US1783663A - Etching precious metals - Google Patents

Etching precious metals Download PDF

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Publication number
US1783663A
US1783663A US287538A US28753828A US1783663A US 1783663 A US1783663 A US 1783663A US 287538 A US287538 A US 287538A US 28753828 A US28753828 A US 28753828A US 1783663 A US1783663 A US 1783663A
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United States
Prior art keywords
etching
resist
chromium
plating
precious metal
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Expired - Lifetime
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US287538A
Inventor
James C Mcfarland
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WADSWORTH WATCH CASE CO
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WADSWORTH WATCH CASE CO
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Publication date
Application filed by WADSWORTH WATCH CASE CO filed Critical WADSWORTH WATCH CASE CO
Priority to US287538A priority Critical patent/US1783663A/en
Application granted granted Critical
Publication of US1783663A publication Critical patent/US1783663A/en
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Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/02—Local etching
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching

Definitions

  • This invention relates particularly-to a method for etching precious metals; and the ⁇ primary 'object is toprovide a simple and efficacious method for the purpose indicated.
  • chromium platyio 2 ferred method in which chromium plating is applied to the surface;
  • Fig. 2 represents a further step in which a suitableresist design is applied to the chromium plating;
  • Fig. 3 represents a further step in which thechromium plating is removed at the exposed areas;
  • Fig. 4 represents a further step in which the resist is removed;
  • Fig. 5 represents a further step in Which the exposed surfaces of the precious metal are etched While the chromium plating design serves asa resist;
  • Fig. 6 represents the first step in a modified procedure, in which a suitable resist design is applied to the surface of the precious metal;
  • Fi 7 represents a second step in which the chromium plating is applied to the exposed areas of the precious metal;
  • A2 designates the body.
  • D designates a precious metal body
  • E designatesy a suitable resist designapplied thereto
  • F designates a chromium plating design applied to thev exposed areas of theprecious metal surface
  • D designates the etched areas of the precious metal body.
  • the process is applicable to the decoration of the surfaces of various precious metals, such as gold, silver, platinum or their alloys.
  • the ent-ire precious metal surface to be treated is first plated with chromium; a suitable resist design is then applied to ,the chromium plating; the chromium plating is then removed at the exposed areas, as by means of dilute hydrochloric acid, or dilute sulphuric acid; th resist is then removed; and the precious metal surface is then etched by means of a suitable etching agent.
  • a suitable cyanide solu- 1 tion may be used for etching gold.
  • the chromium plating serves as a resist. After the etching operation, the chromium plating may be removed, if desired. 'The etched blank may then be further decorated in any desired manner. If one so desires, the etched gold surface, for example, may be plated with platinum; and
  • the chromium plating design may afterwards be removed.
  • lead may be used, if desired.
  • nitric acid may be employed to remove it after the lead has served as a resist in the etching of the gold surface for example.
  • the chromium plating may be allowed to' remain, if desired.
  • Such a plating'is hard, resistant, will not tarnish, and possesses a color somewhat similar to the color .of aluminum.
  • the resist may be applied to the metal surface in any desired manner.
  • the resist may be applied to the metal surface in any desired manner.
  • the resist may be applied to the metal surface in any desired manner.
  • etched areas of the precious metal t metal surface is coated with a light-sensitive varnish; the film is then acted upon b light transmitted through a transparency aving thereon a picture, design, or character; and the unreacted portions of the varnish are then removed by a suitable developing operation.
  • Chromium p lating is hard, resistant, and free from tarnishing.
  • chromium' plating rather than lead plating, or some other metal platin as a resist in etching precious metal suraces. It may be added that chromium plating is much superior to ordinary resists for use in etching precious metal surfaces.
  • chromium plating which comprises: applying to the surface ofthe metal a chromium plating adapted to serve as a resist to the etching fluid for the precious metal; etching the exposed surface of the precious metal while said plating design serves as a resist; and removing the chromium plating.
  • the method of etching precious metals which comprises: applying to the surface of the metal a'chromium plating adapted to serve as a resist to an etching fluid for the Y precious metal; and etching the exposedl surface of the precious metal while said plating design serves as a resist.
  • the method of etching precious metals* which comprises: applying a suitable resist to the precious metal, plating the exposed surface of the precious metal with chromium, Y

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • ing And Chemical Polishing (AREA)

