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Four common surface treatments for aluminum sheet
Nov 01, 2019

Four common surface treatments for aluminum sheet 

A. Skill requirements for aluminum plate base

The basic skill requirement for the manufacture of the PS plate of the aluminum plate base is that the appearance is smooth and flat, without scratches, pits, marks, non-golden press-in, air holes, rolling mark and other apparent defects.Moreover, the thickness should be uniform, and the wave level is controlled within 1mm while the straightness is less than 2I; The structure should be fine and uniform, no segregation, slag inclusion and the internal stress is divided into symmetry and uniformity; The roughness Ra value is less than 0.28, to ensure the fine and uniform electrolytic graining. At present, many of the plate-based materials used in China are 1050A, 1060 and so on.

B. Alkaline Washing

Generally, aluminum plate supplied by processing plant has a certain amount of oil on the surface, and the oil and the oxide film have an influence on the disposal of the sand. In the production of the PS plate, the hot alkali is usually used to wash the aluminum plate for surface treatment.

The alkali solution is generally used to remove the oxide film and oil. The ratio of common degreasing liquid is: corrosion inhibitor such as sodium NaOH, and external surfactant such as sodium gluconate, fatty acid polyoxyethylene ether solubilization and complexation.

In addition, the temperature of the degreasing liquid is generally controlled at about 55 ~ 60 ° C, the effect of degreasing is related to the temperature of the solution. If the temperature is too high, the aluminum plate base will be seriously corroded, therefore it is necessary to control the temperature.

C. Pickling

In the production process, after the alkali washing, there is a nitric acid pickling process which purposes to remove the residual substance after the alkali washing and neutralizes the remaining alkali liquid. The mass concentration of the nitric acid solution is 5% to 10%. When preparing, carefully dilute the nitric acid into the water and mix well. In the process of pickling, the concentration of the solution should be carefully observed and compensated in time.

D roughening

The roughening is to form a sand structure with a required roughness. The roughening can not only improve the hydrophilcity of the aluminum plate base, but also improve the surface wetting amount of the plate base to avoid the dirty surface; the roughened appearance can also improve the adhesion of the plate to the sensitizer, thereby improving the printing durability of the plate. force.

Contact information

Gloria Gao

Sales Representative

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