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      10-03-2021, 01:19 PM   #705
Biginboca's Avatar

Drives: 2009 E92 328i 6MT
Join Date: Jun 2017
Location: Boynton Beach, FL... USA

iTrader: (3)

Originally Posted by PhaseP View Post
In terms of galvanic corrosion with magnesium, Titanium is worse than steel or stainless steel. The closer the two metals in contact in this chart the less galvanic corrosion will happen. And titanium and magnesium is very apart from each other (about 1.5 volt difference between the too):

For galvanic corrosion to happen there has to be electrolyte solution between two dissimilar metals. Road salt mixed with rain, snow slush is one.
Because the bolt heads are pointing down in this case, the salted water will drain won't not stay. Also there is aluminum between the magnesium and the bolt's exposed head with these covers. That may be reducing the effect too.
The stainless steel bolts may have some plating on them that would reduce the contact and also corrosion as well, but it is not specified.

Overall it is better to use aluminum bolt, I think.
Thanks for that. I ordered a couple different aluminum bolts to try, the oem bmw ones (50mm) posted on the last page that would need some modification to work, and the 40mm ones I posted also. Definitely going to use aluminum bolts.
Appreciate 0