Reasons for cathode mesh corrosion

Simply put, there aren’t enough cycles, resulting in dead zones

Please explain the situation in detail, including the structural design and materials of the electrolytic cell and electrodes; only in this way can everyone truly help you and engage in mutual discussion. The corrosion of electrodes is often the result of a combination of several types of corrosion. Based solely on the description of corrosion at the upper edge of the cathode mesh, the explanation given for the second floor is not necessarily appropriate. If there is insufficient circulation and dead zones form, dry areas will first develop in the membrane, leading to the formation of pinholes; this in turn deteriorates the performance of the electrolyzer. The presence of these pinholes increases the concentration of NaCl in the cathode cell. If the material of the cathode mesh is 316L with a coating, its corrosion resistance is lower than that of nickel cathodes and coated surfaces. If the cathode mesh is made of nickel cathodes and coating, and a gas layer forms due to insufficient circulation of the catholyte, then pinholes and cracks in the ion membrane of the cell must have already appeared long before corrosion was detected at the upper edge of the cathode mesh. The structure of the forced circulation tank in Beihua Ji should be very similar to that of Asahi Kasei; there is a cathode weir above the cathode mesh in the cathode chamber, which prevents the formation of a gas zone in that area. Therefore, I would appreciate it if the original poster could provide more details on this matter.

The entire cathode mesh is made of 316L with a coating, but the condition of the membrane is fairly good; the upper edge of the entire cathode mesh has corroded. I hope everyone can help analyze this situation.