Chemical polishing method for complex surface of 3D printed aluminum alloy parts and application

Thermochemical polishing using a mixed solution of hydrofluoric acid, nitric acid, phosphoric acid, and water solves the problems of powder adhesion, slag buildup, and black silica ash on the surface of 3D printed aluminum alloy parts, achieving efficient and uniform surface smoothing. This method is suitable for 3D printed aluminum alloy parts with complex structures.

CN122189644APending Publication Date: 2026-06-12UNIV OF SHANGHAI FOR SCI & TECH
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SHANGHAI FOR SCI & TECH
Filing Date
2026-01-23
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing chemical polishing methods are difficult to effectively remove adhering powder, slag, and subsurface defects from the complex surfaces of 3D printed aluminum alloy parts, and are prone to forming black silica ash, which affects surface smoothness and corrosion resistance, and are also insufficient in applicability and efficiency.

⚗Method used

A mixed solution of hydrofluoric acid, nitric acid, phosphoric acid and water is used as a chemical polishing solution. By controlling the acid ratio and process conditions, thermochemical polishing is carried out. Combined with immersion or circulation drainage, surface defects are removed and a smooth surface is formed.

🎯Benefits of technology

It achieves efficient and uniform surface dissolution and leveling, removes adhering powder, slag and black silica ash, and obtains a high-quality polished surface, suitable for 3D printing aluminum alloy parts with complex structures.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122189644A_ABST
    Figure CN122189644A_ABST
Patent Text Reader

Abstract

The application provides a chemical polishing method for complex surfaces of 3D printed aluminum alloy parts and application. The method comprises the following steps: mixing hydrofluoric acid, nitric acid, phosphoric acid (or none) and water according to a volume ratio to prepare a polishing solution, heating the polishing solution to 30-80 DEG C to obtain a hot polishing solution, and performing chemical polishing on a part to be polished by immersion or drainage; after chemical polishing, the residual acid in the pipeline and the part is washed with deionized water and circularly washed for more than twice to ensure that the residual acid is completely removed, and finally drying is performed. The method can effectively remove the silica ash, adhered powder, slag and subsurface defects on the inner and outer surfaces of the 3D printed aluminum alloy parts, and obtain a uniform and smooth surface, has the advantages of high polishing efficiency, good effect and easy control of process conditions, and is suitable for high-efficiency polishing of complex surfaces of Al-Si series aluminum alloy parts formed by selective laser melting (SLM).
Need to check novelty before this filing date? Find Prior Art