Reason for the darkening of water color after reducing the headspace and adding a corrosion inhibitor
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The following problems occurred after adding a corrosion inhibitor to the top-dropping water: the color of the water turned black after adding the inhibitor; after standing for some time, the black substance floated to the surface and the water became clear. Without a corrosion inhibitor, there is no black substance. What could the black substance be? Iron ions are currently not up to standard.
There is black material in the reduced-dome water cutting, suspected to be coking; I’m not sure what the concentration is What is the iron ion content? Excess iron ions indicate that the equipment is corroding. The harmful gases in the tower produce hydrochloric acid, which causes corrosion of the metals; I wonder what type of corrosion inhibitor you have used!
Corrosion is severe; continuously increase the injection volume
A protective film is formed first, after which the color and iron ions gradually decrease
After the iron ions stabilize, gradually reduce the injection amount
Maintain it at the normal injection volume, and conduct inspections on schedule
The injection volume is insufficient; increase the injection volume
Is it considering that corrosion has already occurred at the top of the tower, so as to increase the filling amount?
I suggest you analyze what the black substance is Based on the description, the black substance resembles FeS somewhat. FeS generally forms as a precipitation of iron ions in water at high pH levels, adhering to the interior walls of pipes; it can be easily washed away when fluctuations occur in the system (such as pH fluctuations or flow rate changes). Apart from device fluctuations, an excessive amount of dispersed components in the corrosion inhibitor or too low pH control can also lead to the washing away of FeS.
Is the color of the complex formed black? It would be better to check the ingredients
During the film-forming period, about 100 PPM is applied per week to facilitate film formation; after the film is formed, the iron ion content is considered to determine the amount of substance to be applied. Normally, this amount is 30 PPM, but it depends on the properties of the raw materials used