Etching process
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United States of America Patent
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Jan 10, 1995
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app pub date -
Dec 22, 1992
filing date -
May 15, 1991
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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.
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