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Pitting corrosion - magnesium

Posted: Fri Apr 13, 2018 7:57 am
by gturner008
Not a Porsche, but on my 66 VW bus, I have some deep pitting corrosion that’s happened on the bottom of the gearbox casing. It’s not gone through completely, and the case still holds tight, but I wondered if anyone seem this on Porsche magnesium castings?

It does not look like the corrosion has been active for a long time. I’m guessing caused by an alkaline mud that adhere to the casing. Any better ideas?