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Chromate-free passivation agent for aluminum alloy

A chromium-free passivator and aluminum alloy technology, which is applied in the coating process of metal materials, can solve the problems of passivation effect hexavalent chromium technology gap and troubles, and achieve the goal of improving physical bonding ability, enhancing thickness and density Effect

Inactive Publication Date: 2016-07-20
NANJING KERUN LUBRICANTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a certain gap between the passivation effect of these chromium-free passivation technologies and the hexavalent chromium technology.
In addition, the traditional hexavalent chromium passivation agent can show a certain color on the film layer formed on the aluminum alloy surface, which is convenient for the operator to judge the reaction process, while the current chromium-free passivation technology forms the film layer on the aluminum alloy surface. It is colorless, which makes it difficult for field operators to judge whether a film is formed

Method used

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  • Chromate-free passivation agent for aluminum alloy

Examples

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Effect test

Embodiment 1

[0021] A chromium-free passivator suitable for aluminum alloys, consisting of the following components: 200ppm N-methyl-γ-aminopropyltrimethoxysilane, 40ppmγ-glycidyloxypropylmethyldiethoxysilane , 40ppm nano-scale SiO 2 Particles, 10ppm nanoscale ZrO 2 Particles, 250ppm potassium fluozirconate (calculated as zirconium), 200ppm fluotitanic acid (calculated as titanium), 100ppm cerium nitrate (calculated as cerium), 40ppm cobalt nitrate (calculated as cobalt), 100ppm sodium fluoride, 10ppm sodium citrate , 25ppm ATMP, 50ppm HEDP, 30ppm non-ionic surfactant and water balance.

Embodiment 2

[0023] A chromium-free passivator suitable for aluminum alloys, consisting of the following components: 50ppm γ-aminopropyltriethoxysilane, 100ppm γ-(2,3-glycidyloxy)propyltrimethoxysilane, 30ppm Nanoscale TiO2 particles, 20ppm nanoscale CeO 2 Particles, 50ppm nano-sized SiO 2 Particles, 120ppm 45% fluozirconic acid (calculated as zirconium), 60ppm potassium fluotitanate (calculated as titanium), 10ppm copper nitrate (calculated as copper), 50ppm cerium nitrate (calculated as cerium), 60ppm cobalt nitrate (calculated as cobalt) , 150ppm potassium fluoride, 15ppm oxalic acid, 50ppm HEDP, 30ppm HPMA, 50ppm non-ionic surfactant and water balance.

Embodiment 3

[0025] A chromium-free passivator suitable for aluminum alloys, consisting of the following components: 240ppmN, N-diethyl-γ-aminopropyltrimethoxysilane, 60ppm2-(3,4-epoxycyclohexyl)ethyl Triethoxysilane, 40ppm nano-sized SiO 2 Particles, 30ppm nano TiO 2 Particles, 30ppm nano-sized CuO nanoparticles, 250ppm potassium fluozirconate (calculated as zirconium), 250ppm fluotitanic acid (calculated as titanium), 90ppm cerium nitrate (calculated as cerium), 60ppm cobalt nitrate (calculated as cobalt), 150ppm fluorine Sodium chloride, 10ppm sodium citrate, 10ppm succinic acid, 50ppmEDTMP, 20ppmPBTCA, 30ppmHPMA, 30ppm nonionic surfactant and water balance.

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Abstract

The invention discloses a chromate-free passivation agent for an aluminum alloy. Per liter of chromate-free passivation agent is composed of, by mass, 10 mg to 300 mg of amino silane or / and epoxy silane, 1 mg-100 mg of dispersible nano particles, 10 mg-500 mg of a zirconium compound or / and a titanium compound, 1 mg-150 mg of metal ions, 10 mg-150 mg of fluoride, 1 mg-20 mg of a complexing agent, 75 mg-100 mg of organic phosphoric acid and the balance water; and the organic phosphoric acid is at least two of HEDP, HPMA, EDTMP, DTPMP, ATMP and PBTCA. According to the passivation agent, multiple kinds of organic phosphoric acid, multiple kinds of metal ions and multiple kinds of nano particles are chelated to the different degrees; on one aspect, the thickness and the compactness of a passivation film layer can be strengthened; and meanwhile, the passivation film layer (inorganic film layer) formed after chelation can show a color to a certain degree on the surface of the aluminum alloy.

Description

technical field [0001] The invention relates to a passivating agent free of chromium and manganese elements, in particular to a chromium-free passivating agent suitable for aluminum alloys before coating. Background technique [0002] Aluminum alloy workpieces such as aluminum profiles or aluminum wheels usually need surface treatment before painting to enhance the adhesion between the metal and the paint. At present, the aluminum alloy surface treatment technology before painting mostly adopts hexavalent chromium passivation treatment process . However, this treatment method contains heavy metal ions of hexavalent chromium, which is highly toxic and seriously pollutes the environment. The implementation of the EU RoHS environmental protection directive has put forward clear restrictions on harmful substances such as hexavalent chromium. Therefore, in recent years, the research on the chromium-free technology of aluminum alloy surface treatment has been a hot spot at home a...

Claims

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Application Information

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IPC IPC(8): C23C22/34
CPCC23C22/34C23C2222/20
Inventor 聂晓霖赵凯利王成孙振华魏大力
Owner NANJING KERUN LUBRICANTS
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