Noble-metal protection film and method for forming noble-metal protection film

A precious metal, protective film technology, applied in metal material coating process, device for coating liquid on the surface, liquid chemical plating, etc. Ease of rationalization of production facilities, easy expansion of production scale or effect of expansion

Inactive Publication Date: 2013-12-04
JEWELRY MIURA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the polysilazane solution starts to react with water vapor in the air at the moment it is applied to the metal surface, and it is difficult to form a uniform thinner coating film.

Method used

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  • Noble-metal protection film and method for forming noble-metal protection film
  • Noble-metal protection film and method for forming noble-metal protection film
  • Noble-metal protection film and method for forming noble-metal protection film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0078] By placing the test pieces A to C in Table 1 in a glove box replaced with dry argon, and immersing them in the liquid glass film-forming composition prepared with the composition of the coating liquid 1 in Table 2, Thus, the glass film-forming composition was coated on the surfaces of the test pieces A to C. Then, in the glove box, using tools such as writing brushes, the film thickness of the liquid coating film was adjusted so that there was no unevenness in the liquid coating film formed on the respective surfaces of the test pieces A to C. to become even.

[0079] Then, the test pieces A to C were taken out from the glove box, and the test pieces A to C were fired at 450° C. under atmospheric pressure for one hour using an electric furnace, and then cooled to obtain Example 1. Precious metal protective films (1)-1 and (1)-3 and reference example (1)-2. In addition, the immersion of the test pieces A to C in the coating liquid 1 was carried out in a state in which ...

Embodiment 2）

[0083] The noble metal protective films (2)-1, (2)-2 and ( 2)-3. About these protective films, Martens hardness (HM) and Vickers hardness (HV) were measured on the same conditions as Example 1. The results are shown in Table 4.

[0084] [Table 4]

[0085]

Embodiment 3）

[0087] The precious metal protective film (3)-1 of Example 3 was obtained under the same conditions as in Example 1, except that the coating solution 2 in Table 2 was used as the composition for forming a glass film, and the number of times of coating was two. , (3)-2 and (3)-3. About these protective films, Martens hardness (HM) and Vickers hardness (HV) were measured on the same conditions as Example 1. The results are shown in Table 5.

[0088] [table 5]

[0089]

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Abstract

The purpose of the present invention is to easily form, on the surface of a noble-metal base, a protection film which is a strong and dense protection film having excellent adhesion to the noble-metal base and having such a degree of durability that the protected noble metal can be frequently worn in the daily life without necessitating any special care to the handling and which has excellent corrosion resistance and retains these effects over a long period. The noble-metal protection film according to the invention is a silica glass film having a thickness of 0.2-1.0 [mu]m formed by applying, to the surface of a noble-metal base, a composition for glass coating formation that contains a polysilazane as a main component and holding the noble-metal base to which the composition for glass coating formation has been applied, at a temperature lower than the melting point of the noble-metal base in an atmosphere where water vapor is present.

Description

technical field [0001] The present invention relates to a method for protecting the surface state of precious metals that are prone to discoloration, such as silver alloys, gold, and "Purple Gold" mainly composed of aluminum (hereinafter referred to as "Au-Al alloys"). The film, more specifically, relates to the formation of a silica glass film excellent in protective properties against the surface state of the noble metal, and a method for forming the silica glass film. Background technique [0002] At present, most of the precious metal alloys used as decorations are in gold or silver colors. In addition, Au-Al alloys are used to form bright alloys that especially exhibit purple. In fact, the decorative value of the purple-tinged alloy is so high that it is expected that it will be used not only as a base metal for jewelry, but also as an ornament itself. [0003] Therefore, the use of the purple-colored alloy, the so-called purple gold, to manufacture various decorative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12
CPCC23D5/02C23C18/1241C23C18/122B05D1/18B05D3/0218C23C18/1212Y10T428/265
Inventor 三浦利典
Owner JEWELRY MIURA
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