Process for producing brown covering layers on copper
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United States of America Patent
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Feb 1, 1994
Grant Date -
N/A
app pub date -
Oct 28, 1991
filing date -
Oct 27, 1990
priority date (Note) -
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Abstract
A method for producing a uniform and adherent brown covering layer (brown patina) on surfaces of semifinished products made of copper, particularly on rolled tapes or sheets used in building construction. The surface of the copper semifinished product is first roughened by means of a mechanical treatment. The copper semifinished product is then heat treated at a temperature lying within the temperature range of 150.degree. to 650.degree. C. for the duration of 0.1 to 30 minutes. The copper semifinished product can be advantageously subjected to a chemical postoxidation treatment immediately following the heat treatment.
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