Chromium-free treating liquid for preparing erosion-resisting oxide film on aluminum alloy surface, treating and using method thereof

A technology of aluminum alloy surface and corrosion resistance, applied in the direction of metal material coating process, etc., can solve the problem of low film forming efficiency, and achieve the effect of low temperature energy consumption, good adhesion and golden color

Active Publication Date: 2007-10-17
GUANGYA ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to replace the toxic chromate treatment solution and solve the problem of low film-forming efficiency of the current chromium-substituting treatment solution, the present invention provides a low-temperature, high-efficiency, rapid-formation method capable of preparing an excellent corrosion-resistant oxide film on the surface of an aluminum alloy. Chrome-free surface treatment fluid with film characteristics

Method used

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  • Chromium-free treating liquid for preparing erosion-resisting oxide film on aluminum alloy surface, treating and using method thereof
  • Chromium-free treating liquid for preparing erosion-resisting oxide film on aluminum alloy surface, treating and using method thereof
  • Chromium-free treating liquid for preparing erosion-resisting oxide film on aluminum alloy surface, treating and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The method for preparing an oxide film on the surface of a 2024 aluminum alloy with the treatment solution of the present invention has the following steps;

[0043] a. Grind the surface of 2024 aluminum alloy until the surface is smooth and flat, with a roughness of 0.01-10 μm, and then rinse with deionized water to avoid over-corrosion;

[0044] b. Dip the aluminum alloy treated in step a into 50g·L -1 Sodium phosphate dodecahydrate, 10g·L -1 Sodium silicate, 2mL / L emulsifier OP composed of 50 ℃ degreasing treatment, carry out 4min degreasing treatment, after the reaction is completed, rinse with deionized water;

[0045] c. Dip the aluminum alloy treated in step b into 8g·L -1 Sodium hydroxide, 10g·L -1 Sodium phosphate dodecahydrate, 8g·L -1 In the 50°C alkali purification solution composed of sodium carbonate, perform alkali purification treatment for 2 minutes, and rinse with deionized water after the reaction is completed;

[0046] d. Immerse the aluminum al...

Embodiment 2

[0050] After the same pretreatment as in Example 1, the 5052 aluminum alloy was placed in a chemical composite treatment solution for treatment. Composite treatment liquid composition is cobalt salt 10g L -1 , potassium permanganate 3g·L -1 , sodium nitrate 4g·L -1 , a mixture of sodium chloride and sodium fluoride 2g·L -1 , sodium acetate 50g·L -1 , sodium dodecylbenzenesulfonate 1g·L -1 , adjust the pH to 8, the temperature to room temperature, and the reaction time to 15 minutes; after the reaction is completed, rinse with deionized water, dry naturally, and store in a dry place. The surface of the treated 5052 aluminum alloy forms a layer of golden yellow conversion film with good corrosion resistance, which passed the 168-hour neutral salt spray test (ASTM B117), and the corrosion resistance reached level 8.

Embodiment 3

[0052] After the 6063 aluminum alloy is pretreated with the implementation method 1, it is placed in the chemical composite treatment solution for treatment. Composite treatment liquid composition is cobalt salt 5g L -1 , potassium permanganate 3g·L -1 , sodium nitrate 4g·L -1 , ammonium fluoride and sodium fluoride mixture 1g L -1 , sodium acetate 40g·L -1 , OP and sodium dodecylbenzenesulfonate mixture 0.8g L -1 ; Adjust the pH to 7, the temperature to 50° C., and the reaction time to 3 minutes. After the reaction is completed, rinse with deionized water, dry naturally, and store in a dry place. The surface of the 6063 aluminum alloy treated above forms a layer of golden yellow conversion film with good corrosion resistance, and the corrosion resistance reaches grade 8 after passing the 168-hour neutral salt spray test (ASTM B117).

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Abstract

The present invention discloses a chromium-free treatment liquid for preparing corrosion resistant oxidation film at aluminium alloy surface as well as the processing and use method thereof, characterized in that said treatment fluid utilizes a cobalt (III) salt as a main salt and a hypermanganate and a nitrate as a composite oxidizing compound to prepare a composite Co-Mn oxidation film having favorable corrosion resistance performances at aluminium alloy surface. The formula for said treatment liquid is that each litre solution contains cobalt salt of 5 g / L(-1)-20 g / L(-1), kalii permangana of 1 g / L(-1)-4 g / L(-1), sodium nitrate of 1 g / L(-1)-4 g / L(-1), promotor (chlorides and fluorides) of 1 g / L(-1)-4 g / L(-1), sodium acetate of 20 g / L(-1)-50 g / L(-1) and wetting agents (sodium dodecylbenzene sulfonate, OP-10) of 0.5 g / L(-1)-1 g / L(-1). Saic processing and use method comprises (1)sanding the aluminium alloy until its surface is smooth and even; (2) pretreating the aluminium alloy surface; (3) performing a conversion processing by using the treatment fluid; (4) cleaning-up using water and atmospheric-drying naturally. Said treatment fluid in accordance with the present invention possesses the advantages of environmental protection due to its hexavalent chromium-free, fast film-forming speed, simple process, uniform rete, strong corrosion resistance, few environment pollution, and the like.

Description

technical field [0001] The invention relates to an aluminum alloy surface treatment method, in particular to a chromium-free chemical oxidation based on a Co-Mn composite oxide with good corrosion resistance prepared on the surface of an aluminum alloy by using an environmentally friendly chemical conversion treatment solution that does not contain hexavalent chromium membrane. Background technique [0002] Aluminum alloy is widely used for its low density, high specific strength, easy processing and forming, castable, strengthenable, strong thermal and electrical conductivity, no low-temperature brittleness, non-magnetic, strong light and heat reflection, and nuclear radiation resistance. Automobiles, aerospace, architectural decoration, home appliances, instruments, computers, mobile phones, daily hardware and many other fields have become the second largest metal structural materials after steel. Due to the high chemical activity of aluminum and its alloys, the oxide fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/05
Inventor 陈东初潘炜盛
Owner GUANGYA ALUMINUM
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