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Chromium-free passivator

A chromium-free passivator and corrosion inhibitor technology, applied in the coating process of metal materials, etc., can solve problems such as uneven corrosion resistance of substrates, waste of bath solution cost, and influence on the formation of passivation film

Inactive Publication Date: 2020-01-10
东莞市精诚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the traditional aluminum alloy passivation process, the chromium-acid system is generally used to passivate the aluminum alloy. However, due to the increasingly stringent environmental protection, the chromium-acid system has been gradually eliminated. At present, fluorozirconate is the most widely used system or fluorotitanate system, but the stability of these two systems is not good, and the working fluid is prone to produce insoluble suspended matter, which affects the formation of the passivation film, resulting in uneven corrosion resistance and poor corrosion resistance of the substrate. Using the current fluorozirconate system or fluorotitanate system to chromize aluminum alloys, the salt spray test time is only 48-120 hours, and the bath needs to be replaced every half a month, resulting in a waste of bath and high cost of use

Method used

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  • Chromium-free passivator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A chromium-free passivator, which is composed of the following components by weight: rare earth metal salt A: 8.5%, corrosion inhibitor: 6%, rare earth metal salt B: 3.5%, metal salt: 3.5%, water-based acrylic resin: 2.6% , Film-forming aid A: 1.2%, complexing agent: 0.55%, film-forming aid B: 0.4%, cellulose ether: 0.15% and deionized water: 73.6%.

[0027] Wherein, the rare earth metal salt A is lanthanum chloride ( ) heptahydrate.

[0028] Wherein, the corrosion inhibitor is gallic acid.

[0029] Wherein, the rare earth metal salt B is cerium chloride.

[0030] Wherein, the metal salt is cobalt nitrate.

[0031] Wherein, the film-forming aid A is fluorozirconic acid.

[0032] Wherein, the complexing agent is disodium edetate.

[0033] Wherein, the film-forming aid B is tannic acid.

[0034] Wherein, the cellulose ether is hydroxymethylcellulose.

Embodiment 2

[0036] A chromium-free passivating agent, composed of the following components by weight: rare earth metal salt A: 9%, corrosion inhibitor: 7%, rare earth metal salt B: 4%, metal salt: 4%, water-based acrylic resin: 2.8% , Film-forming aid A: 1.4%, complexing agent: 0.5%, film-forming aid B: 0.5%, cellulose ether: 0.18% and deionized water: 70.62%.

[0037] Wherein, the rare earth metal salt A is lanthanum chloride ( ) heptahydrate.

[0038] Wherein, the corrosion inhibitor is gallic acid.

[0039] Wherein, the rare earth metal salt B is cerium chloride.

[0040] Wherein, the metal salt is cobalt nitrate.

[0041] Wherein, the film-forming aid A is fluorozirconic acid.

[0042] Wherein, the complexing agent is disodium edetate.

[0043] Wherein, the film-forming aid B is tannic acid.

[0044] Wherein, the cellulose ether is hydroxymethylcellulose.

Embodiment 3

[0046] A chromium-free passivator, which consists of the following components by weight: rare earth metal salt A: 10%, corrosion inhibitor: 5.5%, rare earth metal salt B: 5%, metal salt: 4.5%, water-based acrylic resin: 3% , Film-forming aid A: 1.5%, complexing agent: 0.6%, film-forming aid B: 0.6%, cellulose ether: 0.2% and deionized water: 69.1%.

[0047] Wherein, the rare earth metal salt A is lanthanum chloride ( ) heptahydrate.

[0048] Wherein, the corrosion inhibitor is gallic acid.

[0049] Wherein, the rare earth metal salt B is cerium chloride.

[0050] Wherein, the metal salt is cobalt nitrate.

[0051] Wherein, the film-forming aid A is fluorozirconic acid.

[0052] Wherein, the complexing agent is disodium edetate.

[0053] Wherein, the film-forming aid B is tannic acid.

[0054] Wherein, the cellulose ether is hydroxymethylcellulose.

[0055] In one of the embodiments, the chromium-free passivating agent is mainly applied to the surface passivation of alumi...

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Abstract

Provided is a chromium-free passivator. The chromium-free passivator comprises a rare earth metal salt A, a corrosion inhibitor, a rare earth metal salt B, a metal salt, aqueous acrylic resin, a coalescing agent A, a complexing agent, a coalescing agent B, cellulose ethers and deionized water. The chromium-free passivator has higher corrosion resistance, and the corrosion resistance of a base material is enhanced by enhancing the performance of a passivation film, so that the salt spray test time of the base material can be effectively prolonged to be 72-168 h. An agent prepared from the chromium-free passivator is not volatile and free of any toxic substances, heavy metals, organic pollutants and irritating odors, no harm is caused to the human body, emissions does not pollute the environment, the consumption is small, the use amount of the agent can be reduced, the working environment of operation staff can be effectively improved, and the instruction requirements of the European Union WEEE RoHS can be effectively met. The chromium-free passivator can be contained in a container made of stainless steel, PVC or the like, and is more convenient to use.

Description

technical field [0001] The invention relates to the field of surface passivation applied to aluminum alloys, in particular to a chromium-free passivation agent. Background technique [0002] Aluminum alloy is the most widely used alloy at present. It has the advantages of low density and smaller mass under the same volume, but its strength is higher, and its strength is close to or even exceeds that of steel. Secondly, aluminum alloy has strong plasticity and the precision of manufactured parts High, and has excellent thermal conductivity and electrical conductivity. Under the requirements of different mechanical properties and physical properties, different types of elements can be introduced according to requirements to meet production needs. Therefore, with the continuous improvement of technological level and production conditions, the application of aluminum alloy will be more extensive. [0003] In the traditional aluminum alloy passivation process, the chromium-acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56
CPCC23C22/56
Inventor 粟飞
Owner 东莞市精诚环保科技有限公司
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