Preparation method of environment-friendly self-healing type titanium/zirconium/molybdenum conversion film on surface of aluminum alloy

A technology of aluminum alloy surface and conversion coating, applied in the direction of metal material coating process, etc., can solve the problems of light color of titanium/zirconium conversion coating, complex film formation mechanism, and corrosion resistance not as good as chromate. Corrosion resistance, reduced equipment investment, low cost effects

Inactive Publication Date: 2018-08-03
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, although the growth process and film-forming mechanism of titanium / zirconium conversion film have been reported, in order to meet the needs of industrial production, the formula of titanium / zirconium conversion liquid is becoming more and more complicated, and the conversion liquid often contains organic additives. The film-forming mechanism is becoming more and more complicated, and the reported film-forming mechanism is no longer applicable
Secondly, the reported titanium / zirconium conversion coatings are generally lighter in color and less corrosion resistant than chromate

Method used

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  • Preparation method of environment-friendly self-healing type titanium/zirconium/molybdenum conversion film on surface of aluminum alloy
  • Preparation method of environment-friendly self-healing type titanium/zirconium/molybdenum conversion film on surface of aluminum alloy
  • Preparation method of environment-friendly self-healing type titanium/zirconium/molybdenum conversion film on surface of aluminum alloy

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Embodiment 1

[0032] A method for preparing an environment-friendly self-healing titanium / zirconium / molybdenum conversion film on the surface of an aluminum alloy, comprising the following steps:

[0033] Surface pretreatment of aluminum alloy specimens. First of all, sample preparation is carried out. An aluminum sheet sample with a size of 20mm×20mm×2mm is obtained from 6061 aluminum alloy on-line cutting. Each sample is punched at the corner, and the surface of the sample is polished to 1200 mesh with sandpaper, and rinsed with tap water. Blow dry and hang with thin wire over punched holes.

[0034] The 6061 aluminum alloy sample was suspended in industrial acid and soaked for 2 minutes to remove oil, rinsed with tap water, then soaked in mixed acid for 3 minutes for activation treatment, and rinsed with tap water. The composition of described industrial acid is 40g / L H 2 SO 4 , 15g / LH 3 PO 4 , 8g / L HF, 0.8g / L OP-10 emulsifier, the solvent is water, and the total volume of the indus...

Embodiment 2

[0041] A method for preparing an environment-friendly self-healing titanium / zirconium / molybdenum conversion film on the surface of an aluminum alloy, comprising the following steps:

[0042]Surface pretreatment of aluminum alloy specimens. First of all, prepare the sample. Cut the 6062 aluminum alloy on-line to obtain an aluminum sheet sample with a size of 20mm×20mm×2mm. Each sample is punched at the corner, and the surface of the sample is polished to 1200 mesh with sandpaper, and rinsed with tap water. Blow dry and hang with thin wire over punched holes.

[0043] The 6062 aluminum alloy sample was suspended in industrial acid and soaked for 3 minutes to remove oil, rinsed with tap water, then soaked in mixed acid for 5 minutes for activation treatment, and rinsed with tap water. The composition of described industrial acid is 80g / L H 2 SO 4 , 30g / LH 3 PO 4 , 10g / L HF, 2.8g / L OP-10 emulsifier, the solvent is water, and the total volume of the industrial acid formed is 1...

Embodiment 3

[0049] A method for preparing an environment-friendly self-healing titanium / zirconium / molybdenum conversion film on the surface of an aluminum alloy, comprising the following steps:

[0050] Surface pretreatment of aluminum alloy specimens. First of all, prepare the sample. Cut the 6063 aluminum alloy on-line to obtain an aluminum sheet sample with a size of 20mm×20mm×2mm. Each sample is punched at the corner, and the surface of the sample is polished to 1200 mesh with sandpaper, and rinsed with tap water. Blow dry and hang with thin wire over punched holes.

[0051] The 6063 aluminum alloy sample was suspended in industrial acid and soaked for 3 minutes to remove oil, rinsed with tap water, then soaked in mixed acid for 5 minutes for activation treatment, and rinsed with tap water. The composition of described industrial acid is 80g / L H 2 SO 4 , 30g / LH 3 PO 4 , 10g / L HF, 2.8g / L OP-10 emulsifier, the solvent is water, and the total volume of the industrial acid formed is ...

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Abstract

The invention provides a preparation method of an environment-friendly self-healing type titanium/zirconium/molybdenum conversion film on the surface of aluminum alloy. The preparation method comprises the following steps that surface pretreatment is conducted on each aluminum alloy sample; a conversion solution is compounded, wherein the conversion solution comprises 0.5-5 g/L of fluotitanate, 0.5-3 g/L of fluozirconate, 1-6 g/L of molybdate, 0.2-3 g/L of a chelating agent, 0.3-3 g/L of a film formation additive and 0.2-0.5 g/L of a pH value adjustment agent, water is added after all components are mixed, stirring is conducted for 30-50 minutes, then, sealing is conducted, and aging is conducted for one day; the conversion film is prepared, wherein each aluminum alloy sample is soaked inthe conversion solution, the continuous and uniform faint-yellow titanium/zirconium/molybdenum conversion film can be formed on the surface of the aluminum alloy, the aluminum alloy samples are takenout and thoroughly cleaned through distilled water, and drying is conducted, so that preparation of the conversion film is completed. By means of the preparation method, the film formation temperatureis low, the film formation time is short, the conversion solution is stable, no chromium is adopted, and environmental friendliness is achieved; the surface of the aluminum alloy is good in corrosionresistance and capable of achieving self-healing; and the preparation method is applicable to various types of aluminum alloy.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly self-healing titanium / zirconium / molybdenum conversion film on the surface of an aluminum alloy. Background technique [0002] The most commonly used treatment process for aluminum alloy surface protection is to carry out surface chemical conversion treatment first, and then carry out electrostatic spraying. The traditional surface conversion treatment process is chromate conversion treatment, but hexavalent chromium is toxic and has been banned in many countries. The research on the chromium-free treatment technology and mechanism is imminent, but the chromium-free conversion treatment technology on the surface of aluminum and its alloys is mainly in the hands of developed countries, which restricts the development of this industry in China. Therefore, it is necessary to research and develop the surface protection treatment process of aluminum and its alloys and analyze that it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44
CPCC23C22/44
Inventor 祝闻廖忠淼李文芳
Owner DONGGUAN UNIV OF TECH
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