Timeline for Why do positive terminals on DC devices exposed to water corrode more than negative terminals?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Oct 1, 2020 at 16:21 | comment | added | Chris Stratton | You've got the migration issue backwards, metallic ions are positive ions so in an aqueous solution they migrate from anode to cathode. Unlike in a wire, the charge carriers in solution are not exclusively electrons, but rather also electron-deficient ions. In electroplating, the object to be plated is the cathode; in electrolytic protection, we speak of the "sacrificial" zinc anode. | |
| Oct 1, 2020 at 16:05 | comment | added | schnedan | PS: the Car ECU used a Gore-Tex membrane to get moisture out, but not in (which wasn't enough in that one case...) | |
| Oct 1, 2020 at 16:04 | comment | added | schnedan | hmm, high air moisture and/or condensation water might support creeping currents - saw once a Car ECU blown up by this... | |
| Oct 1, 2020 at 15:26 | comment | added | Camilo Rada | Good points, but this can not be the whole story. In particular the batteries of the picture where in a storage container when them accidentally got underwater (a storm turned our storage area in a pond), so there were not connected to anything. | |
| Oct 1, 2020 at 8:00 | history | answered | schnedan | CC BY-SA 4.0 |