Pre-treating agent for surfaces of aluminum profile and aluminum alloy profile
A technology of aluminum alloy surface and pretreatment agent, which is applied in the direction of metal material coating process, etc., can solve the problems such as unsatisfactory effect of pretreatment agent, and achieve the effects of stable properties, avoiding environmental pollution, and good anti-corrosion performance
Active Publication Date: 2013-06-05
武汉风帆电化科技股份有限公司
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the defects of unsatisfactory effect of the existing trivalent chromium pretreatment agent for aluminum substrates, and provide a safe, reliable, high corrosion resistance and excellent adhesion pretreatment agent for aluminum and aluminum alloy surfaces
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Embodiment 1
[0017] Dissolve 38g of potassium chromium sulfate, 3g of potassium hexafluorozirconate, 1.6g of sodium salicylate, 10g of hydroxypropyl cellulose, and 6g of sorbitan monopalmitate in 41.4g of water to obtain pretreatment for aluminum and aluminum alloy surfaces Agent 1.
Embodiment 2
[0019] Dissolve 40g of potassium chromium sulfate, 2.5g of potassium hexafluorozirconate, 1.2g of sodium salicylate, 9g of methylcellulose, and 5.5g of sodium lauryl sulfate in 41.8g of water to obtain a pretreatment agent for aluminum and aluminum alloy surfaces 2.
Embodiment 3
[0021] Dissolve 35g of potassium chromium sulfate, 2.0g of potassium hexafluorozirconate, 1.8g of sodium salicylate, 8g of ethyl cellulose, 1g of hydroxyethyl cellulose, and 7g of methyleneoxyethanol in 45.2g of water to obtain aluminum and aluminum alloys Surface pretreatment agent 3.
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The invention discloses a pre-treating agent for surfaces of an aluminum profile and an aluminum alloy profile. The pre-treating agent comprises the following constituents by mass: 35-45 percent of water-solubility chromic salt, 0.1-3 percent of alkali metal zirconate, 0.1-2 percent of sodium salicylate, 5-10 percent of water-solubility coalescing agents, and 5-10 percent of wetting agents with the balance being water. The pre-treating agent for the surfaces of the aluminum profile and the aluminum alloy profile does not contain hexavalent chromium, and therefore environmental pollution is avoided, the pre-treating agent is stable in property and long in using period, a layer of transparent or light colored corrosion-resisting conversion coating can be formed on the surface of an aluminum profile workpiece, and a treated aluminum profile still maintains original metal characteristics. The conversion coating has extremely good corrosion-resistant performance and is firm in bonding, and the bonding force between the workpiece and the conversion coating and between the workpiece and paint can be notably increased. Besides, the using temperature range of the pre-treating agent is from the room temperature to 100 DEG C, the pre-treating agent can turn into a membrane quickly at the room temperature, and the effect is optimal when the pre-treating agent is heated to 20-50 DEG C.
Description
technical field [0001] The invention relates to the technical field of aluminum metal surface pretreatment, in particular to a pretreatment agent for aluminum and aluminum alloy surfaces. Background technique [0002] After the aluminum surface is degreased and washed with water, pretreatment can improve the corrosion resistance, wear resistance and bonding force of the aluminum surface with subsequent coatings. [0003] The traditional aluminum surface protection treatment is mainly hexavalent chromate passivation solution, which can react with the metal surface and form a chromium-containing passivation film. This passivation film protects the metal from various types of corrosion. Although the passivation layer can improve the corrosion resistance and pretreatment performance before gluing, the hexavalent chromate is highly toxic, pollutes the environment and is easy to cause cancer. With the enhancement of environmental awareness, environmental laws and occupational sa...
Claims
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IPC IPC(8): C23C22/34
Inventor 王池张红利王婷李杨郭辉
Owner 武汉风帆电化科技股份有限公司
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