Method for preparing composite film on surface of precious metal, composite film and precious metal

Abstract

The invention particularly relates to a method for preparing a composite film on the surface of precious metal, the composite film and the precious metal, and belongs to the field of atomic layer deposition. Depositing a second precursor on the surface of the first deposition film to obtain a second deposition film; wherein the first precursor comprises an oxygen-containing precursor and an aluminum-containing precursor, and the second precursor comprises an oxygen-containing precursor and a titanium-containing precursor. The first precursor is firstly deposited on the substrate to obtain the first deposition film, the surface of the first deposition film is compact and can be well attached to the surface of precious metal, then the second precursor is deposited on the surface of the first deposition film to obtain the second deposition film, and the second deposition film is more stable in property and not prone to being oxidized or dissolved. The first deposition film enhances the adhesive force and compactness of the composite film, and the second deposition film enhances the chemical stability and physical stability of the composite film, so that the composite film has good precious metal corrosion resistance and scratch resistance.

Description

technical field [0001] The present application relates to the field of atomic layer deposition, and in particular, to a method for preparing a composite film on the surface of a precious metal, the composite film and the precious metal. Background technique [0002] Precious metals are expensive, most have beautiful colors, and many are used to make jewelry and souvenirs. Most of them are relatively stable in chemical properties and generally do not react chemically with other external substances. However, in the production process, other metal impurities will inevitably be mixed. [0003] If the precious metal contains aluminum, the aluminum on the surface will dissolve due to perspiration, resulting in discoloration. If the precious metal contains silver element, it reacts with gas molecules in the air and changes color to form black silver sulfide. If the precious metal contains mercury, a white gold-mercury compound may be produced. The above-mentioned metal impuriti...

AI Technical Summary

Problems solved by technology

[0004] The application provides a method for preparing a composite film on the surface of a precious metal, a composite film and a precious metal, so as to solve the technical problem that the anti-corrosion performance of the precious metal surface film layer in the prior art is not strong

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