Carbosil anodes

• US 4,855,027 A
• Filed: 02/26/1987
• Issued: 08/08/1989
• Est. Priority Date: 01/10/1986
• Status: Expired due to Fees

• Current Assignee: David F. Mccready
• Original Assignee: David F. Mccready
• Inventors: McCready, David F .
• Primary Examiner(s): TUNG, TA HSUNG
• Application Number:
  US07/019,431
• Time in Patent Office: 894 Days
• Field of Search: 204/147, 204/148, 204/196, 204/197, 204/286, 204/297 R, 204/294
• US Class Current: 204/196.38
• CPC Class Codes: C23F 13/02 cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions

Abstract

An anode for cathodic protection having a composition of carbon, silica gel and inert binders. The anode may be mounted on a surface by an adhesive and may be separated from the surface by an insulation layer. A plastic threaded fastener may be used to attach an electrical lead to the anode, and a capsule may be provided to cover the anode.

Claims

1. An anode apparatus for automotive cathodic protection device, comprising:

(a) an insulation layer upon a surface, wherein said layer has about equal parts of polyvinyl acetate-acrylic resin and calcium silicate pigment;

(b) an anode comprising about 90-99% carbon, about 1-9% silica gel, and about 0.1-1% inert binders, mounted on said layer and having a hole extending therethrough receiving a plastic threaded fastener;

(c) an electric lead attached to said anode, wherein said electric lead has a ring connector through which said fastener may be received, whereby said ring may be held fast to a surface of said anode;

(d) the plastic threaded fastener extending through said hole and said ring, a plastic nut receiving said threaded fastener in threaded engagement, and holding the ring on the anode, and wherein said plastic threaded fastener and nut is composed of a polyamide; and

(e) an electrically insulating capsule connected to and covering the anode.

2. The apparatus of claim 1 wherein said anode is composed of sintered material.

3. The apparatus of claim 2 wherein said anode is about 5/16th of an inch thick, and the capsule covers the top and side walls of the anode and is attached to the metal surface by a radially extending flange.

4. Corrosion protection apparatus comprising a sintered anode comprising carbon, silica gel, and binders, electrical lead having an electrical connector, first means for connecting the connector to one side of the anode, second means for connecting a second side of the anode to a surface to be protected, and a capsule covering and electrically insulating the anode.

5. The apparatus of claim 4 wherein the second means comprises an adhesive.

6. The apparatus of claim 5 wherein the adhesive is on both sides of a double sided tape.

7. The apparatus of claim 6 wherein the tape is interposed between the second side of the anode and a flange extending outwardly from a bottom of the capsule on the one side, and paint covering a surface to be protected on the other side.

8. The apparatus of claim 4 wherein the second means is a double sided adhesive tape having one side permanently connected to the second side of the anode and to a flange of the capsule, and having a second side covered by a release coating.

9. An anode apparatus for automotive cathodic protection device, comprising:

a painted metal surface;

an anode comprising about 90-99% carbon, about 1-9% silica gel, and about 0.1≧

1% inert binders, mounted on said surface;

an electric lead attached to said anode, whereby said lead is held fast to said anode; and

adhesive means for holding said anode on said painted metal surface.

10. The apparatus of claim 9 further comprising a non-conducting capsule substantially covering the anode for preventing electric contact.

11. The apparatus of claim 10 wherein the capsule has a outer wall through which a dielectric fastener extends.

12. The apparatus of claim 11 wherein the capsule has a side wall through which a wire of the electric lead extends.

13. The apparatus of claim 10 wherein the capsule is provided with means for communicating moisture in the atmosphere to interact with the anode.

14. The apparatus of claim 13 wherein the communication means comprises a plurality of slots provided in an outer wall of the capsule.

15. The apparatus of claim 13 wherein the communication means comprises a plurality of openings provided in a wall of the capsule.

16. The apparatus of claim 10 wherein the capsule has a first wall covering the anode and side walls extending over the sides of the anode and a flange extending outwardly from the side walls at an end opposite the first wall, and wherein the adhesive means extends between the flange and the surface, wherein the flange supports the capsule on the metal surface, and wherein the electric lead is covered beneath the capsule.

17. The apparatus of claim 16 wherein the capsule is made of polystyrene material.

18. The apparatus of claim 10 wherein the capsule comprises a coating of butylstyrene over an upper portion of the anode.

19. The apparatus of claim 10 wherein the capsule comprises a wall covering the anode and side walls extending over a portion of the anode side walls, wherein the electric lead is connected to the anode within the capsule.

20. The apparatus of claim 9 wherein said anode is composed of sintered material.

21. The apparatus of claim 20 wherein said adhesive means comprises an adhesive coating between the sintered material anode and the painted metal surface.

22. The apparatus of claim 21 wherein said adhesive coating comprises a double sided adhesive tape stuck to the andoe and for sticking to the painted metal surface.

23. The apparatus of claim 22 wherein said tape is about 10 ml. thick.

24. The apparatus of claim 23 wherein said tape is composed of isocyanite material.

25. An anode apparatus for automotive cathodic protection devices, comprising:

(a) an adhesive layer upon a painted metal surface;

(b) an anode comprising about 90-99% carbon, about 1-9% silica gel, and about 0.1-1% inert binders, mounted on said layer;

(c) an electric lead attached to said anode; and

(d) an electrically insulating capsule connected to and covering the anode.

26. The apparatus of claim 25 wherein said anode is composed of sintered material.

27. The apparatus of claim 26 wherein said anode is about 5/16th of an inch thick, and the capsule covers the top and side walls of the anode and is attached to the painted metal surface by a radially extending flange.