The surface on the cathode side of the membrane has turned black
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Today, we replaced the membrane in the electrolyzer cell, and noticed that the area 20 cm below the membrane had turned black. Please discuss what might be the cause of this
The description is not detailed enough; it can be preliminarily concluded that the cathode solution coating has peeled off； The possible cause is 1: during parking, the free chlorine in the anode solution was not completely removed, and it seeped into the anode, leading to the peeling of the coating ； 2. It’s also possible that the pressure difference control is not proper during parking, resulting in high pressure on the anode side ； 3. It is caused by draining from the cathode side first during liquid discharge ；
Does it have water purification, filtering, and backwashing functions?
Could you attach a high-resolution photo? It would be best to have one showing both the ion membrane and the cell tank. If the polarizing coating peels off, the fluctuations in the cell slot voltage curve can reflect this; it is recommended to examine the DCS curve. Furthermore, the black color resulting from the peeling coating appears as patches of dark gray or dark brown. It could also be caused by a high iron ion content in the cathode system, corrosion of the materials in the alkali circulation system, or by the pure water used as a diluent for the cathode solution. As iron deposits on the cathode, its amount gradually increases; however, this situation can be determined by examining the outlet hoses and main pipes. It’s difficult to determine the specific cause. The ion exchange membrane may have pinholes, and a high chloride content; inadequate drainage during shutdown or proper replacement during startup can also lead to this issue
No, upon further observation, it is estimated that repairs will begin in about a year
Improper handling led to the peeling of the cathode coating
Improper handling led to the peeling of the cathode coating