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Anode oxidation pretreatment method for aluminium alloy

An anodizing, aluminum alloy technology, applied in the direction of electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of darkening of the corroded surface, pollution of the electrophoresis tank, etc. The effect of low aluminum consumption

Inactive Publication Date: 2005-08-17
熊映明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is developed to solve the problem of darkening the surface of aluminum alloys due to acid corrosion; bright acid etching is a cutting-edge technology for surface treatment of aluminum materials. The acid-etched material is brightly treated, which not only retains the advantages of strong ability to remove mechanical lines, fast sanding, and low aluminum consumption, but also can completely remove the acid-etched ash, and solve the problem of darkening the surface of the acid-etched material and coloring grooves, The disadvantage of the electrophoresis tank being polluted is a rare technological breakthrough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The pre-treatment method of anodic oxidation of aluminum alloy includes the following methods and substances:

[0036] (1) Degreasing and dewaxing;

[0037] The composition of the bath liquid is: the degreasing and dewaxing agent is 140g / l, the working temperature is 10°C, and the working time is 3 minutes; the degreasing and dewaxing agent is composed of the following substances:

[0038] h 2 SO 4 43g / l,H 3 PO 4 35g / l, HNO 3 30g / l, behenyl alcohol 10g / l, acetic acid 7g / l, NH 4 HF 2 19g / l, Tx-10 0.1g / l, balance water;

[0039] (2) washing with water;

[0040] (3) brightening acid etching;

[0041] The composition of the bath solution is: brightening acid etching agent 160g / l ammonium bifluoride 60g / l, pH=3.5, working temperature is 30°C, treatment time is 10 minutes; acid etching additive is composed of the following substances:

[0042] (NH 4 )H 2 PO 4 13g / l, behenyl alcohol 9g / l, NH 4 BF 4 28g / l, tartaric acid 28g / l, balance water;

[0043]...

Embodiment 2

[0053] The pretreatment method of aluminum alloy comprises the following steps:

[0054] (1) Degreasing and dewaxing;

[0055] The composition of the bath solution is: the degreasing and dewaxing agent is 150g / l, the working temperature is 25°C, and the working time is 2 minutes; the degreasing and dewaxing agent is composed of the following substances:

[0056] h 2 SO 4 38g / l,H 3 PO 4 31g / l, HNO 3 35g / l, behenyl alcohol 8g / l, acetic acid 6g / l, NH 4 HF 2 16g / lTx-10 0.3g / l, balance water;

[0057] (2) washing with water;

[0058] (3) brightening acid etching;

[0059] The composition of the bath solution is: brightening acid etching agent 180g / l ammonium bifluoride 70g / l, pH=3.3, working temperature is 35°C, treatment time is 9 minutes; acid etching additive is composed of the following substances:

[0060] (NH 4 )H 2 PO 4 12g / l, behenyl alcohol 8g / l, NH 4 BF 4 23g / l, tartaric acid 22g / l, balance water;

[0061] (4) acid etching bright;

[0062] The c...

Embodiment 3

[0071] The pretreatment method of aluminum alloy comprises the following steps:

[0072] (1) Degreasing and dewaxing;

[0073] The composition of the bath liquid is: the degreasing and dewaxing agent is 160g / l, the working temperature is 40°C, and the working time is 2 minutes; the degreasing and dewaxing agent is composed of the following substances:

[0074] h 2 SO 4 32g / l,H 3 PO 4 21g / l, HNO 3 25g / l, behenyl alcohol 7g / l, acetic acid 6g / l, NH 4 HF 2 11g / l, Tx-10 0.3g / l, balance water;

[0075] (2) washing with water;

[0076] (3) brightening acid etching;

[0077] The composition of the bath solution is: brightening acid etching agent 200g / l ammonium bifluoride 80g / l, pH=3.0, working temperature is 40°C, treatment time is 7 minutes; acid etching additive is composed of the following substances:

[0078] (NH 4 )H 2 PO 4 9g / l, behenyl alcohol 8g / l, NH 4 BF 4 15g / l, tartaric acid 20g / l, balance water;

[0079] (4) acid etching bright;

[0080] The ...

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PUM

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Abstract

The processing method of aluminum alloy part before anode oxidizing includes the following steps: eliminating oil and wax, water washing, brightening acid pickling, low temperature polishing, water washing, eliminating ash, and water washing. The said method has the advantages of powerful mechanical ripple eliminating ability, low aluminum loss, complete elimination of acid pickling ash, etc. and can make the processed surface have no ripple, ash and fine sand and be bright.

Description

technical field [0001] The invention relates to a pretreatment method for anodic oxidation of aluminum alloy. Background technique [0002] Acid corrosion of aluminum alloy has many advantages such as strong ability to remove mechanical lines, fast sanding, and low aluminum consumption. In less than a year in 2000, it quickly replaced alkali corrosion and became the mainstream production process of aluminum anodizing pretreatment. . However, since the method was popularized, the problem of the darkening of the aluminum surface has been puzzling the manufacturer and has also affected the product grade. In order to overcome the above defects, most manufacturers are equipped with alkali etching tanks and ash removal tanks. Even so, acid etching materials are still much darker than alkali etching materials, and the problem has not been fundamentally solved. In addition, the acid etching ash that darkens the surface of the profile is very stubborn. Even if it passes through the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16
Inventor 熊映明
Owner 熊映明
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