High-anti-recovery silver alloy for jewelry and preparation method of high-anti-recovery silver alloy

Abstract

The invention provides a high-anti-recovery silver alloy for jewelry. The high-anti-recovery silver alloy comprises the following elements, by weight percentage, 1-8% of copper, 0-6% zinc and 0.1-1.5%of nickel and the balance silver, a part of nickel combines with copper and / or zinc to form a metal compound, the metal compound wraps another part of nickel to form a quincunx product to be dispersed in a matrix with silver as the main body; and a part of nickel and copper and / or zinc form copper nickel, zinc nickel, zinc copper, copper zinc nickel and other metal compounds and then wrap another part of nickel to form quincunx products to be dispersed in a silver matrix system, and the metal compounds improve the anti-recovery performance of the silver alloy by changing the electrochemical properties of the silver alloy. According to the high-anti-recovery silver alloy for jewelry, the jewelry made of the silver alloy has high anti-recovery performance, and the anti-recovery performance cannot decrease along with scraping of the jewelry.

Description

technical field [0001] The invention relates to the technical field of silver jewelry, in particular to a high-sulfide-resistant silver alloy for jewelry and a preparation method thereof. Background technique [0002] The use of silver in the jewelry industry is relatively large. In the liquid or atmosphere containing sulfur ions, whether it is 100% pure silver or 925 silver and other silver products, it is easy to react with sulfur-containing compounds and change color. Take Na 2 S as an example, Ag directly interacts with O in solution 2 and Na 2 When exposed to S at the same time, corrosion and discoloration will soon occur. The longer the exposure time in the air, the more serious the discoloration will be. The order of color change is: silvery white→yellow→brown→blue→black. At the same time, silver and its alloys have an effect on H 2 S gas has a strong affinity, when H 2 S concentration exceeding 0.3μg / m 3 When it is very easy to react, black Ag is formed on the...

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Problems solved by technology

Surface treatment adopts electroplating method or chemical passivation method to cover single-layer, multi-layer or electroplating plus chemical passivation composite film on the surface of silver alloy. The coating composition is generally Ni, Ti and other metals or Rh, Pt, Pd and other precious metals. The thickness is 10-50μm. Using this method, the surface can maintain a bright color, and the underlying silver alloy will not be in contact with various substances in the atmosphere or solution, which can effectively improve the anti-sulfurization performance of the silver alloy. However, due to the surface The film produced by the treatment is thin, and the jewelry is easy to be bumped and worn during the wearing process, causing the film to be damaged or peeled off, and the exposed silver alloy part will still undergo vulcanization reaction, resulting in discoloration of the silver alloy. Obviously, this method is not the best solution to the discoloration of the silver alloy. method

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