IIRC COT-TEN was developed for railroad hopper cars, where they couldn't keep paint on them. It sort of self-repairs as is wears.
Left alone to weather, it spalls large, thin flakes like de-laminating wafer-board.
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I've looked around the web and came up empty.
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What did you use for search terms? I think of
cathodic protection, but that possibly relies on being immersed in water.
Edit: According to
https://en.wikipedia.org/wiki/Cathod...on#Automobiles people who try this get sued by the FTC.
But aluminum is a suitable sacrificial anode. So I'm suspicious. Probably has to do with pulsed DC (DC bias imposed on AC) at some harmonic frequency.
