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Surface treatment method of aluminum alloy

An aluminum alloy surface and treatment method technology, applied in the field of metal surface treatment, can solve the problems such as the wear resistance of the aluminum alloy conversion coating layer is not greatly improved, the intergranular corrosion of aluminum and aluminum alloys, and the low surface hardness, etc. The effect of enhanced scratch resistance and salt spray corrosion resistance, uniform passivation, and dense hardness

Inactive Publication Date: 2017-06-13
当涂县宏宇金属炉料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used method now is the electrolytic passivation method, which forms a conversion film on the surface of the aluminum alloy by an electrochemical method. Although this method can improve the corrosion resistance of the aluminum alloy, the wear resistance of the aluminum alloy conversion film layer has not been greatly improved. ; and this layer of oxide film is susceptible to strong acid and alkali corrosion, while aluminum and aluminum alloys are prone to intergranular corrosion, the surface hardness is low, and they are not wear-resistant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of aluminum alloy surface treatment method, comprises the following steps:

[0023] (1) Water washing: Soak the aluminum alloy substrate in clean water for 30 minutes, and then use ultrasonic treatment for 2 minutes;

[0024] (2) Degreasing treatment: the aluminum alloy substrate is put into a degreasing solution for degreasing treatment, wherein the degreasing solution is made of the following components in parts by weight: sodium carbonate 1.2, sodium hydroxide 2.5, sodium sulfanil 0.6, pentaerythritol 4. Sodium tartrate 0.2, Verbena alcohol extract 0.05, water 80;

[0025] (3) Water washing: Spray and wash the degreased aluminum alloy base material twice with 75°C water;

[0026] (4) Pickling: Soak the aluminum alloy base material treated in step 3 in acid solution for 6 minutes, and the acid solution used is made of the following components by weight percentage: sulfuric acid 2.5, stearic acid 0.8, butanediol Acid 1.2, water 100;

[0027] (5) Water washing...

Embodiment 2

[0035] A kind of aluminum alloy surface treatment method, comprises the following steps:

[0036] (1) Water washing: Soak the aluminum alloy substrate in clean water for 30 minutes, and then use ultrasonic treatment for 4 minutes;

[0037] (2) Degreasing treatment: the aluminum alloy substrate is put into a degreasing solution for degreasing treatment, wherein the degreasing solution is made of the following components in parts by weight: sodium carbonate 1.2, sodium hydroxide 2.5, sodium sulfanil 0.6, pentaerythritol 4. Sodium tartrate 0.2, Verbena alcohol extract 0.05, water 80;

[0038] (3) Water washing: Spray and wash the degreased aluminum alloy substrate twice with 80°C water;

[0039] (4) Pickling: Soak the aluminum alloy base material treated in step 3 in acid solution for 6-8 minutes, and the acid solution used is made of the following components by weight percentage: sulfuric acid 2.5, stearic acid 0.8, Succinic acid 1.2, water 100;

[0040] (5) Water washing: wa...

Embodiment 3

[0048] A kind of aluminum alloy surface treatment method, comprises the following steps:

[0049] (1) Water washing: Soak the aluminum alloy substrate in clean water for 30 minutes, and then use ultrasonic treatment for 3 minutes;

[0050] (2) Degreasing treatment: the aluminum alloy substrate is put into a degreasing solution for degreasing treatment, wherein the degreasing solution is made of the following components in parts by weight: sodium carbonate 1.2, sodium hydroxide 2.5, sodium sulfanil 0.6, pentaerythritol 4. Sodium tartrate 0.2, Verbena alcohol extract 0.05, water 80;

[0051] (3) Water washing: Spray and wash the degreased aluminum alloy base material twice with 78°C water;

[0052](4) Pickling: Soak the aluminum alloy base material treated in step 3 in an acid solution for 7 minutes, and the acid solution used is made of the following components by weight percentage: 2.5 sulfuric acid, 0.8 stearic acid, dibutyl Acid 1.2, water 100;

[0053] (5) Water washing:...

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PUM

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Abstract

The invention belongs to the field of metal surface treatment, and particularly relates to a surface treatment method of an aluminum alloy. The surface treatment method comprises the steps of (1) water washing, (2) ungrease treatment, (3) water washing, (4) acid pickling, (5) water washing, (6) alkaline washing, (7) deionized water washing, (8) corona treatment, (9) electrolytic passivation, (10) water washing and (11) drying. A surface treatment process of the aluminum alloy is simple, passivation is achieved more uniformly, and a passivation layer is high in density; and the corrosion resisting capacity of the aluminum alloy can be greatly improved, and the surface can resist oil contamination.

Description

technical field [0001] The invention belongs to the field of metal surface treatment, in particular to an aluminum alloy surface treatment method. Background technique [0002] Aluminum alloy has a series of advantages such as low density, high specific strength, good corrosion resistance and formability, and low cost. Applications. [0003] There are many surface treatment methods for an aluminum alloy, among which physical methods, chemical methods, physicochemical methods and comprehensive methods are relatively mature and widely used. The commonly used method now is the electrolytic passivation method, which forms a conversion film on the surface of the aluminum alloy by an electrochemical method. Although this method can improve the corrosion resistance of the aluminum alloy, the wear resistance of the aluminum alloy conversion film layer has not been greatly improved. ; Moreover, this layer of oxide film is easily corroded by strong acid and strong alkali. At the sam...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/16C23G1/22C23G1/12
CPCC25D11/04C23G1/125C23G1/22C25D11/16
Inventor 芮德发
Owner 当涂县宏宇金属炉料有限责任公司