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
CN102965709AActive Publication Date: 2013-03-13BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2013-03-13

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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.
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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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