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Acid-Copper Electroplating Module Model 1000 Manual
Electroplating - Panel plating I
- Calculate the total plating time.
An acid copper plating bath based on the PCM+ additive system deposits 0.0011" (1.10 mils, 28 microns, 0.81 oz) of high ductility copper in 1 hour at 20 ASF(Amps per Square Foot). Plating up "one ounce" of copper (i.e. plating 1 oz. of copper onto 1 square foot of board) is equivalent to plating a thickness of 0.0013" (1.3 mils or 34 microns).
Example: If you are starting with "half ounce" copperclad and want to plate up to a finished thickness of "one ounce", you will need to add .65 mils (0.00065"). The total plating time at 20 ASF will be:
[0.65 mils / (1.1 mils/hr.)] x 60 min./hr. = 35.5 minutes = TC
- Calculate the required plating current.
Convert the total area of the substrate being plated into square feet (remember both sides!) and multiply the result by 20. Example: If you are plating a 12" by 9", double-sided board, you will need:
[(12" x 9" x 2 sides)/144] x 20 = 30 Amps = C
- Carefully inspect the substrate for deep scratches and nicks that might impair the quality of the finished circuit.
- Format the drilling stack (assemble with entry foil and backing material) to minimize burr formation during drilling.
- Drill the through-holes and mounting holes, and mill/router any slot or cavity that is to be plated.
- Activate the hole-walls using conductive ink.
- While the ink is curing, take a few minutes to analyze the electrolyte. If you have a hull cell, this is a good time to run a test to insure that the organic components of the bath (which are very difficult to test directly) are in balance and present in the proper concentrations.
- After activation and curing, both sides of the substrate should be thoroughly cleaned to remove any trace of conductive ink from both surfaces. Any ink that is not removed will almost certainly show up in the worst possible place so take your time cleaning the board and make a good job of it!
An abrasive pad (e.g. Scotchbrite® pad) can be used to remove ink that proves to be too stubborn for conventional cleaning, but be careful. You must be certain that you do not break the electrical contact between the conductive ink on the inside of the holes and the copper foil on the surface of the board or the holes in question will not plate properly.
- Rinse the board thoroughly in deionized water before proceeding
- Dip the board into a 10% solution of sulfuric acid (if available) to minimize the introduction of contaminants into the copper plating tank.
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