Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating substrate prior to coating
Patent
1995-11-21
1997-08-26
Valentine, Donald R.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating substrate prior to coating
205658, 205682, 205683, 205263, 205265, 427328, C25D 534, B05D 300
Patent
active
056607083
ABSTRACT:
It is an object of this invention to provide a process for manufacturing a lead frame by polishing a blank for a lead frame electrolytically and plating the electrolytically polished surface of the blank with a metal, which process enables the electrolytic polishing of the blank to be continued for a long time by employing a contactless electrolytic polishing apparatus, and can form an electrolytically polished surface which is sufficiently smooth to allow it to be plated with a very good metal coating.
The contactless electrolytic polishing apparatus is employed for applying a direct current with ripples having a frequency of 40 to 120 Hz alternately to the anode and cathode in an electrolytic polishing tank filled with an electrolytic polishing solution, so that the time for which the blank positioned between both electrodes functions as the anode may be at least 3.3 times longer than that for which it functions as the cathode, and the blank is, then, plated with a metal by employing a customary method.
REFERENCES:
patent: 2582020 (1952-01-01), Emery
patent: 3630864 (1971-12-01), Nakamura et al.
patent: 4125444 (1978-11-01), Inoue
patent: 4545875 (1985-10-01), Riley
patent: 4548683 (1985-10-01), Huang et al.
patent: 5242556 (1993-09-01), Masuzawa
Kakimoto Mitsuyuki
Kobayashi Satoshi
Ogawa Shigeki
Sasaki Kiyotaka
Tani Miyuki
Sumitomo Metal Mining Company Limited
Valentine Donald R.
LandOfFree
Process for manufacturing a lead frame does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for manufacturing a lead frame, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for manufacturing a lead frame will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1985523