An environment-friendly chemical polishing liquid for aluminum without phosphorus and nitrogen elements

Abstract

The invention relates to an environmentally friendly chemical polishing solution for aluminum materials without phosphorus and nitrogen elements, which uses sulfuric acid with a content of 500-1500g / L and sulfonic acid with a content of 50-800g / L as the basic system, and is formulated with a content of It is made of a specific metal salt of 0.01-100g / L and a specific complexing agent with a content of 1-200g / L. The beneficial effects of the invention are: the surface gloss of the aluminum material can be significantly improved, the uniformity of the polished surface of the aluminum material can be improved, and a smooth and consistent surface can be obtained; the harmful nitrogen oxides formed by the decomposition of nitric acid will not be produced during the chemical polishing process, and the Realize the true "zero" discharge of phosphorus and nitrogen at the root.

Description

technical field [0001] The invention relates to an aluminum material chemical polishing liquid, in particular to an environment-friendly aluminum material chemical polishing liquid which does not contain phosphorus and nitrogen elements. Background technique [0002] Due to the advantages of light weight, good processing performance and colorful anode colors, aluminum alloys are more and more widely used in the field of 3C casings. For aluminum alloys, phosphoric acid-based chemical polishing fluids are the most widely used, including the classic phosphoric acid-sulfuric acid-nitric acid triacid system, phosphoric acid-sulfuric acid two-acid system without yellow smoke, phosphoric acid-nitric acid two-acid system, and monophosphoric acid polishing and other systems. [0003] As environmental protection requirements become more and more stringent, chemical polishing systems containing nitric acid or nitrates that are prone to nitrogen oxide (NOx) fumes have been gradually re...

AI Technical Summary

Problems solved by technology

At present, the alkaline chemical polishing system still has many problems such as slow light output speed, large amount of corrosion on the aluminum material during the polishing process, and poor surface texture of the aluminum material after polishing.

[0005] As a result, the existing aluminum chemical polishing technology fails to use any phosphorus and nitrogen compounds from the source, eliminates the discharge of phosphorus and nitrogen elements from the source, and fails to achieve the unity of green environmental protection and polishing performance, thus Alleviate the sewage treatment pressure of related enterprises

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