic component, comprising:

defining a first primer portion that extends at least a minimum length from the adjacent metallic component;

defining at least a second primer portion on the CFRP component, wherein the first primer portion and the second primer portion are separated by a first unprimed portion;

designating a boundary for the second primer portion at the end of the CFRP component in response to a determination that the second primer portion extends beyond an end of the CFRP component;

designating a boundary for the first unprimed portion between the first primer portion and the second primer portion in response to a determination that the unprimed portion extends between the first primer portion and the second primer portion, wherein the first primer portion and the second primer portion are positioned at least 1.75 inches from the metallic component.

8. The method of claim 7, wherein applying a second insulating primer discontinuously comprises placing a masking material on portions of the carbon fiber reinforced plastic (CFRP) component to define the first unprimed portion.

9. The method of claim 7, wherein the first unprimed portion has a width that measures between 0.105 inches and 0.145 inches.

10. The method of claim 7, wherein the boundary for the second primer portion includes an edge of the CFRP component.

11. The method of claim 7, further comprising:

terminating at least one of the first primer portion or the second primer portion in response to a determination that the first primer portion intersects the second primer portion.

12. A method to define a discontinuous application of an insulating primer that includes dissipative features to a carbon fiber reinforced plastic (CFRP) component which is to be secured adjacent at least two metallic components, comprising:

determining a shortest distance between a plurality of metallic components;

reducing a minimum length of an unprimed surface portion when the shortest distanced between a plurality of components results in a unacceptable overlap between adjacent sections of insulating primer layers;

defining a first primer portion proximate a first metallic component, wherein the first primer portion extends between 1.75 inches and 2.25 inches from an edge of the first metallic component;

defining a boundary for the first primer portion to provide at least one dissipative feature on the CFRP component.

13. The method of claim 12, further comprising applying a second insulating primer layer discontinuously to the CFRP component.

14. The method of claim 13, wherein applying a second insulating primer layer discontinuously to the CFRP component comprises:

determining whether a second insulating primer portion extends beyond a maximum distance from a dissipative component; and

reducing the maximum distance when the second insulating primer portion extends beyond a maximum distance from a dissipative component.

15. The method of claim 13, wherein applying a second insulating primer layer discontinuously to a surface of a carbon fiber reinforced plastic (CFRP) component comprises:

determining whether a second insulating primer portion extends beyond an edge of the carbon fiber reinforced plastic (CFRP) component; and

reducing a length of the second insulating primer when second insulating primer portion extends beyond an edge of the carbon fiber reinforced plastic (CFRP) component.