Dissimilar metal corrosion?

[Greenknight12]

Maybe I'm overthinking this with what I know about mechanical systems from the navy, however I'm picking up a full titanium catless downpipe today and was wondering if that would cause any corrosion to other exhaust components due to dissimilar metals.

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[Greenknight12]

Edit: Everything else on the car is completely stock.

 

[CrushA90]

????????Had to be a Navy guy.?

 

[Cptnslo]

No

 

[puzzled]

The flange usually has replaceable gaskets and the entire exhaust hangs on rubber hangers.. the only other metal contact I could think of are the nuts and bolts and those can be replaced, I believe.. so nothing permanent to worry about?

 

[lucky phil]

Dissimilar metal corrosion issues are only a factor if you have a conductive medium between the 2 metals such as salt water etc to create the electrolysis action. So I'm building an engine at the moment and one of the rolling element bearings I'll be using in the aluminium housing I'll be copper plating the outer surface because the housing hole is slightly oversize instead of using something like loctite bearing mount. I'm not concerned about the copper on the aluminium because it's inside the engine without any conductive medium between the two metals to generate the electrolytic action.

Phil

 

[ShakaDaKine]

Regarding the DP and exhaust system, you'd want to make sure all of the fasteners are of the same type of material to avoid galvanic corrosion. If you live where the roads are salted during the winter months, or near the beach, you would want to avoid a situation where carbon steel or aluminum is used alongside stainless steel (piping/fasteners).

 

[concept]

Salted roads can destroy steel fasteners, for sure. When I was working with oceanographic instruments with polyurethane housings, all external fasteners were made of commercial-grade titanium. Stainless steel fasteners would rust in anaerobic areas, like under the bolt heads and washers.
Of course, when I lived on the East Coast, I always had a "sacrificial" crasher car to drive on salted roads.

 

[razorlab]

The flange usually has replaceable gaskets and the entire exhaust hangs on rubber hangers.. the only other metal contact I could think of are the nuts and bolts and those can be replaced, I believe.. so nothing permanent to worry about?

The downpipe does not use rubber hangers. It's metal to metal to the turbo, metal to metal on the block to downpipe bracket and metal to metal where it mates to the catback.

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