Alkaline chemical polishing liquid for aluminum alloy

A chemical polishing, aluminum alloy technology, applied in the field of alkaline chemical polishing liquid, can solve problems such as unsafe, unenvironmental protection, and achieve the effect of solving worries, improving production efficiency, and brightening effect.

CN110592591AInactive Publication Date: 2019-12-20WUHAN RES INST OF MATERIALS PROTECTION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-12-20
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment 1

[0029] Polishing solution configuration: Dissolve 300g of sodium hydroxide particles in 1L of water, dissolve 150g of sodium silicate, 5g of sodium molybdate, and 0.6g of copper sulfate in the basic lye successively while the solution is hot, stir evenly, and set aside. The medicaments used are industrial grade reagents.

[0030] Sample preparation: The sample is a 5 series aluminum-magnesium alloy plate provided by a notebook computer accessories factory, the size is 100mm×60mm×2mm, and the surface has been sandblasted.

[0031] Polishing effect detection index: (1) Visually test the surface condition evaluation of the sample after polishing (uniformity, whether there are over-corrosion pits); (2) Use a gloss meter to measure the brightness value of the sample surface. (3) Calculate the weight loss (0.01 mg) of the sample before and after polishing with a mechanical analytical balance. The smaller the weight loss, the better the polishing quality.

[0032] The polishing proc...

Embodiment 2

[0040] Compared with Example 1, the difference of Example 2 is that there is no sodium molybdate oxidation bright component in the polishing liquid configuration.

Embodiment 3

[0042] Compared with Example 1, the difference of Example 3 is that in the polishing liquid configuration, 150g of sodium silicate is replaced by 150g of sodium hydroxide.