Claims
- 1. A process for metal finishing comprising contacting the surface of a metallic part or material with a solution which contains 0.1% to 60% by weight of free dithionic acid, wherein said metal finishing improves the mechanical, chemical or aesthetic properties of said metallic part or material.
- 2. The process of claim 1 wherein said solution further comprises at least 100 ppm of sulfuric acid.
- 3. A process for depositing a metal layer on the surface of a solid part or material comprising contacting said solid part or material with an electroplating solution composition comprising 0.1% to 60% by weight free dithionic acid.
- 4. The process of claim 3 wherein said electroplating solution composition further comprises at least 100 ppm of sulfuric acid.
- 5. A process for depositing a metal layer on the surface of a solid part or material comprising contacting said solid part or material with an electroplating solution composition comprising dissolved metal dithionate or ammonium dithionate salts at a concentration of 0.1 molar or greater.
- 6. The process of claim 5 wherein said electroplating solution composition further comprises at least 100 ppm of metal sulfate or ammonium sulfate.
- 7. A process for cleaning or activating the surface of a metallic part or material prior to another treatment process, storage or sale comprising contacting said metallic part or material with a surface cleaning solution composition comprising 0.1% to 60% by weight free dithionic acid.
- 8. The process of claim 7 wherein said surface cleaning solution further comprises at least 100 ppm of sulfuric acid.
- 9. The process of claim 7 wherein said metallic part or material is a ferrous based alloy.
- 10. The process of claim 7 wherein said solution functions primarily as a rust removing agent.
- 11. A process for cleaning or activating the surface of a metallic material, other than copper, comprising contacting said metallic material with a surface cleaning or activating solution composition comprising dissolved metal dithionate or ammonium dithionate salts at concentrations of 0.1 molar or greater.
- 12. The process of claim 11 wherein said surface cleaning solution further comprises at least 100 ppm of metal sulfate or ammonium sulfate.
- 13. The process of claim 11 wherein said metallic part or material is a ferrous based alloy.
- 14. The process of claim 11 wherein said solution functions primarily as a rust removing agent.
- 15. A process for depositing metal on a solid part or material through an electroless or immersion mechanism comprising contacting said solid part or material with a solution comprising 0.1% to 60% by weight free dithionic acid.
- 16. The process of claim 15 wherein said solution further comprises 100 ppm or more of sulfuric acid.
- 17. The process of claim 15 wherein said electroless plating solution is a part of an electroless tin plating system.
- 18. A process for depositing metal on a solid part or material through an electroless or immersion mechanism comprising contacting said solid part or material with a solution comprising dissolved metal dithionate or ammonium dithionate salts at a concentration of 0.2 M or greater.
- 19. The process of claim 18 wherein said solution further comprises at least 100 ppm or more of metal sulfate or ammonium sulfate.
- 20. The process of claim 18 wherein said electroless plating solution is a part of an electroless tin plating system.
- 21. A process for depositing tin on a solid part or material through an electroless plating mechanism comprising contacting said solid part or material with a solution comprising dissolved ammonium dithionate salts at concentrations greater than 0.1M in metal.
- 22. A metallic substrate having at least one surface in contact with an aqueous solution, wherein said substrate is a metallic solid part or material, and said aqueous solution comprises either a) 0.1% to 60% by weight free dithionic acid and 100 ppm or more of sulfuric acid or b) dissolved metal dithionate or ammonium dithionate salts at a concentration of 0.1 or greater and at least 100 ppm of metal sulfate or ammonium sulfate.
REFERENCE TO RELATED APPLICATION
[0001] This application is a divisional of application Ser. No. 09/791,224, filed Feb. 22, 2001, now abandoned, which claims the benefit of U.S. Provisional Application Serial No. 60/186,097, filed Mar. 1, 2000.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60186097 |
Mar 2000 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
09791224 |
Feb 2001 |
US |
Child |
10723921 |
Nov 2003 |
US |