Electrolyzer pinhole test
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This post was last edited by sunjl1981 on 2013-1-6 at 23:48. Our company uses chlorine engineering cells; when conducting pinhole tests, two results occur: one is that after the cell stops operating and cools down, a pinhole test is performed and no pinholes are found in the membrane. Secondly, after cooling the cell and rinsing it with pure water before conducting the test, pinholes were found on the membrane. What is the reason for this? This post was last edited by limingshuguang on 2008-1-3 21:51. ] # ， ， &
Mainly, under different conditions, the shrinkage rate of the membrane varies, resulting in different outcomes. However, what happened to us was the opposite of what the original poster experienced: there were pinholes during testing on the cell, but they disappeared after rinsing. With Japanese electrolytic cells and ion membranes, pinholes cannot be detected in the later stages, but analysis of production parameters shows that they are present. Later on, more manufacturers simply replaced the membrane to solve such problems.
After the electrolytic cell was stopped, a pinhole test was attempted directly; however, impurities and precipitates adhered to the membrane, which prevented the formation of pinholes. After washing the membrane, the precipitates on it dissolved and the impurities were removed, allowing pinholes to appear on the membrane. That’s why pinholes were observed during the airtightness test.
As mentioned in the comment from the 3rd floor, pinholes appear after the impurities attached to the surface of the membrane are washed away by pure water! The shrinkage rate of the membrane should have nothing to do with your reasons!
Different temperatures result in different contraction rates. There is also the issue of salt crystallization, or impurities, which may end up blocking the needle holes
I think it’s impurities that adhere to the needle holes; after washing, those impurities are removed, resulting in the formation of needle holes. This post was last edited by limingshuguang on 2008-1-3 at 21:52.]