Method and apparatus for anodizing objects

• US 6,562,223 B2
• Filed: 04/23/2001
• Issued: 05/13/2003
• Est. Priority Date: 03/23/1998
• Status: Expired due to Term

• Current Assignee: Pioneer Metal Finishing LLC
• Original Assignee: Pioneer Metal Finishing LLC
• Inventors: Rasmussen, Jean
• Primary Examiner(s): Phasge, Arun S.
• Application Number:
  US09/840,353
• Publication Number:
  US 20020008035A1
• Time in Patent Office: 750 Days
• Field of Search: 205/324, 204/225, 204/226, 204/272, 204/275.1
• US Class Current: 205/324
• CPC Class Codes: C25D 11/005 Apparatus specially adapted for electrolytic conversion coating apparatus in general for electrolytic coating C25D17/00
• CPC Class Codes: C25D 11/024 Anodisation under pulsed or modulated current or potential
• CPC Class Codes: C25D 11/026 Anodisation with spark discharge
• CPC Class Codes: C25D 11/04 of aluminium or alloys based thereon
• CPC Class Codes: C25D 17/00 Constructional parts, or assemblies thereof, of cells for electrolytic coating
• CPC Class Codes: C25D 17/02 Tanks; Installations therefor
• CPC Class Codes: C25D 21/18 of electrolytes C25D21/22 takes precedence
• CPC Class Codes: C25D 5/08 Electroplating with moving electrolyte e.g. jet electroplating using locally applied jets of electrolyte C25D5/026
• CPC Class Codes: C25D 5/18 Electroplating using modulated, pulsed or reversing current
• CPC Class Codes: C25D 5/605 Surface topography of the layers, e.g. rough, dendritic or nodular layers

Abstract

A method and apparatus of anodizing a component, preferably aluminum, is disclosed. The component is placed in an electrolyte solution. A number of pulses are applied to the solution and component. Each pulse is formed by a pattern including having three magnitudes. The third magnitude is less, preferably substantially less, than the first and second magnitudes, and all three magnitudes are of the same polarity. The pulse pattern may include alternations between the first and second magnitudes, and following the alternations, the third magnitude. Other patterns may be provided. The solution is in a reaction chamber, along with at least a portion of the component. The fluid enters the reaction chamber from a transport chamber through a plurality of inlets directed toward the component, preferably at an angle of between 60 and 70 degrees. The inlet is preferably the cathode, and the component is the anode, whereby current flows between the cathode and the anode in another embodiment. The inlets are in a side wall such that the fluid enters the reaction chamber substantially horizontally. The reaction chamber has at least one outlet beneath the inlets. The outlet may be in a bottom wall. The fluid follows a return path, such that the fluid returns from the reaction chamber to the transport chamber. The component is held in a mounted position mechanically or pneumatically in various alternatives.

Claims

1. An apparatus for electrolytically treating a component comprising:

a reaction chamber, adapted for placing at least a portion of the component therein, and for holding a reaction fluid;

a transport chamber in fluid communication with the reaction chamber, wherein the fluid enters the reaction chamber from the transport chamber through a plurality of inlets directed toward the component and from a plurality of directions; and

a fluid return path, wherein the fluid returns from the reaction chamber to the transport chamber.

2. The apparatus of claim 1, further including a fluid reservoir, in fluid communication with the transport chamber, wherein the return path includes the fluid reservoir.

3. The apparatus of claim 2, further include a pump disposed between the fluid reservoir and the transport chamber, disposed to pump fluid to the transport chamber, thereby forcing the fluid through the inlets to the component in a plurality of jets directed at the component.

4. The apparatus of claim 1 wherein the reaction chamber has a substantially circular cross section.

5. The apparatus of claim 4 wherein the transport chamber has a substantially circular cross section, and is outside and substantially concentric with the reaction chamber.

6. The apparatus of claim 1, wherein the fluid is directed toward the component at an angle of between 15 and 90 degrees.

7. The apparatus of claim 1, wherein the fluid is directed toward the component at an angle of between 60 and 70 degrees.

8. The apparatus of claim 1, wherein the reaction chamber is disposed substantially vertically and includes at least one side wall and at least one bottom wall, wherein the inlets are disposed in the at least one side wall, such that the fluid enters the reaction chamber substantially horizontally, and wherein the reaction chamber has at least one outlet beneath the inlets.

9. The apparatus of claim 8 wherein the at least one outlet is in the bottom wall.

10. The apparatus of claim 9 wherein at least a portion of the at least one side wall is a common wall with the transport chamber.

