Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof

An aluminum alloy and passivation solution technology, which is applied in the field of passivation solution where the accelerator is chloride salt, can solve the problems affecting process stability and industrial application, and achieves rapid dissolution rate, simple operation and excellent corrosion resistance. Effect

Inactive Publication Date: 2011-11-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof
  • Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof
  • Aluminum alloy rare earth passivating liquid taking chlorine salt as accelerator and use method thereof

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Effect test

Embodiment 1

[0031] Embodiment 1: Rare earth conversion treatment on the surface of 6063 aluminum alloy profile (1.5mm)

[0032] The rare earth chemical conversion treatment method on the surface of aluminum alloy comprises the following steps:

[0033] (1) Pretreatment: (a) Cut 5×5cm from 6063 large-size aluminum alloy profiles (thickness 1.5mm) 25 pieces of samples were drilled, and polished with SiC water sandpaper until the surface roughness was 10 microns, and the surface dirt was cleaned with tap water and dried with a blower, and the holes were connected with thin wires; (b) the weak Put the caustic alkaline solution into an ultrasonic cleaning machine, put an aluminum alloy test piece, ultrasonically clean it for 8 minutes, and then clean it with deionized water; in terms of weight to volume ratio, the weak caustic alkaline solution is 8g / L anhydrous carbonic acid Sodium, 6g / L sodium silicate to prepare deionized aqueous solution; (c) immerse the test piece in the alkaline solut...

Embodiment 2

[0037] Embodiment 2: Rare earth conversion treatment on the surface of 6063 aluminum alloy profile (1.5mm)

[0038] The rare earth chemical conversion treatment method on the surface of aluminum alloy comprises the following steps:

[0039] (1) Pretreatment: (a) Cut 3×3cm from 6063 large-size aluminum alloy profiles (thickness 1.5mm) 2 5 pieces of samples were drilled, and polished with SiC water sandpaper to a surface roughness of 0.01 micron, and the surface dirt was cleaned with tap water and dried with a blower, and connected with thin wires at the punched places; (b) the weak Put the caustic alkaline solution into an ultrasonic cleaning machine, put an aluminum alloy test piece, ultrasonically clean it for 4 minutes, and then clean it with deionized water; by weight to volume ratio, the weak caustic alkaline solution is 10g / L anhydrous carbonic acid Sodium, 15g / L sodium silicate to prepare a deionized aqueous solution; (c) Put the test piece into the alkaline solution ...

Embodiment 3

[0043] Embodiment 3: Rare earth conversion treatment on the surface of 6063 aluminum alloy profile (1.5mm)

[0044] The rare earth chemical conversion treatment method on the surface of aluminum alloy comprises the following steps:

[0045] (1) Pretreatment: (a) Mechanically polish the surface of the aluminum alloy to control the surface roughness at 8 microns; (b) Put the weak corrosion alkaline solution into the ultrasonic cleaning machine, put the aluminum alloy test piece, Ultrasonic cleaning for 10 minutes, and then cleaning with deionized water; according to the weight to volume ratio, the weak corrosion alkaline solution is 8g / L anhydrous sodium carbonate and 5g / L sodium silicate to prepare a deionized aqueous solution; (c) Put the test piece into the alkaline solution and soak for 2 minutes, and then rinse it with deionized water; the concentration of each component in the alkaline solution is 8g / L sodium hydroxide, 6g / L anhydrous Sodium carbonate; (d) Immerse the t...

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Abstract

The invention discloses an aluminum alloy rare earth passivating liquid taking a chlorine salt as an accelerator. The aluminum alloy rare earth passivating liquid can simultaneously meet the requirements of fast film formation and maintain a treatment liquid to be stable for a long term. The rare earth passivating liquid consists of the following components: 5-25g/L of cerium salt, 1-5g/L of oxidant and 0.1-1.5g/L of film-forming accelerator. By addition of the accelerator, aluminum alloy can be filmed at room temperature within 4-15 minutes, and the service life of a rare earth conversion liquid can be maintained so that the rare earth conversion liquid is not precipitated for more than 30 days. According to the invention, an additive is non-toxic and environmentally-friendly, the corrosion resistance of the aluminum alloy subjected to film formation is good, operation is simple, and batch production is easily carried out.

Description

technical field [0001] The invention relates to a rare earth chemical passivation solution for the surface of an aluminum alloy, in particular to a passivation solution in which the accelerator is a chloride salt. The passivation solution of the invention can simultaneously satisfy rapid film formation and long-term stability of the treatment solution. Background technique [0002] Aluminum is one of the most widely distributed elements in the earth's crust, with an average content of 8.8%, second only to oxygen and silicon. It has low density, high strength, no allotropic transformation, good ductility and plasticity, and is the second most used metal material after steel. Aluminum alloy is a very active metal. Under ordinary atmospheric conditions, a layer of natural oxide film is easily formed on the surface of aluminum alloy. The oxide film can protect the aluminum alloy substrate from being further corroded in neutral and weakly acidic solutions, and plays a certain pr...

Claims

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Application Information

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IPC IPC(8): C23C22/56
Inventor 李文芳侯建明杜军穆松林
Owner SOUTH CHINA UNIV OF TECH
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