Corrosion of the cathode outlet hose gasket
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Two years after operation, when replacing the small gaskets on the hoses in an ion membrane electrolyzer, it was found that corrosion at the cathode outlet was quite severe. Let’s discuss together the causes of this corrosion and the preventive measures. :handshake Last edited by limingshuguang on 2007-12-18 08:47 ]
Is there a problem with the material of the gasket, and what is its service life?
It’s probably a problem with the material of the gasket. Quality issues exist everywhere, and the original Japanese versions are no exception: lol
One cannot fully trust the product quality of Japanese products either. It could also be cheap foreign products purchased by the Japanese side.
In addition to the reasons mentioned above, another possible cause of gap corrosion could be problems with the sacrificial electrodes at the anode and cathode outlets; it’s not clear what type of electrolyzer LZ Company uses, as different electrolyzers have different requirements for sacrificial electrodes.
I also think it’s a problem with the quality of the gaskets, because in the early days Japan required EPDM rubber (I believe it’s ethylene propylene diene monomer rubber) for the anode and neoprene rubber for the cathode. Since they are all black and difficult to distinguish, a method of using higher grades in place of lower ones is adopted, with EPDM gaskets being used in all cases. Even the good gaskets get corroded; it’s likely that there is an issue with the formula or the adhesive. There are many people in China who manufacture gaskets; some cut corners to reduce costs, which has led to quality issues. :P
As a supplementary point, gasket corrosion is a type of chemical corrosion caused by high temperatures and high alkalinity; since rubber does not conduct electricity, there is no corrosion resulting from leakage currents. Gap corrosion is a form of metal corrosion that occurs in the gaps between metal crystals. Therefore, rubber corrosion has nothing to do with the electrolytic cell or sacrificial electrodes.