Aluminum alloy surface treatment method

Abstract

The invention provides an aluminum alloy surface treatment method. The aluminum alloy surface treatment method comprises the following steps that an aluminum alloy is subjected to alkali so that a first structure part can be formed on the surface of the aluminum alloy, wherein the first structure part comprises a plurality of first grooves which are uniformly distributed; water washing is carriedout on the aluminum alloy; and the aluminum alloy is subjected to acid etching to form a second structure part, wherein the second structure part comprises a plurality of second grooves uniformly distributed on the first structure part. According to the aluminum alloy surface treatment method, the treated aluminum alloy surface has a uniform and fine white atomized appearance; the chemical reagentused in the aluminum alloy surface treatment method is low in concentration, the corrosion amount of the aluminum alloy is smaller than 5%, and the size of the aluminum alloy is prevented from damage; and the use of fluorine-containing ion reagents is avoided, and the processing and production are safer.

Description

technical field [0001] The invention relates to the field of processing, in particular to an aluminum alloy surface treatment method. Background technique [0002] Many aluminum alloy workpieces need surface treatment before leaving the factory to improve the appearance of aluminum alloy workpieces. Among them, the effect of surface treatment has an important influence on the appearance and quality of aluminum alloy workpieces. In order to form a sandy surface on the aluminum alloy workpiece, the existing aluminum alloy surface pretreatment methods mainly include alkali etching and acid etching. The main disadvantage of alkali etching is that the amount of corrosion to aluminum alloy is large (the corrosion amount of metal by the general alkali etching method is 7%), which causes a waste of resources and increases the production cost. The main disadvantage of acid etching is that the use of ammonium bifluoride and other agents will release toxic hydrogen fluoride gas and d...

AI Technical Summary

Problems solved by technology

The main disadvantage of alkali etching is that the amount of corrosion to aluminum alloy is large (the corrosion amount of metal by the general alkali etching method is 7%), which causes a waste of resources and increases production costs

The main disadvantage of acid etching is that the use of ammonium bifluoride and other agents will release toxic hydrogen fluoride gas and discharge fluorine-containing and ammonia-containing wastewater to pollute the environment

And regardless of alkali etching or acid etching, due to the poor compatibility of the chemicals used, a large amount of water washing is required after each step

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