Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1992-12-22
1995-01-10
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041298, 20412995, 20412935, 20412946, 156656, C25F 308, C23F 100
Patent
active
053804082
ABSTRACT:
The present invention relates to an etching process for the purpose of removing binder phase from the surface of a hard metal consisting of hard material in a binder phase based on cobalt and/or nickel. By carrying out the etching process electrolytically in a mixture containing concentrated sulfuric acid and concentrated phosphoric acid at a volume ratio of 0.5-2 with a water content of <50% at a temperature of 25.degree.-60.degree. C. an even binder phase removal without deep penetration is achieved.
REFERENCES:
patent: 2334698 (1943-11-01), Faust
patent: 2334699 (1943-11-01), Faust
patent: 2338321 (1944-01-01), Faust
patent: 2429676 (1947-10-01), Faust
patent: 2440715 (1948-05-01), Faust
patent: 2493579 (1950-01-01), Hammond et al.
patent: 2550544 (1951-04-01), Faust
patent: 2594124 (1952-04-01), Charlesworth
patent: 2820750 (1958-01-01), Charlesworth
patent: 4140597 (1979-02-01), Kobayakawa
patent: 4169026 (1979-09-01), Kikuchi et al.
patent: 4282289 (1981-08-01), Kullander et al.
patent: 4610931 (1986-09-01), Nemeth et al.
patent: 4710279 (1987-12-01), Hozer
patent: 4740280 (1988-04-01), Ruhstorfer
patent: 4911989 (1990-03-01), Minoru et al.
patent: 5135801 (1992-08-01), Nystrom et al.
Electropolishing, G. R. Schaer, Columbus, Ohio.
Electroplating Engineering Handbook, Graham, 1962.
Metal Finishing, Electropolishing, The Practical Side-II, Charles L. Faust, Columbus, Ohio, Aug. 1982.
Metal Finishing, Electropolishing, Stainless Steel, Charles L. Faust, Columbus, Ohio, Sep. 1982.
Metal Finishing, Columbus, Ohio, Nov. 1982, p. 67.
Metal Finishing, Electropolishing, Stainless Steel-Electropolishing Large Vessels and Tubes-Part I, Charles L. Faust, Columbus, Ohio, Feb. 1983.
The Monthly Review, Electrolytic Polishing, Joseph Mazia, Aug. 1947, p. 942.
Sandvik AB
Valentine Donald R.
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