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
CN106676508AInactive Publication Date: 2017-05-17宁波际超新材料科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
宁波际超新材料科技有限公司
Publication Date
2017-05-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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