Method for removing red spots on surface of pure gold product

Abstract

The invention provides a method for removing red spots on the surface of a pure gold product. The method especially aims at recovery of the color changing part of the surface of the pure gold craft, mainly removal of red spots. The method comprises the steps that firstly, a washing solution is prepared, then the pure gold product with the color changed is put into the washing solution till the red spots disappear, and then the pure gold product is taken out, washed with deionized water and dried. The method has the advantages that the process is simple, the time for removing the red spots on the surface is short, and the surface of the pure gold product has no physical damage; and medium acid is nitric acid, the pure gold is not damaged, and the washing solution is recyclable and easy to wash away after the red spots are removed.

Description

technical field

[0001] The invention belongs to metal surface treatment, in particular to a method for removing erythema on the surface of pure gold products. Background technique

[0002] The chemical properties of gold are extremely stable, and it does not react with any oxides under non-extreme conditions. However, in recent years, reports of "rusting" on the surface of pure gold products, especially jewelry, are often reported in various media, which is caused by today's gold and silver processing technology itself. In the process of gold and silver processing, due to the high-speed operation of various mechanical processing tools such as lathes, planers, milling, etc., there are tiny particles of gold and silver in the dust on the processing site (not visible to the naked eye), and some enterprises process The gold and silver of the equipment are not separated, which also causes the phenomenon of "gold sticking to silver". As long as silver particles are attached to t...

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