The secret of aluminum "life" and surface treatment process

When purchasing aluminum row products, do you hope that the longer the service life, the better? Do you know that the service life of the aluminum row is closely related to its surface treatment process? Do you know that substandard aluminum surface treatment process makes the aluminum “life”, and that qualified processing can increase the service life?

Pure aluminum is very soft and has good ductility. It can be drawn into filaments and rolled into foils. Therefore, it is the best choice for making cold aluminum rows. There are many kinds of aluminum surface treatment processes, of which the most widely used aluminum row products are: pickling, sandblasting, alkali etching, acid sand and other processes. Among them, sandblasting is a physical method process, and others are chemical method processes. What are the differences between these processes? Which processes are more suitable for use in cold storage aluminum row? What is the relationship between these processes and the "lifespan" of the aluminum row?

The pickling process is a method of removing scale and rust on a metal surface using an acid solution. The use of pickling takes a long time, resulting in high processing costs. The effect is not ideal for thick scales, especially the black slag at the welding area can not be removed. Moreover, its corrosion resistance is difficult to achieve the ISO national standard, because it has aluminum fluoride adhered to the surface of the aluminum row, and the oxidation hole after oxidation is relatively large, prone to uneven surface treatment.

Therefore, the surface of the aluminum row produced by this process is not clean and has poor airtightness, and it is easy to cause hidden troubles of natural leakage. If leakage problems occur, the service life of the aluminum row will be greatly shortened, thereby bringing more cost burden to the cold storage.

The sandblasting process is powered by compressed air to form a high-speed jet beam. The spray material (copper ore, quartz sand, corundum, iron sand, Hainan sand) is jetted at high speed onto the surface of the workpiece to be processed, making the appearance of the outer surface of the workpiece surface. Or the shape has changed. Sandblasting has defects in the use of aluminum bars due to the inability to uniformly treat corners and transitions.

The alkaline etching process is a high quality requirement for aluminum materials and can only be applied to pure aluminum ingots. As the alkaline etching process requires high if the alkaline corrosion is not good will cause the appearance of long pits, spots and so on. If producers use recycled aluminum plus this process, the aluminum row produced will produce a lot of harmful substances, which will directly cause health hazards.

In the introduction of sour sand technology, aluminum is a highly negative metal, has a strong affinity for oxygen atoms, aluminum will generate a thin and dense oxide film in the air, this layer of oxide film has a certain degree of protection effect. However, the time required for the formation of the protective film in the natural environment is as long as 48 days or more, and is not uniform. Therefore, the corrosion resistance and airtightness of the aluminum row coming out of the natural environment are not good, and the refrigerant leaks easily. The acid sand process is to make the aluminum evenly generate 8-12 filaments of oxide film in a very short period of time to protect the aluminum row.

Since the electrical conductivity of such an oxide film is very low, it is possible to prevent the cathode reaction so that aluminum does not corrode. The thickness of the anticorrosion layer of the aluminum row product produced by this process is uniform and the chemical properties are stable, which can effectively reduce the leakage problem of the refrigerant. Therefore, to a certain extent, the service life of the aluminum row product produced by using this process will be far longer than other products. Process products.

The length of life of the cold storage aluminum row is closely related to its surface treatment process. Selecting a more cost-effective aluminum row product for refrigeration contractors, refrigeration dealers, and end customers not only ensures the normal operation of the cold storage, but also saves on subsequent maintenance. A lot of cost.