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Environmental long-term pre-treatment process for surface anodization of aluminum alloy

An aluminum alloy surface and anodic oxidation technology, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of large environmental pollution of light-emitting liquid, affecting the health of operators, corrosion of aluminum substrate, etc., and achieves small damage to the substrate , the reaction is uniform and moderate, and the effect of reducing the loss of aluminum materials

Active Publication Date: 2013-03-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages that the use of alkaline etching solution existing in the anodic oxidation pre-treatment of the aluminum alloy surface seriously corrodes the aluminum substrate, the cycle is short, and aluminum scale is easily produced; the light-emitting solution pollutes the environment greatly and affects the health of operators, and provides a A new process method for anodic oxidation pretreatment of aluminum alloy surface

Method used

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  • Environmental long-term pre-treatment process for surface anodization of aluminum alloy
  • Environmental long-term pre-treatment process for surface anodization of aluminum alloy
  • Environmental long-term pre-treatment process for surface anodization of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] An environmentally friendly pretreatment process for anodizing the surface of aluminum alloys, including the following steps:

[0026] (1) Alkali etching

[0027] The composition of bath solution is: NaOH50g L -1 , alkali etching agent 70g L -1 , the balance of water; working temperature: 50 ℃, working time 2 minutes.

[0028] Alkaline etching agents include: Na 3 PO 4 20gL -1 , Na 2 CO 3 10gL -1 , sodium gluconate 10g L -1 , sodium benzoate 1gL -1 , sodium dodecylsulfonate 0.1g L -1 , the balance of water.

[0029] (2) hot water wash

[0030] Working temperature: 50°C.

[0031] (3) Wash in cold water

[0032] Working temperature: 20°C.

[0033] (4) light

[0034] The composition of the bath solution is: H 2 SO 4 100gL -1 , sodium molybdate 60g L -1 , the balance of water. Working temperature: 25°C, working time 3 minutes.

[0035] (5) Wash in cold water

[0036] Working temperature: 25°C.

Embodiment 2

[0038] An environmentally friendly pretreatment process for anodizing the surface of aluminum alloys, including the following steps:

[0039] (1) Alkali etching

[0040] The composition of bath liquid is: NaOH75g L -1 , alkali etching agent 80g L -1 , the balance of water; working temperature: 30 ℃, working time 2 minutes.

[0041] Alkaline etching agents include: Na 3 PO 4 25gL -1 , Na 2 CO 3 15gL -1 , sodium gluconate 15g L -1 , sodium benzoate 2g L -1 , sodium dodecylsulfonate 0.3g L -1 , the balance of water.

[0042] (2) hot water wash

[0043] Working temperature: 50°C.

[0044] (3) Wash in cold water

[0045] Working temperature: 20°C.

[0046] (4) light

[0047] The composition of the bath solution is: H 2 SO 4 85gL -1 , sodium molybdate 50g L -1 , the balance of water. Working temperature: 20°C, working time 3 minutes.

[0048] (5) Wash in cold water

[0049] Working temperature: 20°C.

Embodiment 3

[0051] An environmentally friendly pretreatment process for anodizing the surface of aluminum alloys, including the following steps:

[0052] (1) Alkali etching

[0053] The composition of bath solution is: NaOH100g L -1 , alkaline etchant 90g L -1 , the balance of water; working temperature: 10 ℃, working time 3 minutes.

[0054] Alkaline etching agents include: Na 3 PO 4 30gL -1 , Na 2 CO 3 20gL -1 , sodium gluconate 20g L -1 , sodium benzoate 2g L -1 , sodium dodecyl sulfate 0.5g L -1 , the balance of water.

[0055] (2) hot water wash

[0056] Working temperature: 50°C.

[0057](3) Wash in cold water

[0058] Working temperature: 20°C.

[0059] (4) light

[0060] The composition of the bath solution is: H 2 SO 4 70gL -1 , sodium molybdate 40g L -1 , the balance of water. Working temperature: 30°C, working time 3 minutes.

[0061] (5) Wash in cold water

[0062] Working temperature: 20°C.

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Abstract

The invention discloses an environmental long-term pre-treatment process for surface anodization of aluminum alloy. A pre-treatment solution comprises two parts: an alkali etching solution and a brightening liquid, wherein the alkali etching solution is composed of sodium hydroxide and an alkaline etching agent consisting of sodium phosphate, sodium carbonate, D-sodium gluconate, sodium benzoate and sodium dodecanesulphonate; and the brightening liquid is composed of sulfuric acid and sodium molybdate. The technology comprises the following steps: 1, etching by alkali; 2, washing by hot water; 3, washing by cold water; 4, brightening; and 5, washing by the cold water. The alkali etching solution provided by the invention has long using period, is stabile in performance and not easy to produce insoluble aluminum fouling; the brightening liquid does not contain fluorinion and hexavalent chromium, does not emit toxic gases, is green and safe, and meets environmental requirements. The aluminium processed by the pre-treatment method can be directly anodized.

Description

technical field [0001] The invention relates to an environment-friendly and long-acting pretreatment process for anodizing the surface of an aluminum alloy, more particularly, a long-acting alkali etching bath and an environment-friendly light emitting bath. Background technique [0002] The pre-treatment of traditional aluminum alloy anodizing process mostly adopts ordinary alkali etching and three-acid light extraction to remove oil stains and natural oxide film on the surface of aluminum, and to obtain a bright active surface, so as to prepare for anodic oxidation. However, ordinary Alkali corrosion seriously corrodes the substrate, the reaction is very violent, and the service life of the bath is short. At the same time, it is easy to form a hard white aluminum scale deposit and adhere to the bottom of the alkali washing tank. It is necessary to stop production and clean the tank regularly, resulting in the waste of alkali solution and the reduction of production efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16
Inventor 李松梅李英东刘建华于美刘英智李志勇杨茗佳王永平
Owner BEIHANG UNIV
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