There are six types of aluminum oxidation: natural oxidation, electrochemical oxidation, chemical oxidation, alkaline oxidation, acid oxidation, and anodic oxidation, which means the oxidation treatment of aluminum and aluminum alloys. Today I will talk to you about the causes and solutions of aluminum oxide powder.
Causes and solutions of aluminum oxide powder
1. First, when the oxide film layer is powdery or dusty, we should try to wipe it off first. The plugging dust and electric shock dust caused by the closing process should be removed by sweeping.
2. Secondly, analyze the origin of oxidized fly ash one by one.
Generally, the dusting of the film layer is caused by the following points:
1. The temperature of the oxidation tank is too high;
2. The concentration of sulfuric acid is too low;
3. The aluminum ion content exceeds 18g/L. (The reason for the rapid increase in the aluminum ion content is mostly caused by the high temperature of the oxidation tank, and also because the oxidation tank is dropped and not salvaged in time.) The temperature of the oxidation tank is too high, and it is necessary to determine that the cooling engine is not equipped? If the normal cooling capacity is okay, then consider the size of the cold water circulation, whether the temperature caused by the blockage of the circulating water pump is too high, sweep them one by one.
The sulfuric acid content should be checked regularly and compensated for the consumption of sulfuric acid brought in from the oxidation tank every day. Keep the time within the process range (180-220g/L is best).
The temperature of the electrolyte has a great influence on the wear resistance of the oxide film. Generally speaking, if the temperature drops, the wear resistance of the anodic oxide film of aluminum and aluminum alloys will increase, which is caused by the decrease in the dissolution rate of the electrolyte for the film. , In order to obtain a higher hardness oxide film. We have to master the temperature within ±2℃ for hard anodizing treatment as well.