A kind of environment-friendly zinc-nickel alloy black passivation solution and its application method

A zinc-nickel alloy and passivation solution technology, applied in the field of passivation solution, can solve the problems of destroying the mechanical isolation effect, affecting the appearance of the film layer, poor salt spray resistance, etc., achieving uniform appearance of the film layer and satisfying high corrosion resistance. With excellent decorative, high stability effect

Active Publication Date: 2021-03-05
SHANGHAI DEXIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the film layer produced by the trivalent chromium black passivation agent process is relatively thick, which is easy to mud crack, destroys its mechanical isolation, and has poor corrosion resistance. Trivalent chromium passivation still has many shortcomings in terms of corrosion resistance and appearance. insufficient
And because there are metal salts and oxidants in the passivation solution without hexavalent chromium rust prevention treatment, because a large amount of oxidants are used, trivalent chromium may be oxidized to form hexavalent chromium
In addition, it has been reported in the literature that the use of silica as a sealant to fill the gaps in the film layer is not only complicated in process but also seriously affects the appearance of the film layer, and the blackness is significantly reduced.
Therefore, most trivalent chromium passivation processes cannot have both high corrosion resistance and good decoration, poor salt spray resistance, and easy mud cracking

Method used

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  • A kind of environment-friendly zinc-nickel alloy black passivation solution and its application method
  • A kind of environment-friendly zinc-nickel alloy black passivation solution and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] An environment-friendly zinc-nickel alloy black passivation solution, by weight percentage, raw materials include 32% trivalent chromium salt hydrate, 6% cobalt salt hydrate, 1% unsaturated ethylenic acid, 10% weak acid, and water to make up the rest quantity.

[0048] The weak acid is a combination of hydrofluoric acid and glacial acetic acid; the weight ratio of the hydrofluoric acid and glacial acetic acid is 1:4, and the hydrofluoric acid is a hydrofluoric acid aqueous solution with a mass concentration of 40%.

[0049] The trivalent chromium salt hydrate is chromium nitrate nonahydrate; the cobalt salt hydrate is cobalt nitrate hexahydrate; and the unsaturated ethylenic acid is maleic acid.

[0050] The preparation steps of the zinc-nickel alloy black passivation solution are as follows: add trivalent chromium salt hydrate into water, stir until completely dissolved; then add weak acid, unsaturated ethylenic acid, and cobalt salt hydrate in sequence, and heat up to...

Embodiment 2

[0053] An environment-friendly zinc-nickel alloy black passivation solution, the raw materials include, by weight percentage, 25% trivalent chromium salt hydrate, 3% cobalt salt hydrate, 0.5% unsaturated ethylenic acid, 5% weak acid, and water to make up the rest quantity.

[0054] The weak acid is a combination of oxalic acid and glacial acetic acid; the weight ratio of hydrofluoric acid and glacial acetic acid is 1:2, and the hydrofluoric acid is a hydrofluoric acid aqueous solution with a mass concentration of 40%.

[0055] The trivalent chromium salt hydrate is chromium sulfate hexahydrate; the cobalt salt hydrate is cobalt nitrate hexahydrate; and the unsaturated ethylenic acid is citraconic acid.

[0056] The preparation steps of the zinc-nickel alloy black passivation solution are as follows: add trivalent chromium salt hydrate into water, stir until completely dissolved; then add weak acid, unsaturated ethylenic acid, and cobalt salt hydrate in sequence, and heat up to...

Embodiment 3

[0059] An environment-friendly zinc-nickel alloy black passivation solution, the raw materials include 35% trivalent chromium salt hydrate, 8% cobalt salt hydrate, 1.5% unsaturated ethylenic acid, 12% weak acid, and water to make up the rest quantity.

[0060] The weak acid is a combination of hydrofluoric acid, glacial acetic acid and oxalic acid; the weight ratio of the hydrofluoric acid and glacial acetic acid is 1:6:0.5, and the hydrofluoric acid is a hydrofluoric acid aqueous solution with a mass concentration of 40%.

[0061] The trivalent chromium salt hydrate is chromium nitrate nonahydrate; the cobalt salt hydrate is cobalt nitrate hexahydrate; and the unsaturated ethylenic acid is maleic acid.

[0062] The preparation steps of the zinc-nickel alloy black passivation solution are as follows: add trivalent chromium salt hydrate into water, stir until completely dissolved; then add weak acid, unsaturated ethylenic acid, and cobalt salt hydrate in sequence, and heat up t...

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Abstract

The invention relates to the field of passivation solution, and provides an environment-friendly zinc-nickel alloy black passivation solution. The raw materials include at least 25-35% of trivalent chromium salt hydrate and 3-8% of cobalt salt hydrate in terms of weight percentage. , 0.5-1.5% unsaturated ethylenic acid, 5-12% weak acid, and water to make up the balance; the weak acid is selected from one or more combinations of hydrofluoric acid, glacial acetic acid, oxalic acid, and acetic acid. Also provided is a method for using the zinc-nickel alloy black passivation solution.

Description

technical field [0001] The invention relates to the field of passivation solution, in particular to an environment-friendly zinc-nickel alloy black passivation solution and a method for using the same. Background technique [0002] Black passivation of galvanized and zinc alloy is one of the methods to obtain black decorative layer. Compared with other methods to obtain black decorative layer such as black chrome plating, black nickel, blue steel, galvanized layer coloring, etc., it has simple processing technology , low cost and good corrosion resistance. Galvanized and zinc alloy black passivation has the advantages of both decorative coating and corrosion-resistant coating. The coating after black passivation has good corrosion resistance and bonding force, and is pure black and shiny, with uniform and beautiful tones, which can reduce visual fatigue and eliminate Scatter light, prevent diffuse scattering, and meet the decorative and functional requirements of modern ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/46
CPCC23C22/34C23C22/46
Inventor 何查里陈浩峰
Owner SHANGHAI DEXIU CHEM CO LTD
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