Corrosion inside the electrolyzer
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During the electrolysis of saltwater, can corrosion occur at the welds of titanium materials inside the electrolyzer? ? Can titanium damage the coating during welding? ? How can it be avoided? ? ? ? What should be considered when welding titanium?
For someone working in chlor-alkali production companies, I have never considered this issue; it should be asked of the manufacturers.
During operation, the chassis of the electrolyzer generally does not get corroded. Leaks occur mainly due to corrosion in the surrounding gaps, or when the ion membrane leaks and caustic solution penetrates through it to corrode the anode. Leaks can also result from pores or welding defects in previous welds. When a leak occurs in the chassis, professional technicians are required for repairs, and the face mesh must be removed.
During operation, electrolyzers suffer from crevice corrosion and electrochemical corrosion. Ensure the proper functioning of the corrosion protection electrodes and sacrificial electrodes in the electrolytic cell. Proper insulation of the surrounding piping can prevent corrosion of titanium. For welding titanium, proper argon shielding is essential.
Quality is guaranteed, and under normal operating conditions it generally does not happen; under these conditions titanium tends to become passivated. Gap corrosion at the anode sealing surface of the electrolytic cell can occur; moreover, the gaskets are also prone to corrosion when the pH of the anode increases (due to membrane pinholes, etc.) and when the levels of chlorates and hypochlorites are high. Personally, I think using only spot welding may slightly affect the electrode coating, after all it covers the electrode coating. However, due to its relatively small size, it can be basically ignored. For the welding of the electrode grids in the cell, in addition to ensuring strength, the main weld points should be free of roughness, as this can easily damage the membrane.
Professional,:handshake
Very professional: handshake