Alkaline chemical polishing liquid for aluminum alloy

Abstract

The invention discloses alkaline chemical polishing liquid for aluminum alloy and especially discloses alkaline chemical polishing liquid which is free of phosphorus and nitrogen components. The alkaline chemical polishing liquid comprises 4 g / L to 6 g / L of an oxidization brightener, 300 g / L to 350 g / L of sodium hydroxide, 100 g / L to 150 g / L of an inorganic thickening agent, 0.5 g / L to 0.8 g / L ofcopper sulfate and the balance water; the oxidization brightener is selected from one or several of molybdate, tungstate and silicon-molybdenum heteropolyacid salt; and the inorganic thickening agentis selected from sodium carbonate or sodium silicate. The chemical polishing liquid disclosed by the invention entirely contains no components such as phosphorus, nitrogen or fluorine which is harmfulto environment; the polished surface of an obtained sample is uniform in surface gloss, exquisite and beautiful; moreover the polishing brightness is high; weight loss is small; and the alkaline chemical polishing liquid meets the requirements, on polishing quality, of relevant electronic products. The alkaline chemical polishing liquid disclosed by the invention can be used for replacing the original acidic or alkaline phosphorus and nitrogen containing polishing liquid, completely eliminates the pollution caused by emission of phosphorus and nitrogen in waste liquid of the chemical polishing liquid to a water environment and improves polishing production efficiency and the economical efficiency of an enterprise.

Description

Technical field [0001] The invention relates to the field of aluminum alloy surface technical treatment, and specifically relates to an alkaline chemical polishing liquid without phosphorus and nitrogen components on the aluminum alloy surface. Background technique [0002] Chemical polishing is a technology that requires no external power supply, is easy to operate, has high efficiency, and is suitable for surface brightening of complex metal workpieces. Aluminum and its alloy materials are used in large quantities and in a wide range of fields. Compared with other metal materials, the surface of aluminum alloy is more suitable for chemical polishing process, and its polished parts can achieve a mirror-like bright effect. Therefore, the related aluminum alloy chemical polishing technology has been studied the most and is also one of the most commonly used aluminum alloy surface treatment technologies. [0003] Aluminum alloy chemical polishing can be divided into acidic an...

AI Technical Summary

Problems solved by technology

[0006] Alkaline chemical polishing of aluminum alloys is mostly focused on improving the brightness, reducing or removing the impact of phosphorus on the water environment, and how to eliminate nitrogen-containing pollution is rarely involved.

Such as Chinese patent CN102925900A discloses a kind of aluminum alloy alkaline polishing liquid, its composition contains the sodium nitrite of 100~150g / L, the sodium phosphate of 10~20g / L; In the alkaline polishing liquid disclosed in CN103668228A, contain 145- Ammonium nitrite of 180g / L, sodium nitrate of 155~200g / L, sodium phosphate of 100-150g / L; similarly, the document disclosed in Japanese Patent JPS55845380A contains ingredients such as sodium nitrate, sodium nitrite, sodium phosphate, recent Chinese patent Both CN104694931A and CN106676529A disclose a phosphorus-free aluminum alloy chemical polishing solution, but the formula still contains 50-200 g / L of sodium nitrate, 25-100 g / L of sodium bromate, a small amount of sodium fluoride, etc. safe ingredients

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