Aluminum product chemical polishing solution and polishing method thereof

A technology of chemical polishing and aluminum products, which is applied in the field of chemical polishing liquid and its polishing of aluminum products, can solve problems such as the inability to fundamentally eliminate the hazard of NO, the inability to meet the brightness requirements of the "three-acid" polishing process, and unstable polishing effects. Achieve the effects of inhibiting transfer corrosion, reducing over-corrosion points, and easy cleaning

Inactive Publication Date: 2009-07-08
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many patents proposed in the past, such as USP3119726 "Process and composition for brightening Aluminum", USP3301787 "Chemical brightening of Aluminum", USP3202612 "Chemical brightening of Aluminum", etc., all proposed NH 4 + It can suppress the NO produced during the tri-acid polishing process of aluminum materials 2 Yellow smoke, but heavy use of NH 4 + It will digest a large amount of free phosphoric acid in the polishing solution, and at the same time cause the polishing effect to be unstable
Patent 200610034224.X "can reduce NO 2 Smoke-damaged aluminum two-step chemical polishing method "greatly reduces NO in the aluminum polishing process 2 Smoke damage, but can not fundamentally eliminate NO 2 the harm of
[0004] Since the 1970s, countries around the world have begun to study the "two-acid" chemical polishing process without nitric acid, and have achieved some results. However, in general, the polishing brightness is not enough to reach the traditional "three-acid" polishing process. Brightness requirements

Method used

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  • Aluminum product chemical polishing solution and polishing method thereof

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Comparison scheme
Effect test

Embodiment 1

[0016] Polishing liquid formula: sulfuric acid 77g, phosphoric acid 23g, aluminum sulfate 1.8g, potassium permanganate 0.11g, sodium nitrate 0.22g, sodium diphenylamine sulfonate 0.11g, tartaric acid 0.11g, zinc sulfate 0.22g.

[0017] A chemical polishing method for aluminum products, comprising the steps of:

[0018] (1) mix and make polishing liquid by above-mentioned component distribution ratio;

[0019] (2) Heating the polishing solution to 120°C;

[0020] (3) Immerse the dry and clean aluminum product to be polished in the polishing solution, and take it out after polishing for 60 seconds;

[0021] (4) Immediately wash the aluminum products taken out with tap water, then rinse with pure water, and dry.

[0022] Chemical polishing quality evaluation: (1) reflectivity: 134.46%; (2) weight loss rate: 2.0753g / dm 3 ;

Embodiment 2-6

[0024] The polishing liquid formula, polishing conditions, and polishing quality evaluation are shown in Table 1.

[0025] Table 1 Polishing liquid formula, polishing conditions, polishing quality evaluation

[0026]

[0027] The present invention compares with tri-acid polishing:

[0028] Tri-acid polishing has a reflectivity of 100% and a weight loss rate of 2.38g / dm 3 . The reflectance of each embodiment exceeds the tri-acid polishing process, and the weight loss rate is smaller than the tri-acid polishing process.

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Abstract

The invention discloses an aluminium product chemical polishing solution composition with nitric acid free. The composition uses sulfuric acid and phosphoric acid as a basic solution, an additive is composed of aluminium sulphate (or aluminium nitrate), potassium permanganate, sodium nitrate, diphenylamine sulfonic acid sodium salt, tartaric acid and zinc sulfate. Polishing temperature is 110-150 DEG C, polishing time is 10s-120s when the polishing solution is used for polishing. The composition can ensure no nitrogen oxide yellow smoke harm, at the same time ensure the aluminium product having better polishing blare effect for reaching mirror surface brightness, and having little rate of weight loss.

Description

technical field [0001] The invention relates to a chemical polishing liquid composition, in particular to a chemical polishing liquid for aluminum products and a polishing method thereof. technical background [0002] Chemical polishing is an important finishing method for aluminum products. At present, in the chemical polishing process of aluminum products at home and abroad, the traditional "three acid" chemical polishing process is basically used. A large amount of yellow nitrogen oxide gas is produced during polishing, causing air pollution and public nuisance, and seriously affecting the health of workers. [0003] Aiming at the hazards of a large amount of nitrogen oxide yellow smoke produced during the surface treatment of aluminum tri-acid chemical polishing, many countries around the world have explored many NO 2 Inhibition methods, but so far, the hazard of nitrogen oxide yellow smoke is still the main problem that plagues the production and development of alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F3/03
Inventor 张生万张艳红冯彦琳
Owner SHANXI UNIV
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