Description

vretenait Dec. z, i930 UNITED l STA-TES. PATENT OFFICE JAMES C. MCFABLAND, OF FORT THOMAS, KIENTUCKY, ASSIGNO TO THE WADBWOBTH WATCH CASE CO., OIE' DAYTON, `KENTUCKY, CORPORATION OF KENTUCKY ETCHING PRECIOUS METALS Application med June 22, 1928. Serial VIlo. 87,55`i8.
This invention relates particularly-to a method for etching precious metals; and the `primary 'object is toprovide a simple and efficacious method for the purpose indicated.
In the improved method, chromium platyio 2 ferred method in which chromium plating is applied to the surface; Fig. 2 represents a further step in which a suitableresist design is applied to the chromium plating; Fig. 3 represents a further step in which thechromium plating is removed at the exposed areas; Fig. 4 represents a further step in which the resist is removed; Fig. 5 represents a further step in Which the exposed surfaces of the precious metal are etched While the chromium plating design serves asa resist; Fig. 6 represents the first step in a modified procedure, in which a suitable resist design is applied to the surface of the precious metal; Fi 7 represents a second step in which the chromium plating is applied to the exposed areas of the precious metal;
after removal of the chromium plate throughout the exposed areas thereof; and A2 designates the body.
Referring to Figs. 6-10, D designates a precious metal body; E designatesy a suitable resist designapplied thereto; F designates a chromium plating design applied to thev exposed areas of theprecious metal surface; and D designates the etched areas of the precious metal body.
The process is applicable to the decoration of the surfaces of various precious metals, such as gold, silver, platinum or their alloys. In the preferred procedure illustrated in Figs. 1-5,'the ent-ire precious metal surface to be treated is first plated with chromium; a suitable resist design is then applied to ,the chromium plating; the chromium plating is then removed at the exposed areas, as by means of dilute hydrochloric acid, or dilute sulphuric acid; th resist is then removed; and the precious metal surface is then etched by means of a suitable etching agent. For example, a suitable cyanide solu- 1 tion may be used for etching gold. During t-he etching operation, the chromium plating serves as a resist. After the etching operation, the chromium plating may be removed, if desired. 'The etched blank may then be further decorated in any desired manner. If one so desires, the etched gold surface, for example, may be plated with platinum; and
the chromium plating design may afterwards be removed.
The modified method illustrated in Figs. 6-10 will be understood without further description.
In lieu of chromium plating, lead may be used, if desired. Where-lead is so used, nitric acid may be employed to remove it after the lead has served as a resist in the etching of the gold surface for example.
Where a chrqfnium plating design'is used as a resist in the etching operation, the chromium plating may be allowed to' remain, if desired. Such a plating'is hard, resistant, will not tarnish, and possesses a color somewhat similar to the color .of aluminum.
The resist may be applied to the metal surface in any desired manner. Preferably, the
etched areas of the precious metal t metal surface is coated with a light-sensitive varnish; the film is then acted upon b light transmitted through a transparency aving thereon a picture, design, or character; and the unreacted portions of the varnish are then removed by a suitable developing operation.
Chromium p lating is hard, resistant, and free from tarnishing.
It has been demonstl-ated that it will serve effectively as a resist against those agents which can be used in etching gold and other precious metals and alloys. It is preferred to use chromium' plating rather than lead plating, or some other metal platin as a resist in etching precious metal suraces. It may be added that chromium plating is much superior to ordinary resists for use in etching precious metal surfaces.
The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, but the appended claims should be construed as broadly as permissible, in view of the prior art.
What I regard as new, and desire to secure by Letters Patent, is: v
1. The method of etching precious metals,
which comprises: applying to the surface ofthe metal a chromium plating adapted to serve as a resist to the etching fluid for the precious metal; etching the exposed surface of the precious metal while said plating design serves as a resist; and removing the chromium plating.
2. The method of etching precious metals :which comprises: applying to the surface of the metal a'chromium plating adapted to serve as a resist to an etching fluid for the Y precious metal; and etching the exposedl surface of the precious metal while said plating design serves as a resist.
3. The method of etching precious metals* which comprises: applying a suitable resist to the precious metal, plating the exposed surface of the precious metal with chromium, Y
removing the resist, etching the exposed surface of the precious metal While the chromium serves as a resist, and removing the chromium.
JAMES C. MCFRLAND.
US287538A 1928-06-22 1928-06-22 Etching precious metals Expired - Lifetime US1783663A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035990A (en) * 1958-11-05 1962-05-22 Collins Radio Co Chemical blanking of aluminum sheet metal
US5006207A (en) * 1989-07-27 1991-04-09 Gerber Plumbing Fixtures Corp. Method of decorating an expansive surface of a metallic faucet spout or other plumbing fixture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3035990A (en) * 1958-11-05 1962-05-22 Collins Radio Co Chemical blanking of aluminum sheet metal
US5006207A (en) * 1989-07-27 1991-04-09 Gerber Plumbing Fixtures Corp. Method of decorating an expansive surface of a metallic faucet spout or other plumbing fixture

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