Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1984-10-24
1985-03-26
Tufariello, Thomas
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
20412965, C25F 316
Patent
active
045071845
ABSTRACT:
The invention provides a means for solving the difficult problem of the deposition of stain in the recesses to cause loss of beautiful appearance on the matted surface of an article for personal ornament made of titanium, zirconium or an alloy thereof formed by honing or barrel finishing. The method comprises the steps of (a) forming a first matted surface with microscopically fine protrusions and recesses on the article by honing or barrel finishing, (b) forming a hardened layer on the matted surface by nitriding, carbonizing, boriding or oxidizing, (c) partially removing the hardened layer covering the protrusions on the matted surface by a first electrolytic or chemical polishing, (d) forming a second matted surface on the article by honing or barrel finishing, and (e) partially removing the surface layer at the protrusions by a second electrolytic or chemical polishing to smoothen the surface leaving a sandy appearance.
REFERENCES:
patent: 3347760 (1967-10-01), McKelvie
patent: 3386901 (1968-06-01), Young
patent: 4437956 (1984-03-01), Coates
Irie Kenji
Kushida Hachiro
Murata Toshio
Citizen Watch Co. Ltd.
Tufariello Thomas
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