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Surface treatment method of die casting aluminum alloy piece and die casting aluminum alloy product

A technology of casting aluminum alloy and surface treatment, which is applied in the field of die-casting aluminum alloy products and surface treatment of die-casting aluminum alloy parts, can solve problems such as affecting the electroplating process and poor adhesion of die-casting aluminum alloy parts, so as to enhance the surface adhesion and improve the Effect of coating quality and corrosion resistance, strong corrosion resistance

Active Publication Date: 2015-11-18
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the surface treatment methods of die-casting aluminum alloy parts that have been disclosed are: grinding, degreasing treatment, alkali corrosion, primary zinc precipitation, zinc stripping, secondary zinc precipitation, electroless nickel plating, etc., among which, primary zinc precipitation and secondary precipitation Zinc is placed in a zincate solution with a concentration of 100g / L for a certain period of time. The die-casting aluminum alloy parts treated with the above-mentioned zinc-precipitating solution have poor adhesion, which affects the subsequent electroplating process.

Method used

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  • Surface treatment method of die casting aluminum alloy piece and die casting aluminum alloy product

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Embodiment 1

[0040] This preferred embodiment discloses a method for surface treatment of a die-cast aluminum alloy part. Use this method to treat the surface of the die-casting aluminum alloy parts to be treated after activation and before electroplating, such as figure 1 As shown, the surface treatment method at least includes the following steps:

[0041] Step 1. The die-cast aluminum alloy parts to be treated are subjected to a zinc-precipitation treatment at room temperature using a zinc-precipitation solution for 30 seconds, wherein the components of the zinc-precipitation solution are preferably:

[0042] ZnO: 100g / L;

[0043] NaOH: 400g / L;

[0044] Sodium potassium tartrate: 10g / L;

[0045] FeCl 3 : 3g / L; the balance is water;

[0046] The one-time zinc precipitation in step 1 can remove the oxide film on the surface of the die-casting aluminum alloy to be treated, prevent the oxide film from forming again before electroplating, and dissolve the exposed surface layer.

[0047...

Embodiment 2

[0059] The surface treatment method described in this example is basically the same as that in Example 1, and the main difference is that the components of the solution used in the zinc-precipitation treatment and the zinc-removing process are different from those in Example 1.

[0060] In the present embodiment, the treatment time of a zinc-precipitation treatment is 30 seconds, and each component of the zinc-precipitation solution is preferably:

[0061] ZnO: 60g / L;

[0062] NaOH: 300g / L;

[0063] Sodium potassium tartrate: 2g / L;

[0064] FeCl 3 : 0.2g / L; the balance is water;

[0065] Dezincification treatment, the treatment time is 30 seconds, wherein the dezincification solution includes at least the following components:

[0066] HNO 3 : 50ml / L; the balance is water;

[0067] The treatment time of the secondary zinc precipitation treatment is 30 seconds, and the preferred ranges of the components of the zinc precipitation solution are as follows:

[0068] ZnO: 60g...

Embodiment 3

[0073] The surface treatment method described in this example is basically the same as that in Example 1, the difference lies in that the components of the solution used in the zinc-precipitation treatment and the zinc stripping process are different from those in Example 1.

[0074] In the present embodiment, the treatment time of a zinc-precipitation treatment is 30 seconds, and each component of the zinc-precipitation solution is preferably:

[0075] ZnO: 150g / L;

[0076] NaOH: 600g / L;

[0077] Sodium potassium tartrate: 20g / L;

[0078] FeCl 3 : 5g / L; the balance is water;

[0079] Dezincification treatment, the treatment time is 30 seconds, the dezincification solution includes at least the following components:

[0080] HNO 3 : 100ml / L; the balance is water;

[0081] The treatment time of the secondary zinc precipitation treatment is 30 seconds, and the preferred ranges of the components of the zinc precipitation solution are as follows:

[0082] ZnO: 150g / L;

[0...

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Abstract

The invention belongs to the field of surface treatment technologies, and discloses a surface treatment method of a die casting aluminum alloy piece and a die casting aluminum alloy product in order to solve the problem that a adhesive force of the conventional die casting aluminum alloy product is not good after surface treatment. The surface treatment method of the die casting aluminum alloy piece is characterized in that a to-be-treated die casting aluminum alloy piece is subjected to at least one time of zinc deposition after activated and before plated; a zinc deposition solution at least comprises the following ingredients: ZnO, NaOH, sodium potassium tartrate tetrahydrate and FeCl3. The die casting aluminum alloy product adopts the surface treatment method. The surface treatment method of the die casting aluminum alloy piece can improve the surface adhesive force of the to-be-treated die casting aluminum alloy piece, and the quality and the corrosion resistance of a plating layer, and can lay a good foundation for a subsequent chemical nickel plating process. The die casting aluminum alloy product has very high corrosion resistance.

Description

technical field [0001] The invention relates to the field of surface treatment technology, in particular to a surface treatment method of a die-casting aluminum alloy part and a die-casting aluminum alloy product treated by the method. Background technique [0002] In order to enhance the adhesion and corrosion resistance of die-casting aluminum alloy parts containing PPS plastics before the electroplating process, at least one zinc-precipitation treatment is usually required, so as to lay a good foundation for the subsequent process. [0003] At present, the surface treatment methods of die-casting aluminum alloy parts that have been disclosed are: grinding, degreasing treatment, alkali etching, primary zinc precipitation, zinc stripping, secondary zinc precipitation, electroless nickel plating, etc., among which, primary zinc precipitation and secondary precipitation Zinc is placed in a zincate solution with a concentration of 100g / L for a certain period of time, and the d...

Claims

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Application Information

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IPC IPC(8): C25D5/44C23C18/52
Inventor 杨光明
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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