"contamination of stainless by mild steel"

Question:

"I said to a friend to put a stainless patch in part of his exhaust. He said the stainless would corrode. I replied that it would not. He cited that it would and that is the reason Stainless rots if you do not put in a rubber packing between stainless pipe and the support shoe. we generally use 316L grade stainless. I could not see how this could occur as I thought that it would be the shoe that would corrode. I can see the problem of contamination of a weld by mild steel grinding dust but not by simple metal to metal contact."

Answer:

Of the two components in intimate contact, the carbon steel would have a tendency to corrode. If your are referring to an external support shoe, there should not be a problem.

 

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