A kind of chrome-free electropolishing liquid, the method for aluminum alloy electropolishing and automobile aluminum decorative parts

An electropolishing and electrolytic polishing technology, which is applied in the field of electrolyte, can solve the problems of large environmental impact and increased waste water treatment cost, and achieve the effect of fine texture, simple and feasible method, and good gloss

Active Publication Date: 2019-08-02
JIANGSU HEXING AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General traditional electropolishing process formula: 40% sulfuric acid, 50% phosphoric acid, 10% chromic acid. Although chromic acid can significantly improve product gloss and stabilize the process, this traditional electrolytic polishing process contains chromic acid, which has a great impact on the environment. , has long been listed as a pollution source of environmental protection control, and environmental protection regulations require that chromium-containing wastewater must be treated separately, which greatly increases the cost of wastewater treatment

Method used

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  • A kind of chrome-free electropolishing liquid, the method for aluminum alloy electropolishing and automobile aluminum decorative parts
  • A kind of chrome-free electropolishing liquid, the method for aluminum alloy electropolishing and automobile aluminum decorative parts
  • A kind of chrome-free electropolishing liquid, the method for aluminum alloy electropolishing and automobile aluminum decorative parts

Examples

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Embodiment 1

[0036] A kind of chromium-free electropolishing fluid, with the weight of chromium-free electropolishing fluid as a benchmark, described chromium-free electropolishing fluid comprises phosphoric acid 55%, sulfuric acid 43.5%, additive 1.5%, and described additive is acetic acid, xylitol In the mixture with isopropanol, the contents of acetic acid, xylitol and isopropanol respectively account for 0.45%, 0.75% and 0.3% of the total mass of the electropolishing liquid.

Embodiment 2

[0038] A kind of chromium-free electropolishing fluid, with the weight of chromium-free electropolishing fluid as a benchmark, described chromium-free electropolishing fluid comprises phosphoric acid 56%, sulfuric acid 42.9%, additive 1.1%, and described additive is tartaric acid, xylitol In the mixture with isopropanol, the contents of tartaric acid, xylitol and isopropanol respectively account for 0.4%, 0.525% and 0.175% of the total mass of the electropolishing liquid.

Embodiment 3

[0040] A kind of chromium-free electropolishing fluid, with the weight of chromium-free electropolishing fluid as a benchmark, described chromium-free electropolishing fluid comprises phosphoric acid 52%, sulfuric acid 46%, additive 2%, and described additive is oxalic acid, xylitol In the mixture with isopropanol, the contents of oxalic acid, xylitol and isopropanol respectively account for 0.5%, 1% and 0.5% of the total mass of the electropolishing liquid.

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Abstract

The invention relates to a chromium-free electropolishing solution, a method for electropolishing of aluminum alloy and an automotive aluminum decoration part, and belongs to the technical field of electrolytes. The chromium-free electropolishing solution is prepared from, by weight, 50%-60% of phosphoric acid, 40%-50% of sulfuric acid and 1%-2% of additive, wherein the additive is a mixture which at least contains an organic acid or an inorganic salt and an alcohol. The electropolishing solution does not contain harmful hexavalent chromium ions, matching of the aluminum content is omitted by increasing the content of sulfuric acid and decreasing the content of the additive, it is guaranteed that the electropolishing solution is environmentally friendly and harmless, and meanwhile the electropolishing solution is suitable for the aluminum alloy, particularly suitable for the automotive aluminum decoration part. In addition, the method for conducting electropolishing treatment on the aluminum alloy with the electropolishing solution is simple and feasible, an aluminum alloy product with good quality can be obtained at lower temperature, and particularly, the automotive aluminum decoration part with good glossiness and exquisite texture can be obtained.

Description

technical field [0001] The invention relates to a chrome-free electropolishing liquid, a method for electropolishing aluminum alloys and an aluminum decorative part of an automobile, belonging to the technical field of electrolytic solutions. Background technique [0002] With the improvement of people's living standards, the aesthetics have become more diverse. Car bodies have begun to use bright decorative strips to attract consumers, such as roof frame bright strips, window frame bright strips, luggage racks, tailgate decorative strips, etc. Aluminum alloy decorative bright strips are widely used in the automotive industry due to their light weight, easy molding, and rich colors. [0003] Aluminum alloy decorative bright strips can only be used after anodizing. Electrolytic polishing is an important process in the anodizing process. The quality of electrolytic polishing directly determines the brightness of the product. General traditional electropolishing process formul...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C25F3/20C23G1/22C23G1/12
CPCC23G1/125C23G1/22C25F3/20
Inventor朱伟
OwnerJIANGSU HEXING AUTOMOTIVE TECH