Electroless nickel plating
Abstract
Abstract THE SUBJECT MATTER OF THIS INVENTION IS AN ELECTROLESS NICKEL PLATING SOLUTION ESPECIALLY FORMULATED FOR NICKEL PLATING ALUMINUM ALLOYS, ALUMINUM IS A DIFFICULT METAL TO PLATE FROM AN ELECTROLESS BATH BECAUSE ALUMINUM IS ACTIVE AND DEPOSITION OVER ALUMINUM TAKES PLACE AT A RAPID RATE. AS A RESULT, THERE IS EXCESSIVE GASSING AT THE ALUMINUM INTERFACE RESULTING IN MIGRATION OF SMUT PARTICLES FROM THE ALUMINUM SURFACES INTO THE PLATING BATH. THESE PARTICLES ACT AS NUCLEI FOR DEPOSITION OF NICKEL RESULTING IN SPONTANEOUS DECOMPOSITION (TRIGGERING) OF THE BATH AND LOSSS THEREOF, AS WELL AS PLATE-OUT ON WALLS OF THE PLATING TANK, RACKS AND THE LIKE. THE INVENTION OVERCOMES THESE DIFFICULTIES BY ADDITION OF AN UNSATURATED CARBOXYLIC ACID TO THE SOLUTION ALONE OR PREFERABLY IN COMBINATION WITH A SECOND STABILIZER. THE ACID ACTS TO SUPPRESS THE RATE OF DEPOSITION OVER ALUMINUM DECREASING GAS EVOLUTION AND MIGRATION OF SMUT INTO THE SOLUTION. AS A RESULT, TRIGGERING OF THE SOLUTION IS RETARDED.
Inventors
- 👤 J Souza
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |