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5 points of aluminum die-casting anodizing coloring sealing process

5 points of aluminum die-casting anodizing coloring sealing process

5 points of aluminum die-casting anodizing coloring sealing process



  1. The anodizing temperature of die-cast alumina colouring is generally below 23 °C. If the temperature is too high, the consumption of cold sealant will be large, and the surface will turn green.


  2. When die-casting aluminum is anodizing and coloured, take out the falling aluminum in time. Otherwise, it will accelerate the increase of pH and fluorine consumption.



  3. It needs to be cleaned in time after anodizing because staying in the oxidation tank will affect the sealing. Otherwise, it will cause pollution and increase the fluorine consumption of the sealed tank.



  4. After the closed fluoride tank is regular with ammonium fluoride, it should fall once to clear the bottom. The hydrofluoric acid-adjusted fluorine sealed tank should be produced 5-10 minutes after addition, preferably in the form of a 10% dilute solution.


  5. To improve the sealing quality and speed up the drying speed, after cold sealing, it is recommended to wash with hot water at 55±5℃ for 10 to 15 minutes, also known as cold sealing post-treatment.

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