Chemistry: electrical and wave energy – Processes and products
Patent
1977-01-28
1978-03-21
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
204218, C25D 508, C25D 704
Patent
active
040802680
ABSTRACT:
A method for the high speed chromium plating of piston rings, cylinder liners and the like wherein the cathodic workpiece is rotated at a peripheral speed of 1-4 m/sec. relative to a concentrically disposed anode. The latter may comprise a single spoked member or a plurality of rectangular pieces to thereby create a turbulence in the electrolyte bath. When a cylindrical anode is used, a bladed agitator is secured to the rotating workpiece to generate turbulence. The interelectrode spacing is from 0.1 to 4t cm with a multipolar anode, where t is the thickness of an anode pole. The current density is from 200 - 600 amps/dm.sup.2, and the bath temperature is from 20.degree. - 50.degree. C or from 65.degree. - 80.degree. C, depending on the plating characteristics desired.
REFERENCES:
patent: 644029 (1900-02-01), Cowper-Coles
patent: 680408 (1901-08-01), Cowper-Coles
patent: 895163 (1908-08-01), Cowper-Coles
patent: 1127966 (1915-02-01), Cowper-Coles
Karasawa Hitoshi
Suzuki Hiroshi
Suzuki Shoji
Yaguchi Isao
Yoda Keiichi
Nippon Piston Ring Co. Ltd.
Tufariello T. M.
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