Causes and Solutions of Aluminum Oxidation Powder
There are six types of aluminum oxidation: natural oxidation, electrochemical oxidation, chemical oxidation, alkaline oxidation, acid oxidation, and anodic oxidation. This means oxidation of aluminum and aluminum alloys. Today, Cangqing Metal Xiaobian talks to everyone about the causes and solutions of aluminum oxide dusting.
First, when the oxide layer is dusty and gray, we should first try to wipe it out. Remove dust from plugging and electric shock caused by the closing process.
Next, the origin of oxidation ash was analyzed one by one.
In general, the film from the powder ash caused by the following points:
1 oxidation tank temperature is too high;
2. The concentration of sulfuric acid is too low;
3. The aluminum ion content exceeds 18g/L. (The reasons for the rapid increase in the content of aluminum ions are also caused by the high temperature of the oxidation tank, and then there is no timely recovery of the missing parts of the oxidation tank.)
Oxidation tank temperature is too high, it must be determined that the cold-motivation equipment is not big enough? If the normal cooling capacity is also OK, then we must consider the size of the cold water circulation, whether the circulation pump blockage temperature is too high, one by one to sweep away.
Sulfuric acid content should be taken into the sulfuric acid spent in the oxidation tank every day, and sulfuric acid should be periodically detected and compensated. The time is kept within the range of the process (180-220g/L best).
The electrolyte temperature has a great influence on the wear resistance of the oxide film. In general, if the temperature drops, the wear resistance of the anodic oxide film of aluminum and aluminum alloy will increase, which is due to the decrease of the dissolution rate of the electrolyte for the film. , In order to obtain a higher hardness of the oxide film. We must grasp the temperature in the ± 2 °C range for hard anodizing as well.
