Anticorrosion treatment process for converting/electro-statically spraying environment-friendly zirconium titanate on surfaces of aluminum alloys

A technology of aluminum alloy surface and conversion treatment, which is applied in the coating process of metal materials, the device for coating liquid on the surface, the coating, etc., to achieve the effects of simple configuration, good corrosion resistance and cost saving

Active Publication Date: 2015-12-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the film formed by this conversion method contains hexavalent chromium. Studies have shown that hexavalent chromium can cause lung cancer. The International Organization for Research on Cancer has listed hexavalent chromium as a carcinogenic substance for humans. method needs to be developed

Method used

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  • Anticorrosion treatment process for converting/electro-statically spraying environment-friendly zirconium titanate on surfaces of aluminum alloys
  • Anticorrosion treatment process for converting/electro-statically spraying environment-friendly zirconium titanate on surfaces of aluminum alloys
  • Anticorrosion treatment process for converting/electro-statically spraying environment-friendly zirconium titanate on surfaces of aluminum alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An anticorrosion treatment process of an aluminum alloy surface (6063 aluminum alloy surface) environment-friendly titanium-zirconium conversion treatment / electrostatic spraying, comprising the following steps:

[0038] (1) Sample preparation: 30mm × 30mm × 2mm aluminum sheets were cut from the 6063 aluminum alloy on-line. Each sample was punched at the corner, and the aluminum alloy surface was polished to 1200# with sandpaper, and rinsed with tap water and blown. Dry, hang with a thin wire at the hole;

[0039] (2) Pretreatment: Suspend the 6063 aluminum alloy sample in industrial acid and soak for 1.5min to degrease, rinse with tap water, then soak in mixed acid for 3min for activation treatment, and rinse with tap water; The composition is 80g / LH 2 SO 4 , 25g / LH 3 PO 4 , 10g / LHF, 0.5g / LOP-10 emulsifying agent, solvent is water; The composition of described mixed acid is 15g / LHNO 3 , 20g / LH 3 PO 4 , 25g / LH 2 SO 4 , the solvent is water;

[0040] (3) Treatme...

Embodiment 2

[0051] An environmentally friendly titanium-zirconium conversion film is prepared on the surface of industrial pure aluminum, and electrostatic spraying is carried out after drying. The process of preparing conversion coating and spraying in this example is the same as that of Example 1, except that industrial pure aluminum is used instead of 6063 aluminum alloy in this example.

[0052] The titanium-zirconium film on the aluminum plate on the surface of industrial pure aluminum obtained in Example 2 presents a uniform yellow color, and the organic coating covering it is uniform and bright black, and the film thickness of the titanium-zirconium film measured by an eddy current thickness gauge is 2 ~3μm, coating thickness is 60μm. The organic coating on the aluminum plate on the surface of industrial pure aluminum obtained in Example 2 is resistant to neutral salt spray corrosion for 700 hours. Using a 100-grid knife to conduct cross-cut tests under dry conditions and boiling ...

Embodiment 3

[0054] An anticorrosion treatment process of an aluminum alloy surface (6063 aluminum alloy surface) environment-friendly titanium-zirconium conversion treatment / electrostatic spraying, comprising the following steps:

[0055] (1) Sample preparation: Cut the 6063 aluminum alloy into 100mm×100mm×2mm aluminum sheets, punch holes in the corners of each piece, rinse with tap water and dry them, and hang them with iron wires for later use;

[0056] (2) Pretreatment: Suspend the 6063 aluminum alloy sample in industrial acid and soak for 2min to degrease, rinse with tap water, then soak in mixed acid for 3min for activation treatment, and rinse with tap water; the composition of the industrial acid 100g / LH 2 SO 4 , 20g / LH 3 PO 4 , 6g / LHF, 0.3g / LOP-10 emulsifier, solvent is water; The composition of described mixed acid is 20g / LHNO 3 , 19g / LH 3 PO 4 , 20g / LH 2 SO 4 , the solvent is water;

[0057] (3) Treatment solution preparation: prepare 200mL titanium-zirconium conversion...

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Abstract

The invention belongs to the technical field of chemical materials and discloses an anticorrosion treatment process for converting / electro-statically spraying environment-friendly zirconium titanate on surfaces of aluminum alloys. The anticorrosion treatment process comprises the following steps: (1) carrying out surface pretreatment on the aluminum alloys; (2) converting the surfaces of the aluminum alloys, putting the aluminum alloys subjected to surface pretreatment into a zirconium titanate converting solution, soaking, washing, standing and drying the aluminum alloys to obtain conversion films; (3) suspending the dried aluminum alloys in a powder spraying room and electro-statically spraying organic powder on the aluminum alloys; and (4) standing, preserving heat at 180-200 DEG C, then cooling to obtain anticorrosion coatings. According to the anticorrosion treatment process, the conversion treatment is low in film-forming temperature and short in film-forming time; the zirconium titanate treatment solution is stable, chromium-free and environmentally-friendly; through the treatment process, the surfaces of the aluminum alloys are high in corrosion resistance; the conversion films are excellent in combination with the aluminum alloys and the organic coatings.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and relates to metal surface corrosion and protection technology, in particular to an anticorrosion treatment process of environment-friendly titanium-zirconium conversion treatment / electrostatic spraying on the surface of aluminum alloys. Background technique [0002] The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and the content is very rich. Aluminum alloys are widely used in construction, aviation, electronic appliances, automobiles and other fields because of their advantages such as low density, high strength ratio, good machinability and good electrical and thermal conductivity. The output of aluminum alloy in the world is the second largest metal material next to steel. In 2014, China's aluminum output reached 48.4552 million tons, a year-on-year increase of 18.57%. Reached about 58 million tons. However, due to the poor corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/78C23G1/12B05D1/06
Inventor 李文芳祝闻杨雲予
Owner SOUTH CHINA UNIV OF TECH
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