Air mark inhibitor for two-acid chemical polishing of sand blasting surface aluminum alloy and preparation method of air mark inhibitor

Abstract

The invention discloses an air mark inhibitor for two-acid chemical polishing of a sand blasting surface aluminum alloy and a preparation method of the air mark inhibitor, and belongs to the technical field of chemical treatment of surfaces of aluminum alloy workpieces. The air mark inhibitor is prepared from 2-3wt.% of molybdate, 5-10wt.% of a corrosion inhibitor, 10-15wt.% of a surfactant, 10-15wt.% of water and the balance phosphoric acid, wherein the corrosion inhibitor is formed by mixing a hydroxyazo sulfonic acid substance, alanine and allyl thiourea. When a polishing solution containing the inhibitor is used for polishing a sand blasting surface aluminum alloy workpiece with holes, generation of air marks can be remarkably inhibited, and brightness unevenness caused by the air marks is reduced; and meanwhile, the polishing time can be effectively shortened, so that the surface marks and material surface exposure caused by long polishing time are reduced. The inhibitor can remarkably improve the yield and the production efficiency, reduces the production cost, is suitable for two-acid chemical polishing of 3C products with holes such as notebook computer shells, i PAD shells and mobile phone shells, and is particularly suitable for continuous production of an automatic line.

Description

technical field [0001] The invention relates to a gas mark inhibitor for chemical polishing and a preparation method thereof, in particular to a gas mark inhibitor for two-acid chemical polishing of an aluminum alloy on a sandblasted surface and a preparation method thereof, belonging to the technical field of surface chemical treatment of aluminum alloy parts . Background technique [0002] Traditional chemical polishing of aluminum and aluminum alloys usually uses a three-acid process containing phosphoric acid, sulfuric acid and nitric acid, but due to the strong oxidizing properties of nitric acid and the characteristics of nitric acid itself, toxic nitrogen oxides are likely to be produced during the process; Fluctuations in the concentration of nitric acid will cause uneven brightness of the polished surface. Therefore, at present, the polishing of most aluminum alloys has abandoned the above-mentioned three-acid process, and instead adopts the two-acid process, that ...

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Problems solved by technology

[0005] 2. There are very few additives on the market that are suitable for polishing aluminum alloy parts on sandblasting surfaces. After they are applied to the two-acid polishing solution, the polishing time is mostly longer than 120s, and even longer than 180s. Longer, and longer light emitting time, is likely to cause adverse phenomena such as flow marks, surface flowers, material grain exposure and uneven brightness on the surface of the product, resulting in a decrease in the yield rate;

[0006] 3. The polishing liquid on the existing market will generate gas when polishing the sandblasted aluminum alloy parts with holes (through holes and / or blind holes) or characters on the surface, and the gas will pass through the holes or along the edges of the characters. The outer wall of the workpiece overflows upwards, which will leave gas marks on the surface of the workpiece. The longer the polishing time, the more and more obvious the gas marks, resulting in a decrease in the yield

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