Method for treating a metal product
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United States of America Patent
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May 21, 2002
Grant Date -
N/A
app pub date -
Jul 20, 2000
filing date -
Feb 2, 1998
priority date (Note) -
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Abstract
Method of electrolytically continuously treating a material of stainless steel at a current density of 0.1-3 A/cm.sup.2, wherein the material is passed through one or more electrolytic cells arranged in series. The cells contain an electrolyte selected from sulphuric acid, a salt thereof, phosphoric acid and nitric acid, and the material is passed through the electrolyte between electrodes arranged in series under the influence of a direct current with alternating polarity. The electrodes are arranged alternately anodic and cathodic and every electrode on one side of said material is matched by an electrode of the same polarity on an opposite side of the material, whereby an oxide surface layer with a thickness of at least 1 micrometer is removed from the material to produce a surface conditioning effect.
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