Electrolytic etching of metals to reveal internal quality

Details Electrolytic etching of metals to reveal internal quality Electrolytic etching of metals to reveal internal quality

1990-05-04

1991-10-29

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412935, 20412975, 2041415, C25F 306, C25F 316

Patent

active

050613529

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.

REFERENCES:
patent: 2745805 (1956-05-01), Jones, Jr.
patent: 4533642 (1985-08-01), Kelly
patent: 4718992 (1988-01-01), Funahashi et al.

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