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Chromium-free passivating agent and its preparation method and application

A chrome-free passivator and passivator technology, applied in the direction of metal material coating process, etc., can solve the problems of corrosion resistance that cannot achieve chromate passivation effect, unstable film-forming effect, and weak bonding ability. , to achieve good passivation effect, good film-forming effect and good gloss.

Active Publication Date: 2019-01-22
重庆市金思杰科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, molybdate passivation, silicate passivation, rare earth metal salt passivation and silane treatment are often used to passivate aluminum parts. However, the existing chromium-free passivation technologies are not resistant to Corrosion cannot achieve the effect of chromate passivation, and there are disadvantages such as unstable film formation effect, weak binding ability, and poor durability

Method used

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  • Chromium-free passivating agent and its preparation method and application
  • Chromium-free passivating agent and its preparation method and application
  • Chromium-free passivating agent and its preparation method and application

Examples

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preparation example Construction

[0067] According to another aspect of the present invention, the embodiment of the present invention also provides a method for preparing the above-mentioned chromium-free passivating agent, the method comprising the following steps:

[0068] Heat water to 95-100°C, add fluorozirconate, stir to dissolve, then add fluoride salt, stir evenly to form a mixed solution;

[0069] Add ammonium sulfate, cerium nitrate, sodium nitrate, potassium nitrate, borax, hydrofluoric acid, fluozirconic acid to the mixed solution, stir while adding, and stir for 50-90 minutes after adding all of them to form a passivating agent stock solution;

[0070] The stock solution of the passivating agent is left to stand for 6-9 hours, and then the supernatant liquid is taken out and stored in a precipitation tank for 6-9 hours to obtain a chromium-free passivating agent.

[0071] In the above preparation method, the preparation process of dissolving in boiling water and aging for the second time can shor...

Embodiment 1－5

[0089] Chromium-free passivating agent According to the ratio of raw materials shown in Table 1, an appropriate amount of each raw material was weighed, and the rest was distilled water to obtain the chromium-free passivating agent formula of Examples 1-5.

[0090] Table 1 embodiment 1-5 formula of chromium-free passivating agent

[0091] components

Example 1

Example 2

Example 3

Example 4

Example 5

Fluorozirconic acid

1.5％

1.6％

0.5％

2％

3％

hydrofluoric acid

0.8％

0.9％

0.4％

1％

2％

Borax

0.4％

0.5％

0.1％

1％

1.5％

Cerium nitrate

0.1％

0.12％

0.08％

0.2％

0.3％

sodium nitrate

0.2％

0.25％

0.05％

0.1％

0.5％

potassium nitrate

0.3％

0.4％

0.1％

0.8％

1％

ammonium sulfate

0.4％

0.5％

0.2％

0.8％

2％

sodium fluoride

0.5％

0.6％

0.3％

1.5％

3％

Potassium fluozirconate

1.5％

1.6％

0.5％

2％

3％ ...

experiment example 1

[0098] Adopt the raw material ratio of embodiment 1 to prepare chromium-free passivating agent according to the following method:

[0099] The difference between the steps of its preparation method and that of Example 1 is that the required passivating agent can be obtained without secondary aging. That is, add ammonium sulfate, cerium nitrate, sodium nitrate, potassium nitrate, borax, hydrofluoric acid, and fluozirconic acid to the mixed solution in turn, stir while adding, and stir for 60 minutes after adding all of them to obtain chromium-free passivation. agent.

[0100] All the other are identical with embodiment 1.

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Abstract

The invention relates to the technical field of metal passivation, in particular to a chromate-free passivation agent and a preparing method and application thereof. The chromate-free passivation agent is prepared from raw materials including, by weight percentage, 0.5%-3% of hexafluorozirconic acid, 0.4%-2% of hydrofluoric acid, 0.1%-1.5% of borax, 0.05%-0.3% of cerous nitrate, 0.05%-0.5% of sodium nitrate, 0.1%-1% of potassium nitrate, 0.1%-2% of ammonium sulfate, 0.1%-3% of fluoride salt, 0.5%-3% of fluozirconate and the balance water. The chromate-free passivation agent is non-toxic, harmless, free of environmental pollution, nonflammable, not flammable, good in passivation effect and high in corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of metal passivation, in particular to a chromium-free passivator and a preparation method and application thereof. Background technique [0002] During the processing, handling and transportation of aluminum parts, the surface will inevitably be oxidized or corroded, and with the passage of time, the performance of aluminum parts will be greatly reduced, although aluminum parts will form relatively The loose oxide film cannot play a real protective role, and at the same time, the surface of the aluminum part will also absorb some oil and impurities. In order to prevent such phenomena from happening, it is essential to treat the surface of aluminum parts. Aluminum parts include various aluminum products, among which aluminum alloy is the most widely used. Aluminum alloy is widely used in transportation, packaging containers, aerospace, household appliances, electronic communications, machinery manufacturing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34
CPCC23C22/34
Inventor 陈再兵
Owner 重庆市金思杰科技有限责任公司
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