Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating moving substrate
Patent
1993-03-29
1995-02-21
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating moving substrate
205148, 205303, C25D 520
Patent
active
053912900
ABSTRACT:
A method for continuously tin-electroplating a metal strip, which comprises the steps of: causing a DC electric current to flow between a metal strip and an anode arranged adjacent to the metal strip while passing the metal strip at a travelling speed of at least 1 m/minute through an acidic tin-electroplating solution containing tin ions and an organic acid within a range of from 4.8 to 98 g/l as converted into sulfuric acid, to form a tin-electroplating layer on at least one surface of the metal strip; and applying an ultrasonic vibration, emitted from at least one ultrasonic vibrator and having an intensity within a range of from 0.01 to 1,000 W/100 cm.sup.2 and a frequency within a range of from 25 to 55 kHz, to the acidic tin-electroplating solution between the metal strip and the anode, thereby removing a diffusion layer of tin ions existing in the acidic tin-electroplating solution adjacent to the surface of the metal strip.
REFERENCES:
patent: 5174887 (1992-12-01), Federman et al.
W. D. Mogerman, Ultrasonics in the Plating Industry, Plating, Aug. 1967, pp. 941-947.
A. Roll, The Influence of Sound and Ultrasound on Electro-Chemical Processes, The Engineers' Digest, Aug. 1952, vol. 13 No. 8 pp. 257-259; Sep. 1952, vol. 13 No. 8, pp. 314-316; Oct. 1952, vol. 13, No. 10, pp. 357-360.
H. E. Ricks, Ultrasonics improves, shortens and simplifies plating operations, MPJM, Mar. 1962, pp. 17-19.
Chemical Abtracts, vol. 103, No. 18, Nov. 1985, Columbus, Ohio, US; Abstract No. 149619m, Ratajewics "Electroplating With Tin Alloys", p. 518; of PL-A-127 385, Feb. 28, 1985.
Chemical Abstracts, vol. 105, No. 10, Sep. 1986, Columbus, Ohio, US; Abstract No. 87475s, Samel "Electrodeposition of Tin From Sulfamate Solution", p. 572; of Trans. Inst. Met. Finish., vol. 64, No. 3, 1986, (Eng)., pp. 119-123.
C. T. Walker et al, "Effets de l'agitation ultrasonique sur certaines proprietes des depots galvaniques", Nov. 1974, Galvano-Organo, No. 449, pp. 1009-1014.
Ichiba Mikiyuki
Iwasa Hiroki
Kojima Katsumi
Watanabe Toyofumi
Yamashita Masaaki
Leader William T.
Niebling John
NKK Corporation
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