Why is the voltage at the cathode frame and individual cell slots 2 to 3 V higher than that of the other cell slots?
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The cause of this problem that occurred during the experiment of producing sodium dichromate using the electrolytic cell from Beihua Machinery has not been identified
Check the condition of the electrode coating; generally, such a high level indicates that the coating has fallen off or is corroded
The cell has been in use for ten years, and the anode coating has mostly worn off. But wouldn’t the loss of that coating cause the cell’s voltage to be much higher than that of other cells?
In our 94 cell slots, nearly half of them have a slot voltage that is 2 to 3 V higher than the normal level; during operation, the anodes of those slots with high voltages experience a cutoff in current flow. What exactly causes this phenomenon?
The original poster can provide more details about the specific situation. For example, the slot model, when it occurs and its duration, what are the distribution characteristics of the slots with increased voltage, and are there any other phenomena? Under what conditions does flow stop at the anode outlet (is there any current variation, or other actions occurring?), what was the previous operation of the cell (start-up, shutdown, etc.), and what are parameters such as cell flow rate? So that marine enthusiasts can provide answers in a timely manner.
In more than 30 cells, the cell voltage is high, with a value of over 5V at 4.1KA; in some cases it even exceeds 6V, resulting in an interruption in the flow of current to the anode. It is preliminarily inferred that the reason for these high cell voltages is severe peeling of the anode coating, which leads to oxidation and passivation of titanium, thereby causing abnormal cell voltages.