Post 474907 (https://www.thevespiary.org/talk/index.php?topic=12548.msg47490700#msg47490700)
(lugh: "Reference Articles: Overvoltage + Al couples", Serious Chemistry) will fill in the gaps:(https://www.thevespiary.org/rhodium/Rhodium/hive/hiveboard/picproxie_imgs/djvu.gif)