Anti-discoloring protective agent for silver plating and preparation method as well as application method thereof

Abstract

The invention discloses an anti-discoloring protective agent for silver plating and a preparation method as well as application method thereof. The anti-discoloring protective agent for silver plating comprises the following components in parts by weight: 5-20 parts of film forming matter, 1-5 parts of auxiliary film forming matter, 3-12 parts of organic inhibitor and 55-90 parts of dispersing agent. The preparation method of the anti-discoloring protective agent comprises the following steps of: putting the film forming matter, the auxiliary film forming matter and the organic inhibitor intothe dispersing agent, stirring for fully dissolving, and uniformly mixing. The application method of the anti-discoloring protective agent comprises the following steps of: dissolving the anti-discoloring protective agent for silver plating in water, wherein the dosage is 50ml / L; keeping the temperature at 42-55 DEG C; and immersing a silver plating workpiece into the anti-discoloring protective agent for 1-3 minutes. The anti-discoloring protective agent for silver plating has the advantages of obvious oxidation resistance / vulcanization resistance, simple technological operation, strong wearresistance and the like, is easy in workpiece cleaning, is harmless to the environment, and basically has no influence on the electrical performance of a plating.

Description

technical field [0001] The invention relates to a post-treatment agent for metal plating, in particular to an anti-tarnish protective agent for silver plating and a preparation method and application method thereof. Background technique [0002] Silver has a bright and white appearance. It is a malleable and plastic precious metal with high reflectivity and chemical stability. Its weldability and ductility are also extremely good. Based on these excellent properties of silver, it has been widely used in the electronics industry, communication equipment, instrumentation, aircraft, optical instruments, high-frequency components and waveguides. In modern production, a layer of metal silver is generally plated on the surface of the base metal (such as copper) with good electrical conductivity, which not only makes it have the excellent properties of silver, but also saves costs. [0003] Although compared with many other metals, silver has good chemical stability and strong cor...

AI Technical Summary

Problems solved by technology

The solvent is an alcohol solvent, lipid solvent, water-soluble ether solvent or polar solvent, and the surfactant is a nonionic surfactant or a cationic surfactant. This technical solution is simple to prepare and low in cost, but the organic solvent contained therein Ethers, alcohols, dimethyl sulfone, etc., are highly volatile, resulting in harsh operating environments and greater physical damage to workers

[0010] There are many kinds of anti-tarnish protective agents for silver plating or gold plating in the current market. Many large foreign companies such as Lesi and Rohm and Haas have mature products on the market, but the price is very high, and many manufacturers cannot afford it; There are relatively few researches on such products. Therefore, it is necessary to develop a method that can effectively prevent the oxidation / sulfurization and discoloration reaction of the silver plating layer without affecting the various properties of the silver plating layer. It is also easy to operate, low in price, and environmentally friendly. Silver-plated anti-tarnish protective agent products have great market potential

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