Key points of the process of die-casting Aluminum oxide coloring and sealing
In order to improve the anti-pollution and anti-corrosion performance of the oxide film, sealing is an indispensable step. Let’s take a look at the key points of the die-cast aluminum oxidation coloring sealing process.
In order to improve the anti-pollution and anti-corrosion performance of the oxide film, sealing is an indispensable step. Let’s take a look at the key points of the die-cast aluminum oxidation coloring sealing process.
1. The anodizing temperature of die-cast aluminum oxidation and coloring is generally less than 23°C. If the temperature is too high, the cold sealing agent will be consumed and the surface will be green.
2. When the die-cast aluminum is oxidized and colored, the aluminum material and aluminum wire that fall off the sealing groove should be taken out in time, otherwise it will accelerate the rise of pH and the consumption of fluorine.
3. After anodizing, it should be washed with water in time. Staying in the oxidation tank will affect the subsequent sealing. If it is not cleaned, it will easily cause the pollution of the channeling liquid, which will increase the fluorine consumption of the sealing tank.
Fourth, use ammonium fluoride to adjust the fluorine sealing tank, after each cubic meter of 20t aluminum material, the bottom of the tank should be cleared once. The sealing tank for adjusting fluorine with hydrofluoric acid should be produced after 5 to 10 minutes after addition, and it is best to add it in the form of a 10% dilute solution.
5. In order to improve the sealing quality and speed up the drying speed, after cold sealing, it is recommended to wash in hot water at 55±5℃ for 10-15 minutes, also called cold sealing post-treatment.
The above are the key points of the die-cast aluminum oxidation coloring sealing process. Ammonium ions in the sealing tank are less likely to be powdered than sodium ions, but the sealing speed is slower.
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