A process for partial coloring of sterling silver commemorative coins/chaps

A commemorative coin, silver coin technology, applied in the direction of metal material coating process, etc., can solve the problems of corrosion and discoloration, affecting the appearance of silver coins, etc., to achieve the effect of increasing corrosion resistance, reducing equipment dependence, and simple process steps

Active Publication Date: 2021-07-09
SHANGHAI MINT
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] In addition, precious metal silver coins are commonly used as commemorative coin materials. Due to the influence of production process, storage environment and use status, etc., there are always corrosion and discoloration phenomena, such as silver vulcanization and blackening to black spots, chlorination to white spots, etc.
This localized, occasional corrosion and discoloration seriously affects the appearance of silver coins

Method used

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  • A process for partial coloring of sterling silver commemorative coins/chaps
  • A process for partial coloring of sterling silver commemorative coins/chaps
  • A process for partial coloring of sterling silver commemorative coins/chaps

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Embodiment Construction

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two elements. Those of ordinary skill in the art can understand the specifi...

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Abstract

The invention describes a process for local coloring treatment of sterling silver commemorative coins / chapters, using sandblasting technology to sandblast the surface of silver coins, using Al 2 o 3 or Cr 2 o 3 Sand; immerse the silver coins after sandblasting in the prepared solution for overall vulcanization treatment; desulfurize the silver coins after the overall vulcanization treatment; perform partial vulcanization treatment on the designated area of ​​the silver coin; perform post-processing on the partially vulcanized silver coins , making the vulcanized part appear colored. The local vulcanization treatment of the technical solution of the present invention makes the surface of the silver coin partially colored, and the partially colored silver coin will not change in color during daily use and for a long time. Through the process of the present invention, the commemorative coin The surface has increased anti-corrosion and anti-discoloration capabilities, ensuring that the appearance of commemorative coins will not be affected by external factors; reducing the traditional complex process, greatly reducing the dependence on equipment, and greatly reducing the harm to the environment.

Description

technical field [0001] The invention relates to the technical field of precious metal colored commemorative coins, in particular to a process for partial coloring of sterling silver commemorative coins / chapters, specifically a commemorative coin coloring process for performing vulcanization treatment on the partial surface. Background technique [0002] At present, the relatively mature and popular color commemorative coin production technologies at home and abroad include color printing, ultraviolet color spraying, and mosaic technology. Compared with natural color coins, colored commemorative coins have richer and more direct artistic expression effects, so they have won unanimous praise from coin collectors and lovers. However, the environmental hazards brought about by the relatively complex process flow, equipment and process itself have been unavoidable. Therefore, it is necessary to apply some special and more environmentally friendly techniques to obtain colorful co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/78C23C22/73C23C22/68C23C22/84
Inventor 谢欣锐刘耀光马军
Owner SHANGHAI MINT
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