Method and apparatus for electrolytic etching of metals
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United States of America Patent
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Feb 16, 1993
Issued Date -
N/A
app pub date -
Aug 14, 1991
filing date -
Jun 5, 1989
priority date (Note) -
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Abstract
The internal quality of continuously cast and other steel samples in the form of ingots, billets, blooms, slabs and bars is determined in rapid manner to enable potentially problem-causing casting conditions to be identified and corrected in timely manner. A steel sample from the casting, after grinding to remove any heat-affected zone and to provide a desired degree of surface roughness, is anodically etched using dilute hydrochloric acid at ambient temperature to etch away metal from the surface to reveal the internal quality. After removal of the sample from the etching apparatus, the sample is washed, dried, and visually examined to determine the internal quality.
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