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The influence of the change of the liquid level in the tank

Release time:

2022-06-24 15:26

Effect of changes in tank liquid level

Under normal circumstances, the change of liquid level is relatively small. Usually, the amount of liquid brought in and carried out on the parts is basically close, but in different seasons and different regions, the solution will have greater fluctuations. For example, in dry areas, dry seasons, or when the exhaust air volume is large, the evaporation of the solution will accelerate, and the solution can be seen to decline day by day.

Taking the depth of the bath liquid of 800mm as an example, when the liquid level evaporates 80mm, the effective component in the solution is equal to an increase of more than 10%. If the original sulfuric acid concentration is calculated at 200g/L, the sulfuric acid concentration will exceed 220g/L at this time. If excessive water is added at this time and exceeds the original specified liquid level line, the concentration will be diluted again.

The increase or decrease of the liquid level, the tank liquid concentration will have a larger fluctuation. In this case, when anodizing decorative parts of high-quality aluminum,oxide film qualityThere will be visible changes. For example:

When the concentration is too high, the obtained oxide film is loose, pulverized, and falls off, and the film appears white spots. When the anodic oxidation time is longer, the corrosion resistance of the oxide film will decrease;

When the concentration is too low, the oxide film is prone to iridescent.

The change of the anodizing solution is not only related to the convenience of operation, but also directly affectsConcentration of solutionThe changes andQuality of anodic oxide film.

For this reason, when it is found that the liquid level of the anodic oxidation solution changes, it should be adjusted in time, and through laboratory analysis, the concentration of sulfuric acid in the solution is maintained within the process specification.