A kind of nickel passivation liquid and its preparation method and the method for nickel surface passivation

A passivation solution, metal nickel technology, applied in the direction of metal material coating process, etc., can solve the problems of short salt spray resistance, environmental and human harm, and high hexavalent chromium content, so as to prolong the salt spray resistance time and improve the resistance to salt spray. The effect of acidity and alkalinity

Active Publication Date: 2017-05-31
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the technical problems that the passivation effect of the hexavalent chromium-type passivator used in the prior art is unstable, the salt spray resistance time is short, and the high content of hexavalent chromium causes great harm to the environment and human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the following formula, first prepare the phosphoric acid aqueous solution, then add chromic anhydride to the phosphoric acid aqueous solution, stir until it is completely dissolved, then add dimethylformamide, stir until it dissolves and let stand, then add methyl triethoxy Silane, to obtain the nickel passivation solution S1 of the present embodiment, its composition is: chromic anhydride 6g / L, phosphoric acid 70g / L, dimethylformamide 40g / L, methyltriethoxysilane 5g / L.

Embodiment 2

[0021] First prepare phosphoric acid aqueous solution according to the following formula, then add chromic anhydride to the phosphoric acid aqueous solution, stir until completely dissolved, then add dimethylformamide, stir until dissolved and let stand, then add methyltriethoxysilane when ready to use , to obtain the nickel passivation solution S2 of the present embodiment, which is composed of: 1 g / L of chromic anhydride, 30 g / L of phosphoric acid, 20 g / L of dimethylformamide, and 1 g / L of methyltriethoxysilane.

Embodiment 3

[0023] First prepare phosphoric acid aqueous solution according to the following formula, then add chromic anhydride to the phosphoric acid aqueous solution, stir until completely dissolved, then add dimethylformamide, stir until dissolved and let stand, then add methyltriethoxysilane when ready to use , to obtain the nickel passivation solution S3 of the present embodiment, which is composed of: 10 g / L of chromic anhydride, 100 g / L of phosphoric acid, 50 g / L of dimethylformamide, and 10 g / L of methyltriethoxysilane.

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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: 1-10g / L of chromic anhydride, 30-100g / L of phosphoric acid, 20-50g / L of dimethylformamide and 1-10g / L of methyl triethoxysilane. 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 and is safe and environment-friendly.

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 Patents(China)
IPC IPC(8): C23C22/33
Inventor 韦家亮
Owner BYD CO LTD
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