11. The apparatus of claim 10 wherein the reaction chamber has a top with at least a removable portion, adapted for mounting the component therein, such that a portion of the component extends into the reaction chamber and at least a portion extends above the reaction chamber.

12. The apparatus of the claim 10 wherein the inlets are at the same height as at least a portion of the component.

13. The apparatus of claim 12 wherein the component is held in a mounted position mechanically.

14. The apparatus of claim 12 wherein the component is held in a mounted position pneumatically.

15. The apparatus of claim 12 wherein at least a portion of the inlet is at least a part of a cathode, and the component is at least a part of the anode, whereby in the anodizing process current flows between the cathode and the anode.

16. An apparatus for electrolytically treating a component comprising:

a reaction chamber, adapted for placing at least a portion of the component therein, and for holding a reaction fluid;

a transport chamber in fluid communication with the reaction chamber, wherein the fluid enters the reaction chamber from the transport chamber through a plurality of inlets directed toward the component at an angle of between 15 and 70 degrees; and

a fluid return path, wherein the fluid returns from the reaction chamber to the transport chamber.

17. The apparatus of claim 16 further including a fluid reservoir, in fluid communication with the transport chamber, wherein the return path includes the fluid reservoir.

18. The apparatus of claim 17 further include a pump disposed between the fluid reservoir and the transport chamber, disposed to pump fluid to the transport chamber, thereby forcing the fluid through the inlets to the component in a plurality of jets directed at the component.

19. The apparatus of claim 16 wherein the reaction chamber has a substantially circular cross section.

20. The apparatus of claim 19 wherein the transport chamber has a substantially circular cross section, and is outside and substantially concentric with the reaction chamber.

21. The apparatus of claim 16 wherein the reaction chamber is disposed substantially vertically and includes at least one side wall and at least one bottom wall, wherein the inlets are disposed in the at least one side wall, such that the fluid enters the reaction chamber substantially horizontally, and wherein the reaction chamber has at least one outlet beneath the inlets.

22. The apparatus of claim 21 wherein the at least ne outlet is in the bottom wall.

23. The apparatus of claim 22 wherein at least a portion of the at least one side wall is a common wall with the transport chamber.

24. The apparatus of claim 23 wherein the reaction chamber has a top with at least a removable portion, adapted for mounting the component therein, such that a portion of the component extends into the reaction chamber and at least a portion extends above the reaction chamber.

25. The apparatus of claim 24 wherein the inlets are at the same height as at least a portion of the component.

26. The apparatus of claim 25 wherein the component is held in a mounted position mechanically.

27. The apparatus of claim 25 wherein the component is held in a mounted position pneumatically.

28. The apparatus of claim 25 wherein at least a portion of the inlet is at least a part of a cathode, and the component is at least a part of the anode, whereby in the anodizing process current flows between the cathode and the anode.

29. An apparatus for electrolytically treating a component comprising:

a reaction chamber, adapted for placing at least a portion of the component therein, and for holding a reaction fluid;

means for directing the reaction fluid into the reaction chamber toward the component and from a plurality of directions, in fluid communication with the reaction chamber; and

a fluid return path, wherein the fluid returns from the reaction chamber to the means for directing.

30. The apparatus of claim 29, further including a fluid reservoir, in fluid communication with the means for directing, wherein the return path includes the fluid reservoir.

31. The apparatus of claim 30 wherein the reaction chamber has a substantially circular cross section.

32. The apparatus of claim 29, further include a pump disposed between the fluid reservoir and the means for directing, disposed to pump fluid to the means for directing.

33. An apparatus for electrolytically treating a component comprising:

a reaction chamber, adapted for placing at least a portion of the component therein, and for holding a reaction fluid;

means for directing the reaction fluid into the reaction chamber toward the component at an angle of between 15 and 70 degrees, in fluid communication with the reaction chamber; and

a fluid return path, wherein the fluid returns from the reaction chamber to the means for directing.

34. A method of electrolytically treating a component comprising:

placing at least a portion of the component in a reaction chamber;

directing a reaction fluid from a transport chamber into the reaction chamber toward the component at an angle of between 15 and 70 degrees, in fluid communication with the reaction chamber; and

circulating the fluid back to the transport chamber.

35. A method of electrolytically treating a component comprising:

placing at least a portion of the component in a reaction chamber;

directing a reaction fluid from a transport chamber into the reaction chamber toward the component from a plurality of directions; and

circulating the fluid back to the transport chamber.