Gold and silver surface anti-oxidation and anti-color-change protecting agent and preparation method and application thereof

Abstract

The invention discloses a gold and silver surface anti-oxidation and anti-color-change protecting agent and a preparation method and application thereof, and belongs to the technical field of gold andsilver plating layer protecting agents. The protecting agent comprises the following components in parts by weight: 15-30 parts of color change preventing agents, 10-15 parts of film forming agents,3-8 parts of alcohol ether solvents, 30-50 parts of emulsifying agents, 2-5 parts of benzethonium chloride, 5-10 parts of carboxylic acid type deoxidants, 1-3 parts of corrosion inhibitors, 0.5-1 partof antioxidants, 1-3 parts of brightening agents, and 5-20 parts of water. The prepared protecting agent can form double layers of protecting films to effectively prevent oxidation of gold and silverplating layers by air and corrosion by acid and alkali; meanwhile, the surface corrosion and color change resistance of the plating layers is improved; the brightness of the plating layers is improved; the performances of higher brightness and efficiency are given to the plating layers; the protecting agent also can be applied to surface protection of copper substrates, and the effect can rival chromium salt protecting films; the copper surface colors can be not changed for a long time; the effect of low poison is achieved; and the treatment process is simple.

Description

technical field [0001] The invention belongs to the technical field of gold and silver plating protective agents, in particular to a gold and silver surface anti-oxidation and anti-discoloration protective agent and its preparation method and application. Background technique [0002] Both gold and silver are precious metals, which have been widely used in the surface treatment industry due to their relatively stable chemical activity and good brightening effect. The gold-plated silver layer can be applied on the surface of electronic products to improve the oxidation resistance and conductivity of the product, and can also improve the brightness of hardware jewelry, and it is also used in the fields of automobiles, medical equipment, construction, machinery manufacturing, aviation, aerospace, ships, etc. . However, long-term exposure of gold and silver coatings to the air or immersion in river water and seawater tends to produce black oxide films. This layer of oxide film ...

AI Technical Summary

Problems solved by technology

This type of protective agent will affect the weldability and conductivity of the coating, and the persistence of the bright effect is relatively poor. At the same time, it is difficult to remove the oil layer protection and will damage the surface of the coating, which indirectly leads to increased costs and waste of resources.

[0004] In addition, the protective agent on the market that relies solely on alkyl mercaptan as an anti-tarnish agent, its thin protective layer is also easily damaged by external factors, thus losing the protection of the coating

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