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Chrome-free passivating liquid and passivating method for silver and silver coating

A chrome-free passivation and silver coating technology, applied in the coating process of metal materials, etc., can solve the problems of toxic environmental pollution, etc., and achieve the effects of good controllability, low cost, and simple passivation process

Active Publication Date: 2018-08-10
威海畅享海天新材料科技股份有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The passivation solution can not only solve the toxic environmental pollution problem of the traditional hexavalent chromium process, but also have high efficiency and energy saving, and improve the corrosion resistance of silver and silver coatings

Method used

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  • Chrome-free passivating liquid and passivating method for silver and silver coating

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Experimental program
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Effect test

Embodiment

[0023] A preparation and passivation method of silver and silver coating chromium-free passivation solution:

[0024] In a bath containing a chemically resistant material such as plastic, pour 2 / 3 of the volume of the bath with 60-70°C hot water. Then, add potassium molybdate or potassium tungstate, stir to dissolve, and then add potassium hypochlorite and potassium chloride. Adjust the amount of water so that it reaches the volume required for the experiment. The mass concentration of described potassium molybdate or potassium tungstate, potassium hypochlorite and potassium chloride is as shown in table 1. The experimental parts were immersed in the prepared passivation solution, the immersion temperature was 60°C, and the passivation time was shown in Table 1 to form a protective coating. Then, wash and dry the passivated experimental parts in clear water, and test the corrosion rate of the coatings obtained in each group of experiments. The measurement conditions are: wor...

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Abstract

The invention belongs to the surface technical field of metallurgical metal materials and discloses a chrome-free passivating liquid and a passivating method for silver and a silver coating. Molybdateor tungstate, a removing agent and a complexing agent are included. The molybdate or tungstate can be selected from one or more of alkali metal molybdate or alkali metal tungstate; the removing agentcan be selected from chloride; and the complexing agent can be selected from hypochlorite. According to a passivating manner, the silver and the silver coating are soaked in a prepared solution, thedipping time is 1-3 min, and the dipping temperature does not exceed 60 DEG C; and the silver and the silver coating are taken out, washed and dried, and a silver and silver coating passivating film is obtained. The passivating solution does not contain hexavalent or trivalent chromium harmful to human bodies and the envrionment, the passivating process is simple, cost is low, controllability is good, a film layer grows fast and is good in corrosion resistance, and industrialized popularization can be performed in the industrial field.

Description

technical field [0001] The invention relates to the technical field of metallurgical metal material surfaces, in particular to the technical field of obtaining protective and decorative coatings on silver and silver coatings by passivation. Background technique [0002] Silver and its products are widely used in the home appliance industry, electronics industry, aviation industry, jewelry industry, etc. Although silver is a noble metal and relatively stable chemically, it is still subject to corrosion. This phenomenon is caused by many external factors, the most influential of which is sulfur and its compounds. When metallic silver is corroded by sulfur and its compounds to form silver sulfide, its appearance becomes black or gray, which has a very adverse effect on the appearance and performance of metallic silver. [0003] At this stage, in terms of protecting the surface of metallic silver and silver coatings from corrosion, the practical methods used are: using other m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05
CPCC23C22/05
Inventor 何松
Owner 威海畅享海天新材料科技股份有限公司
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