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Surface treatment method of aluminum alloy and treatment liquid

A technology of aluminum alloy surface and surface treatment, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve problems such as difficult maintenance of galvanizing process operation, reduce service life of chemical nickel plating solution, etc., and achieve improvement Anti-corrosion performance, uniform thickness effect

Inactive Publication Date: 2010-05-19
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional electroless nickel plating process on the surface of aluminum alloy generally adopts the secondary zinc dipping primer process to ensure the adhesion of the nickel plating layer, but the zinc dipping process is complicated to operate and difficult to maintain, and seriously reduces the service life of the electroless nickel plating solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The aluminum alloy is processed according to the specific steps of electroless Ni-P plating: chemical degreasing → water washing (optional) → alkali etching → water washing (optional) → pickling → water washing (optional) → electroless Ni-P plating.

[0026] (1) Chemical degreasing: soak the aluminum alloy parts to be treated in 10% NaOH solution, the soaking temperature is 50°C, and the soaking time is 0.25-1min;

[0027] (2) Water washing: wash the aluminum alloy after chemical degreasing treatment with 50°C hot water first, and then rinse it with cold water until no water drops hang on the surface of the aluminum alloy;

[0028] (3) Alkali washing: Place the washed aluminum alloy in a NaOH solution with a concentration of 50g / L for alkali etching to remove the natural oxide film on the surface of the aluminum alloy. The alkali etching temperature is 60°C until the aluminum alloy surface has severe When bubbles are generated, take out the aluminum alloy sample;

[00...

Embodiment 2

[0035] The aluminum alloy is processed according to the specific steps of electroless Ni-P plating: chemical degreasing → water washing → alkali etching → water washing → pickling → water washing → electroless Ni-P plating.

[0036] (1) Chemical degreasing: soak the aluminum alloy parts to be treated in 5% NaOH solution, the soaking temperature is 60°C, and the soaking time is 0.25-1min;

[0037] (2) Water washing: wash the aluminum alloy after chemical degreasing treatment with 50°C hot water first, and then rinse it with cold water until no water drops hang on the surface of the aluminum alloy;

[0038] (3) Alkali washing: Place the washed aluminum alloy in a NaOH solution with a concentration of 60g / L for alkali etching to remove the natural oxide film on the surface of the aluminum alloy. The alkali etching temperature is 50°C until the aluminum alloy surface has severe When bubbles are generated, take out the aluminum alloy sample;

[0039] (4) Washing: rinse the aluminu...

Embodiment 3

[0045] The aluminum alloy is processed according to the specific steps of electroless Ni-P plating: chemical degreasing → water washing → alkali etching → water washing → pickling → water washing → electroless Ni-P plating.

[0046] (1) Chemical degreasing: soak the aluminum alloy parts to be treated in 8% NaOH solution, the soaking temperature is 50°C, and the soaking time is 0.25-1min;

[0047] (2) Water washing: wash the aluminum alloy after chemical degreasing treatment with 50°C hot water first, and then rinse it with cold water until no water drops hang on the surface of the aluminum alloy;

[0048] (3) Alkali washing: Place the washed aluminum alloy in NaOH solution with a concentration of 58g / L for alkali etching to remove the natural oxide film on the surface of the aluminum alloy. The alkali etching temperature is 55°C until the aluminum alloy surface has severe When bubbles are generated, take out the aluminum alloy sample;

[0049] (4) Washing: rinse the aluminum ...

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PUM

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Abstract

The invention relates to a surface treatment method of aluminum alloy, which comprises the following steps of: pre-treating: removing oil stains on the aluminum alloy surface by adopting an alkali degreasing solution; alkali washing: purifying the aluminum alloy surface at 50-60 DEG C by adopting alkali wash to remove a natural oxide film on the aluminum alloy surface; acid pickling: treating the aluminum alloy surface at room temperature for 1-5 minutes by adopting a pickling solution to further remove residual spots left on the aluminum alloy surface after alkali washing; and chemically plating Ni-P: forming a Ni-P plating layer on the aluminum alloy surface by adopting a pre-prepared chemical plating Ni solution with pH value of 5-6.5 at 85-90 DEG C for 90-240 minutes. By adopting a chemical plating Ni-P layer process to form a uniform favorable plating layer with good acid resistance, alkali resistance and salt resistance outside an aluminum alloy shell, the invention avoids the phenomena of uneven thickness of a protective layer and spraying missing on a complex structure part, and remarkably improves the anticorrosion performance of the aluminum alloy.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a surface treatment method and a treatment liquid for aluminum alloys. Background technique [0002] For the aluminum alloy-based components used in daily life, the surface anti-corrosion treatment usually involves spraying plastic powder or applying anti-corrosion coatings on the outer surface of the components. The main disadvantage of this treatment method is that the thickness of the protective layer obtained by spraying plastic powder or applying anti-corrosion coating is not uniform, and it is difficult to spray on the parts with complex structures such as bends and corners of components, so it is often damaged in harsh environments. Cracks, cracks, or even large pieces fall off, causing the aluminum alloy substrate to corrode; especially when the aluminum alloy substrate is used for the casing of electrical devices, it is not allowed to use paint to protect the explosion-p...

Claims

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Application Information

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IPC IPC(8): C23C18/36C23C18/18
Inventor 周明杰许勇
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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