Right Now Aluminum Solar Frame is more and more popular used  all over the world, let us share some information about how to make good quality aluminum solar frame:

1,About solar aluminum frame sand blasting effect:

Analysis of Sandblasting Oxidation Black Lines on Solar Frame

As an important component of solar panels, the surface treatment process of solar frames has a crucial impact on their performance and appearance. Sandblasting and oxidation are common surface treatment processes,during these processes, there may sometimes be oxidation black lines, which affect the aesthetics and durability of the frame.

(1),Sandblasting process and anodizing electroplating process:

The sandblasting process is to impact the surface of the solar frame by high-speed spraying of sand particles to remove surface impurities, increase roughness, and provide good foundation for subsequent oxidation treatment. The anodizing electraplating process involves the formation of dense anodizing film on the surface of the frame through chemical reactions, which enhances the corrosion resistance and hardness of the frame.

(2),The origin of anodizing eletroplating black lines:

aluminum anodizing black lines usually appear during the oxidation process after sandblasting, mainly due to improper sandblasting treatment or unreasonable setting of oxidation process parameters. The specific reasons include: uneven sandblasting particle size, excessive or insufficient sandblasting pressure, improper control of oxidation temperature and time, etc. These factors may all lead to excessive or insufficient oxidation in local areas of the border surface, resulting in the formation of black lines.

(3),The influence of anodizing electroplating black lines

Black oxide lines not only affect the aesthetic appearance of solar frames, but may also reduce their corrosion resistance and service life. The black line area is susceptible to external environmental erosion due to incomplete oxide film, resulting in decrease in frame performance. In addition, black lines may also affect the overall performance and stability of solar panels.

(4),Method for treating anodizing electroplating black lines

To address the issue of oxidized black lines, the following measures can be taken:

1. Optimize the sandblasting process parameters to ensure uniform particle size and moderate sandblasting pressure, in order to achieve good surface roughness.

2. Strictly control the oxidation process conditions, including temperature, time, and concentration of the oxidation solution, to ensure that the oxide film is uniform and dense.

3. Rework the frames with oxidized black lines, such as sandblasting, cleaning, and oxidation, to eliminate the black lines and improve the quality of the frames.

By implementing the above measures, the problem of sandblasting and oxidation black lines on solar frame can be effectively solved, and the performance and appearance quality of the frame can be improved.

How to make good anodizing electroplating effect for solar aluminum frame:

Before machining, solar frames also require sandblasting and anodizing treatment. Sandblasting is a physical change, while oxidation is a chemical change, and the reaction process is quite complex. Today, we will learn about the principle of anodizing solar frames. Anodizing is a chemical reaction in which electricity is applied. The reaction equation occurring on the anode and cathode:

2H+ + 2e-=H2 ↑

4OH-+4e- =2H2O+O2 ↑

2Al3++3O2-=Al2O3+heat

Aluminum element in aluminum alloy is oxidized by oxygen generated by anodic reaction, forming an aluminum oxide film. In the reaction equation, molecular oxygen is represented, but there are also oxygen ions and oxygen atoms present. A portion of oxygen overflows from the anode in the form of gas.

The above reaction equation represents the rapid formation of a thin and dense oxide film on the surface of aluminum profiles after being electrified. However, some of the oxide film will dissolve when exposed to sulfuric acid solution, resulting in the porous nature of the oxide film.

Then the electrolyte flows into the gaps of the oxide film and reacts with the aluminum inside, forming a new layer of oxide film, similar to the oxide film before repair, and then returns to the previous step where the oxide film dissolves to form pores, causing a cyclic reaction. The continuous generation of oxide films from the metal surface also leads to the appearance of porous outer films. This is why the oxide film generated by anodizing is thicker than that of ordinary oxide films. But no matter how long the reaction takes, the oxide film on the surface is porous and cannot protect the substrate. Therefore, sealing the pores is a very important step in anodizing.

The sealing methods include high-temperature hydration reaction sealing, low-temperature hydration reaction sealing, and organic coating sealing. Let's first introduce the hydration reaction.

Low temperature sealing and high temperature sealing are both completed in aqueous solution, and hydration occurs. However, due to the low temperature, the hydration reaction of low-temperature pore sealing will be slow. Fortunately, the low-temperature pore sealing solution contains some fluorine and nickel ions, which can accelerate the hydration reaction.

Fluoride ions are highly surface active anions that easily undergo special adsorption on oxide films and react with them to form fluorinated aluminum compounds with pore sealing properties.

The strong adsorption of nickel ions and the negative charge of the oxide film during the above reaction promote the diffusion of Ni2+into the pores and form Ni (OH) 2 with OH - to fill the pores of the oxide film. Currently, low-temperature sealing is gradually replacing high-temperature sealing.

After sealing the hole, the anodizing process is completed by washing with water. The solar frame requires a higher film thickness, so the anodizing time will be longer than that of ordinary materials. The thicker the aluminum profile film, the stronger its corrosion resistance and the longer its lifespan.

Aluminum solar frame automatic sand blasting and anodizing electroplating production plant working video:

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