Polished aluminum sheet metal

Compared with the untreated aluminum alloy sheet, polished aluminum sheet metal has improved performance, such as high tensile strength, oxidation resistance, and corrosion resistance. At the same time, the appearance of the polished aluminum sheet is regular, the surface is smooth and flat, and no obvious flaws are visible to the eyes.



How many ways are there for polished aluminum sheet metal?

We know that the aluminum sheet is a kind of material that is easier to scratch. Therefore, in many alloys, it is also difficult to polish and polish aluminum alloy. We have summarized 6 kinds of polished aluminum sheet metal processing methods commonly used by manufacturers for everyone to read.


1. Mechanical polishing

Mechanical polishing is a polishing method that relies on cutting, plastic deformation of the material surface to remove the polished convex parts to obtain a smooth surface. Generally, oil stone strips, wool wheels, sandpaper, etc. are used, and manual operation is the main method. Intensive research and throwing methods.

Ultra-precision polishing is to select a special abrasive tool, which is pressed tightly on the processed surface of the polished aluminum sheet metal in a polishing liquid containing abrasives for high-speed rotation. Using this technique, the surface roughness of Ra0.008μm can be reached, which is the highest among various aluminum alloy grinding and polishing methods. This method is often used for optical lens molds.


2. Chemical polishing

Chemical polishing is to allow the polished aluminum sheet metal to dissolve the microscopically convex part of the surface in the chemical medium preferentially than the concave part, and then obtain a smooth surface. The main advantage of this method is that it does not require messy equipment, can polish many plates together, and is highly efficient. The difficult problem of chemical polishing is the manufacture of polishing liquid. The surface roughness obtained by chemical polishing is generally several 10 μm.

3. Electrolytic polishing

The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, it relies on the selective dissolution of the small protruding parts of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of cathode reaction, and the effect is better.

The electrochemical polishing process is divided into two steps: (1) The microscopic leveling and dissolving products diffuse into the electrolyte, and the surface roughness of the polished aluminum sheet metal is slightly reduced, Ra>1μm. (2) Low-light flat anode polarization, improved surface brightness, Ra<1μm.


4. Ultrasonic polishing

Put the aluminum alloy sheet into the abrasive suspension and place it in the ultrasonic field together. Relying on the oscillating effect of the ultrasonic, the abrasive is ground and polished on the surface of the sheet. Ultrasonic processing has a low micro force and will not cause material deformation, but it is difficult to make tooling and equipment. Ultrasonic processing can be combined with chemical or electrochemical methods.

On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to mix the solution to separate the dissolved products on the surface of polished aluminum sheet metal, and the corrosion or electrolyte adjacent to the surface is uniform; the cavitation effect of ultrasonic in the liquid can also suppress the corrosion process, which is beneficial to the appearance Brighten up.


5. Fluid polishing

Fluid polishing is to rely on high-speed moving liquid and the abrasive particles carried by it to wash the aluminum sheet surface to achieve polishing. Common methods are abrasive eruption processing, liquid eruption processing, hydrodynamic grinding, and so on.

Hydrodynamic grinding is driven by hydraulic pressure so that the liquid medium with abrasive particles flows back and forth through the polished aluminum sheet metal at high speed. The medium is mainly made of special compounds (polymer-like substances) with good flowability under lower pressure and mixed with abrasives. The abrasives can be made of silicon carbide powder.

6. Magnetic grinding and polishing

Magnetic abrasive polishing is the use of magnetic abrasives to form abrasive brushes under the effect of a magnetic field to grind polished aluminum sheet metal. This method has high processing efficiency, good quality, simple processing conditions, and good working conditions. Choose suitable abrasive, the surface roughness can reach Ra0.1μm.


The above is about the polished aluminum sheet metal treatment process. Henan Mingtai Aluminum’s main products include 1xxx, 3xxx, and 5000 series aluminum alloy sheets. The products have undergone repeated, scientific, and rigorous quality inspections. They have the advantages of superior performance and excellent market reputation. Welcome to consult and purchase.