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Chromium-free passivant and preparation method thereof

A chromium-free passivation agent and a production method technology, applied in the direction of metal material coating process and the like, can solve problems such as lack of cost, and achieve the effects of low cost, elimination of heavy metals, and improvement of adhesion

Inactive Publication Date: 2017-05-17
宁波际超新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is currently a lack of low-cost, environmentally friendly and non-toxic passivators for aluminum products

Method used

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  • Chromium-free passivant and preparation method thereof
  • Chromium-free passivant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A chromium-free passivating agent, comprising 2 parts of fluozirconic acid, 10 parts of water-based resin, 1 part of phytic acid, 3 parts of silane coupling agent, and 5 parts of bone charcoal.

[0021] A preparation method of a chromium-free passivating agent, comprising the following steps:

[0022] 1) uniformly mixing fluozirconic acid, water-based resin, and phytic acid to obtain a solvent;

[0023] 2) Pour the silane coupling agent and bone char into the solvent, and stir for 60 minutes to obtain a chromium-free passivator.

Embodiment 2

[0025] A chromium-free passivator, comprising 8 parts of fluozirconic acid, 20 parts of water-based resin, 5 parts of phytic acid, 10 parts of silane coupling agent, and 10 parts of bone char.

[0026] A preparation method of a chromium-free passivating agent, comprising the following steps:

[0027] 1) uniformly mixing fluozirconic acid, water-based resin, and phytic acid to obtain a solvent;

[0028] 2) Pour the silane coupling agent and bone char into the solvent, and stir for 80 minutes to obtain a chromium-free passivator.

Embodiment 3

[0030] A chromium-free passivating agent, comprising 4 parts of fluozirconic acid, 12 parts of water-based resin, 2 parts of phytic acid, 5 parts of silane coupling agent, and 5 parts of bone charcoal.

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Abstract

The invention discloses a chromium-free passivant composed of the following raw materials of, by weight, 2-8 parts of hexafluorozirconic acid, 10-20 parts of water-base resin, 1-5 parts of phytic acid, 3-10 parts of a silane coupling agent, and 5-10 parts of bone black. According to the formula, the heavy metal chromium is not introduced, and heavy metals in water can be removed. The invention further discloses a preparation method for the chromium-free passivant.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a chromium-free passivator and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloy products are easy to pollute and have poor corrosion resistance in a humid acidic atmosphere, so passivation or sealing treatment should be carried out after dyeing to improve their corrosion resistance. Chromate passivation is an excellent anti-corrosion agent and has been widely used in metal surface treatment. Since hexavalent chromium is a heavy metal, it is highly toxic and causes great harm to the environment and human health. CN201210234383.X discloses a rare earth modified aluminum alloy chromium-free passivator for aluminum alloy surface treatment, including ammonium persulfate, fluozirconic acid, sodium dodecylbenzenesulfonate, ammonia water and rare earth additives (cerium chloride , lanthanum chloride, cerium nitrate, lanthanum nitra...

Claims

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Application Information

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IPC IPC(8): C23C22/34
CPCC23C22/34C23C2222/20
Inventor 李啸春李春山校新克
Owner 宁波际超新材料科技有限公司
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