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Phosphating solution and phosphating method for aluminum alloy surface treatment

A technology of aluminum alloy surface and aluminum alloy, which is applied in the direction of metal material coating process, etc., can solve the problems of heavy film, high service temperature, complex composition, etc., and achieve uniform and dense film, good corrosion resistance and low processing cost Effect

Inactive Publication Date: 2019-01-29
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used aluminum phosphating solution has a loose film and a heavy film weight, resulting in poor adhesion between the phosphating film and the paint film, and poor corrosion resistance; the phosphating crystals are large in size, needle-shaped or massive, and have no granular shape crystallization
[0003] Chinese invention patent application CN103451639A discloses a phosphating method for aluminum alloy products. The patent only mentions that the main component and concentration of the phosphating solution are ZnO 5-10g / L, H 3 PO 4 10-20g / L, the type and content of the accelerator are not disclosed, the prepared phosphating film has uneven coverage and poor corrosion resistance
Chinese patent CN101307440A discloses a phosphating solution for aluminum alloys and ferrous metals, the formula of which is: phosphoric acid 155-165g / L, zinc nitrate 163-167g / L, potassium permanganate 0.1-0.2g / L, alkylbenzenesulfonate Sodium Oxide 2.2~2.4g / L, Zinc Oxide 42~48g / L, Hydrofluoric Acid 5~6g / L, the formula contains potassium permanganate, resulting in low stability of the phosphating solution, and the patent is not disclosed Process parameters of phosphating solution, inconvenient to use
Chinese invention patent application CN104357824A discloses a phosphating solution for surface treatment of aluminum products, which contains 60-65% of phosphoric acid, oxalic acid, acrylic acid, hydrofluoric acid, zinc dihydrogen phosphate, ammonium molybdate, chromium sulfate, nickel nitrate, Cobalt naphthenate, zinc tetrabasic chromate, defoamer, dispersant, distilled water, the composition is complex, the service temperature is high, and it also contains chromium, which is not suitable for industrialization

Method used

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  • Phosphating solution and phosphating method for aluminum alloy surface treatment

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Experimental program
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Effect test

Embodiment 1

[0021] The formula that adopts phosphating solution in the present embodiment is: zinc dihydrogen phosphate 18g, zinc nitrate 55g, 85% phosphoric acid 3.2g, nickel nitrate 9g, sodium fluoride 2.0g, sodium chlorate 2.0g, sodium nitrite 2.5g, Guanidine nitrate 1.4g, hydroxylamine sulfate 2.8g, phytic acid 1.2g. Dissolve the above compounds in deionized water, prepare 1 liter of phosphating solution, and adjust the pH value to 3.5-3.7 with 1 mol / L sodium hydroxide solution.

[0022] Phosphating method: grind and polish the aluminum alloy sheet with No. 240, No. 360, No. 600, and No. 1200 water-grinding sandpaper in sequence, degrease with acetone, and clean with deionized water; then immerse the aluminum alloy test piece in a concentration of 1.0mol / L , washed with alkali at a temperature of 65°C for 50 seconds to remove the natural oxide film, immediately immersed in 1.0mol / L nitric acid solution for neutralization for 20 seconds after taking it out, rinsed with deionized water,...

Embodiment 2

[0025] The formula that adopts phosphating solution in the present embodiment is: zinc dihydrogen phosphate 20g, zinc nitrate 50g, 85% phosphoric acid 3.0g, nickel nitrate 8g, sodium fluoride 2.2g, sodium chlorate 1.8g, sodium nitrite 3.0g, Guanidine nitrate 1.2g, hydroxylamine sulfate 3.0g, phytic acid 1.5g. Dissolve the above compounds in deionized water, prepare 1 liter of phosphating solution, and adjust the pH value to 3.5-3.7 with 1 mol / L sodium hydroxide solution.

[0026] Phosphating method: the pre-treatment and post-treatment processes of the aluminum alloy are exactly the same as the above-mentioned embodiment 1. The difference is: the phosphating process controls the reaction temperature to 50°C, and the phosphating reaction time is controlled to 10 minutes.

