Platinum-containing multilayer anode coating for low pH, high cu

Details Platinum-containing multilayer anode coating for low pH, high cu Platinum-containing multilayer anode coating for low pH, high cu

1988-09-08

1990-04-03

Ryan, Patrick

Stock material or miscellaneous articles

Composite

Of metal

428632, 428670, 148 203, 204290F, B32B 302

Patent

active

049139738

ABSTRACT:
The present invention is directed to a novel anode suitable for producing high purity, pore-free coper foil at high speed and low cost under severe conditions. The anodes of the present invention are capable withstanding high acid concentrations, current densities and temperatures which would rapidly destroy the prior art anodes. This is accomplished by producing the anodes of the present invention by a new and novel process which results in structural superior anodes. The anodes of the present invention are produced by first electrodepositing on a valve metal substrate platinum to a thickness of at least about 150 microinches to about 400 microinches. The next step in the process involves "densification" of the platinum layer by heat treatment so as to close the pores of the platinum layer. This results in a substantially closed pore platinum layer. The final step in the process comprises applying a catalytic oxide outer coating consisting essentially of iridium oxide and rhodium oxide, applied by thermal decomposition at temperatures of no more than 600.degree. C. The resulting electrode is structurally different from the prior art electrodes and superior in operation and use.

REFERENCES:
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patent: 4372824 (1983-02-01), Toda et al.
patent: 4399199 (1983-08-01), McGill et al.
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patent: 4528084 (1985-07-01), Beer et al.
PATENT ABSTRACTS OF JAPAN, C. Field, vol. 4, No. 178, 12/10/80, unexamined applications, THE PATENT OFFICE JAPANESE GOVT, Shin Nippon Seitetsu K.K.
PATENT ABSTRACTS OF JAPAN, C. Field, vol. 5, No. 106, 7/10/81, unexamined applications, THE PATENT OFFICE JAPANESE GOVT, Shin Nippon Seitetsu K.K.
PATENT ABSTRACTS OF JAPAN, E Section, vol. 1, No. 37, 4/18/77, unexamined applications, THE PATENT OFFICE JAPANESE GOVT, Kiyoteru Takayasu.
F. Hine, K. Takayasu, N. Koyanagi, "A Platinized Titanium Anode for Chromium Electroplating", 5/12/85, pp. 346-349.
Tomoyoshi Asaki and Yoichi Kamegaya, Kiyoteru Takayasu, "Field Test of Platinized Titanium Anodes for Hypochlorite Cells", May 6, 1984.

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