Ash removing agent for neutralization treatment of aluminum alloy and preparation method thereof

Abstract

The invention relates to an ash removing agent for neutralization treatment of aluminum alloy and a preparation method thereof. The ash removing agent is applied to the neutralization treatment afterthe pretreatment of the aluminum alloy and comprises the following components according to parts by weight: 50-200 parts of sulfuric acid, 2-100 parts of hexavalent iron salt, 5-50 parts of ferric iron salt, 10-50 parts of hydrogen peroxide and 5-50 parts of corrosion inhibitor. The ash removing agent for the neutralization treatment of the aluminum alloy is used for removing ash in the neutralization treatment process after the pretreatment of the aluminum alloy, has little corrosion to the aluminum alloy, does not affect the glossiness of an aluminum alloy substrate, has a good ash removal treatment effect and fast ash removal speed, and is low in cost and environmentally-friendly without dead angles and residues; the ash removing agent does not generate toxic and harmful gases in the ash removal process, is environmentally-friendly, has no threat to the health of operators, and solves the problems that as ash cannot be removed completely by a traditional process, the ash can only bewiped by a wet towel after the follow-up anodic oxidation sealing and is difficult to completely wipe. The preparation technology of the ash removing agent is simple, high-efficiency, energy-saving and environmentally-friendly.

Description

technical field [0001] The invention relates to the field of surface treatment of aluminum alloys, in particular to a deashing agent for neutralization treatment of aluminum alloys and a preparation method thereof. Background technique [0002] After the pre-treatment of aluminum alloy (degreasing, chemical polishing, alkali etching, acid etching, etc.), it is easy to produce the phenomenon of ash hanging; however, the ash hanging on the surface of the workpiece, due to the complex composition, the mechanism of production is also quite complicated. It has always been a very headache in the industry. [0003] The ash produced by the pre-treatment of aluminum alloys is generally directly related to the grade of aluminum material, the process of pre-treatment and the potion used. Generally, there are the following situations: 1. The grades of aluminum materials used are different, the process of pre-treatment and Different potions are used, and the components of salts and oxid...

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Problems solved by technology

[0002] After the pre-treatment of aluminum alloy (degreasing, chemical polishing, alkali etching, acid etching, etc.), it is easy to produce the phenomenon of ash hanging; however, the ash hanging on the surface of the workpiece, due to the complex composition, the mechanism of production is also quite complicated. It has always been a very headache problem in the industry

[0003] The ash produced by the pre-treatment of aluminum alloys is generally directly related to the grade of aluminum material, the process of pre-treatment and the potion used. Generally, there are the following situations: 1. The grades of aluminum materials used are different, the process of pre-treatment and Different potions are used, and the components of salts and oxides produced after participating in the reaction are different. That is, the composition and composition of the ash are related to the grade of aluminum material, the pretreatment process and the potion used. The existing ash removal methods are difficult to adapt to many The ash on the surface of the aluminum alloy is difficult to remove depending on the type of aluminum material, the pretreatment process, and the potion used; 2. The aluminum oxide produced by the aluminum component and acid or alkali generally has a certain viscosity, which is easy to adsorb on the surface of the workpiece, increasing the Difficulty of ash removal

[0004] The traditional dust removal method is generally wiped with a damp cloth, and it is difficult to clean the grooves, which consumes a lot of labor and time.

The existing ash removal process is mainly divided into sulfuric acid method and nitric acid method. The sulfuric acid method has the advantages of low cost and good economic benefits. The dissolution rate of the hanging ash and the elemental copper precipitated on the surface after chemical polishing is slow or even powerless, and the sulfuric acid method takes a long time to operate, and snowflake-like corrosion spots are prone to appear after ash removal; the nitric acid method is compared with the sulfuric acid method. , Nitric acid is an oxidizing acid with strong solubility to hanging ash, which can remove almost all kinds of hanging ash, so that the aluminum can obtain a clean, bright and uniform passivation surface, and avoid the generation of snowflake-like spots, but the nitric acid solution volatilizes The nitric acid vapor and its decomposition products not only pollute the air, deteriorate the operating environment of the workshop, but also corrode the workshop and mechanical equipment, causing potential safety hazards. Moreover, in actual production, CrO3 is often added to sulfuric acid or nitric acid to achieve enhanced output. The purpose of the effect, but hexavalent chromium is a strong carcinogen, in order to protect the health of operators and the environment, it should be avoided

[0005] If this kind of ash is not treated cleanly, subsequent anodizing, dyeing, and sealing of the aluminum alloy will make the appearance very ugly and difficult to deal with. The follow-up treatment method is generally wiped with a damp cloth, and it is difficult to clean the groove, which costs a lot of money. manual, time consuming

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