[0027] The phosphating film on the surface of the phosphating aluminum alloy is tested, the appearance is gray-black, uniform and dense, the film is thin, and the film weight is 3.5g / m 2 ; Copper sulfate dr...

Embodiment 3

[0029] The formula that adopts phosphating solution in the present embodiment is: zinc dihydrogen phosphate 23g, zinc nitrate 60g, 85% phosphoric acid 3.0g, nickel nitrate 6g, sodium fluoride 2.5g, sodium chlorate 1.5g, sodium nitrite 2.8g, Guanidine nitrate 1.5g, hydroxylamine sulfate 3.2g, phytic acid 1.0g. Dissolve the above compounds in deionized water, prepare 1 liter of phosphating solution, and adjust the pH value to 3.5-3.7 with 1 mol / L sodium hydroxide solution.

[0030] Phosphating method: the pre-treatment and post-treatment processes of the aluminum alloy are exactly the same as the above-mentioned embodiment 1. The difference is that the phosphating process controls the reaction temperature to 45°C, and the phosphating reaction time is controlled to 15 minutes.

[0031] The phosphating film on the surface of the phosphating aluminum alloy is tested, the appearance is gray-black, uniform and dense, the film is thin, and the film weight is 3.7g / m 2 ; Copper sulfat...

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Abstract

The invention relates to the technical field of aluminum alloy surface treatment, and relates to a phosphating solution and a phosphating method for aluminum alloy surface treatment. The phosphating solution comprises the following components with the following concentrations: 17-23g / L of zinc dihydrogen phosphate, 45-60g / L of zinc nitrate, 2.5-3.5g / L of 85% phosphoric acid, 6-10g / L of nickel nitrate, 2.0-2.5g / L of sodium fluoride, 1.5-2.1g / L of sodium chlorate, 2.0-4.0g / L of sodium nitrite, 1.0-1.5g / L of guanidine nitrate, 2.5-3.5g / L of hydroxylamine sulphate, 1.0-1.5g / L of phytic acid and the balance deionized water. The phosphating method comprises the following steps: (1) carrying out pretreatment on aluminum alloy sheets; (2) placing the pretreated aluminum alloy sheets in the phosphating solution and phosphating for 10-20min at 40-50 DEG C; and (3) washing the phosphated aluminum alloy sheets by virtue of the deionized water and blow-drying the aluminum alloy sheets by virtue ofhot air. The phosphating solution and the phosphating method for aluminum alloy surface treatment are simple in process, convenient to operate, and low in treatment cost; phosphating is carried out ata low temperature, so that energy is saved; chromium is not used in the phosphating solution, so that the problem of poison of chromium to environment and human body is avoided; few sediments duringworking are achieved; and a film formed through phosphating is uniform and compact, and a film layer is high in adhesion with an aluminum alloy matrix, and high in corrosion resistance.

Description

technical field [0001] The invention relates to the field of aluminum alloy surface treatment, and specifically relates to a zinc-based phosphating solution and a phosphating method for aluminum alloy surface treatment. Background technique [0002] Aluminum alloys are widely used in the machinery industry, home appliances and transportation industries. Due to its high activity, it is easy to form a thin and porous oxide film in the air, which reduces its mechanical strength and deteriorates its corrosion resistance. In order to improve its corrosion resistance, electrochemical or chemical methods are often used to form a protective conversion film on the surface to enhance the corrosion resistance of the substrate and prolong the service life. Chemical methods have more advantages in cost and efficiency, so they are widely used in aluminum alloy surface treatment. Conversion coatings produced by chemical methods include chromate film, phosphate film, phosphate-chromate fi...

Claims

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Application Information

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IPC IPC(8): C23C22/36C23C22/73C23C22/78
CPCC23C22/362C23C22/73C23C22/78
Inventor 胡秀英胡贵芳李明红马迪
Owner JIANGSU UNIV OF TECH
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