Nickel passivation solution, preparation method thereof and method for passivating nickel surface

A technology of passivation solution and metal nickel, which is applied in the coating process of metal materials, etc., can solve the problems of short salt spray resistance time, high hexavalent chromium content, unsuitable organic passivation agent, etc., and achieve the extension of salt spray resistance time Effect

Active Publication Date: 2014-05-21
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problems of unstable passivation effect, short salt spray resistance time, high hexavalent chromium content in the hexavalent chromium-type passivator used in the prior art, which causes great harm to the environment and human body, and organic The technical problem that the passivation agent is not suitable for the surface of the plastic workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the following formula, first prepare the aqueous solution of sulfuric acid, then add chromic anhydride to the aqueous solution of sulfuric acid, stir until it is completely dissolved, then add fluoboric acid, stir until it dissolves and let it stand, and then add nano-silica with a particle size of 1nm when it is ready for use , to obtain the nickel passivation solution S1 of the present embodiment, which is composed of: 5 g / L of chromic anhydride, 45 g / L of sulfuric acid, 2 g / L of nano silicon dioxide, and 15 g / L of fluoroboric acid.

Embodiment 2

[0026] According to the following formula, first prepare the aqueous solution of sulfuric acid, then add chromic anhydride to the aqueous solution of sulfuric acid, stir until it is completely dissolved, then add fluoboric acid, stir until it dissolves and let it stand, and then add nano-silica with a particle size of 1nm when it is ready for use , to obtain the nickel passivation solution S2 of the present embodiment, which is composed of: 1 g / L of chromic anhydride, 20 g / L of sulfuric acid, 0.5 g / L of nano silicon dioxide, and 5 g / L of fluoboric acid.

Embodiment 3

[0028] According to the following formula, first prepare the aqueous solution of sulfuric acid, then add chromic anhydride to the aqueous solution of sulfuric acid, stir until it is completely dissolved, then add fluoboric acid, stir until it dissolves and let stand, then add nano-silica with a particle size of 1nm when it is ready for use , to obtain the nickel passivation solution S3 of the present embodiment, which is composed of: chromic anhydride 3g / L, sulfuric acid 35g / L, nano silicon dioxide 1.2g / L, fluoboric acid 12.5g / L.

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Abstract

The invention provides a nickel passivation solution and a preparation method thereof. The nickel passivation solution contains the following components: 1-5g/L of chromic anhydride, 20-50g/L of sulfuric acid, 0.5-2g/L of nano silica and 5-20g/L of fluoroboric acid. The invention also provides a method for passivating a nickel surface by adopting the nickel passivation solution. By adopting the nickel passivation solution provided by the invention, a stable and permanent passivation layer can be formed on the metallic nickel surface and the salt mist resistance time is greatly lengthened. Meanwhile, the nickel passivation solution provided by the invention has lower content of hexavalent chromium, is safe and environment-friendly and is suitable for plastic workpieces and workpieces with surfaces locally metalized.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a nickel passivation solution, a preparation method thereof and a nickel surface passivation method. Background technique [0002] Nickel plating is widely used in modern electroplating processes, but the surface of the nickel layer, especially the chemical nickel layer, has large pores, which is prone to potential corrosion and oxidative discoloration, and often has poor salt spray resistance, so passivation treatment is often required. What is commonly used in the prior art is a hexavalent chromium passivator. However, the passivation effect of hexavalent chromium-type passivators varies greatly with the content of hexavalent chromium, and the passivation effect is not stable at the same time. Usually, the salt spray resistance time after passivation with hexavalent chromium is 24-48 hours, which is difficult Longer salt spray test time. At the same time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/37
Inventor 韦家亮
Owner BYD CO LTD
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