Additive for two-acid chemical polishing of sandblasted surface aluminum alloy, chemical polishing solution and preparation method of additive for two-acid chemical polishing of sandblasted surface aluminum alloy

Abstract

The invention discloses an additive for two-acid chemical polishing of sandblasted surface aluminum alloy, a chemical polishing solution and a preparation method of the additive for two-acid chemical polishing of the sandblasted surface aluminum alloy, and belongs to the technical field of metal surface treatment. The additive is prepared from components in percentage by mass as follows: 70-80 wt.% of phosphoric acid, 10-12 wt.% of corrosion inhibitor, 7-10 wt.% of stabilizer and 3-8 wt.% of surfactant. The two-acid chemical polishing solution comprises a polishing base solution formed by mixing sulfuric acid and phosphoric acid and the additive. The additive and a polishing agent containing the additive can remarkably relieve the undesirable phenomena such as flow marks, surface scratches, material texture exposure and uneven brightness on the surface of a sandblasted aluminum alloy workpiece, and the product yield is increased; meanwhile, the surface shining speed of the product is high, the production efficiency can be improved, and the production cost is reduced. The additive and the chemical polishing solution are suitable for two-acid chemical polishing of aluminum products, such as laptop shells, iPAD shells and mobile phone shells, of 3C products, and particularly suitable for continuous production of an automatic line.

Description

technical field [0001] The invention relates to a chemical polishing additive, a polishing liquid and a preparation method thereof, in particular to an additive for two-acid chemical polishing of an aluminum alloy on a sandblasted surface, a chemical polishing liquid and a preparation method thereof, and belongs to the technical field of metal surface treatment. 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 i...

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides an additive for two-acid chemical polishing of an aluminum alloy on a sandblasting surface, a chemical polishing liquid and a preparation method thereof. , There are material lines and uneven brightness. At the same time, the light output speed is fast, which can greatly improve production efficiency. It is suitable for two-acid chemical polishing of 3C products such as notebook casings, iPAD casings, mobile phone casings and other aluminum products, especially for automatic line continuous For production

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