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Aluminum alloy die pressed casting passivation solution, preparation method and passivation treatment method

A technology for die castings and aluminum alloys, which is used in the field of preparation and corrosion resistance of aluminum alloy die castings, and can solve the problems of poor corrosion resistance and inability to meet industrialization requirements, achieve strong corrosion resistance and improve passivation quality. , the effect of good conductivity

Inactive Publication Date: 2018-01-30
深圳市鸿美特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Corrosion resistance is still poor and cannot meet the requirements of industrialization

Method used

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  • Aluminum alloy die pressed casting passivation solution, preparation method and passivation treatment method
  • Aluminum alloy die pressed casting passivation solution, preparation method and passivation treatment method

Examples

Experimental program
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Embodiment 1

[0037] The corrosion-resistant natural color passivation solution for aluminum alloy die-casting provided in this embodiment includes the following components in terms of mass percentage, trivalent chromium salt, which can be anhydrous chromium sulfate, hexahydrate chromium sulfate, dodeca One or more of hydrated chromium sulfate, octadecahydrate chromium sulfate, anhydrous chromium chloride, hexahydrate chromium chloride, anhydrous chromium acetate, dihydrate chromium acetate, such as Cr 2 (SO 4 ) 3 ·6H 2 O is 5%, a zirconium salt compound, which can be one or more of potassium fluorozirconate, sodium fluorozirconate, ammonium fluorozirconate, anhydrous zirconium oxychloride, and zirconium oxychloride octahydrate, such as K 2 ZrF 6is 3%, the mixing accelerator is 0.5%, the polyethylene glycol is 0.01%, and the balance is water, wherein the mixing accelerator is cobalt nitrate hexahydrate, sodium fluoride and sodium nitrate in a mass ratio of 1:1:10 mixture.

[0038] The ...

Embodiment 2

[0050] The corrosion-resistant natural color passivation solution for aluminum alloy die-casting provided by this embodiment includes the following components (by mass percentage): trivalent chromium salt, which can be anhydrous chromium sulfate, hexahydrate chromium sulfate, dodeca One or more of hydrated chromium sulfate, octadecahydrate chromium sulfate, anhydrous chromium chloride, hexahydrate chromium chloride, anhydrous chromium acetate, dihydrate chromium acetate, such as Cr 2 (SO 4 ) 3 ·6H 2 O is 7%, a zirconium salt compound, which can be one or more of potassium fluorozirconate, sodium fluorozirconate, ammonium fluorozirconate, anhydrous zirconium oxychloride, and zirconium oxychloride octahydrate, such as K 2 ZrF 6 It is 5%, the mixed additive is 1.5%, the polyethylene glycol is 0.03%, and the balance is water. Wherein, the mixing accelerator is a mixture of cobalt nitrate hexahydrate, sodium fluoride and sodium nitrate in a mass ratio of 1:1:10.

[0051] The p...

Embodiment 3

[0055] A corrosion-resistant natural color passivation solution for aluminum alloy die-casting provided in this embodiment includes the following components (by mass percentage): Cr 2 (SO 4 ) 3 ·6H 2 O is 5%, K 2 ZrF 6 It is 3%, the mixed additive is 1.0%, the polyethylene glycol is 0.02%, and the balance is water. Wherein, the mixing accelerator is a mixture of cobalt nitrate hexahydrate, sodium fluoride and sodium nitrate in a mass ratio of 1:1:10.

[0056] The preparation process method of the corrosion-resistant natural color passivation solution for aluminum alloy die-casting provided in this embodiment, under normal temperature and pressure, Cr 2 (SO 4 ) 3 ·6H 2 Dissolve O in an appropriate amount of water, add K while stirring 2 ZrF 6 and mixed accelerator, continue to stir to make it completely dissolved; then add polyethylene glycol, stir evenly; finally add the remaining water, that is.

[0057] The above prepared solution is prepared into a 10% working so...

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Abstract

The invention provides a corrosion resistant natural color passivation solution for an aluminum alloy die pressed casting. The passivation solution is prepared from the following components in percentage by mass: 1 to 10 percent of trivalent chromium salt, 1 to 8 percent of zirconium salt compound, 0.1 to 5 percent of mixed accelerant, 0.01 to 0.05 percent of surfactant and the balance of water, wherein the mixed accelerant is a mixture of cobalt salt, sodium fluoride and sodium nitrate with a mass ratio of (0.5 to 2) to (0.5 to 2) to (5 to 15). The invention also provides a preparation methodof the passivation solution and a method for performing corrosion resistant natural color passivation treatment on the surface of the aluminum alloy die pressed casting. A film obtained by the methodhas natural color, is uniform and dense, has strong corrosion resistance and good conductivity and does not affect natural color metal texture of die-cast aluminum.

Description

technical field [0001] The invention belongs to the technical field of material surface treatment and metal protection, and particularly relates to a corrosion-resistant natural color passivation solution for aluminum alloy die castings, a preparation method, and a passivation method. technical background [0002] In the fields of communications, automobiles, hardware, etc., due to the increasingly high requirements for the appearance and corrosion resistance of die-casting aluminum products, the natural color passivation of aluminum alloy die-casting parts has become more and more in the field of pre-spraying treatment and surface anti-corrosion treatment. Wide range of applications. Traditional hexavalent chromium passivation can form a dense passivation film that is resistant to corrosion, but because hexavalent chromium is a carcinogen, it has been banned by various environmental protection regulations around the world. Therefore, in recent years, non-hexavalent chromium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
Inventor 刘彦明
Owner 深圳市鸿美特科技有限公司
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