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Galvanic Corrosion - Stainless Steel Rod with Carbon Steel Nut

Q. Will a carbon steel nut on a stainless steel rod act as an anode to help prevent the rod from corroding if they are submerged in seawater?

I read another similar post here that used an example of steel wool on a stainless steel sink causing it to rust. However, it seems that the carbon steel nut would act as a sacrificial anode and protect the rod. Is that not correct?

Thanks,

Craig

Craig Stewart
student - Winston-Salem, North Carolina
March 2, 2010

A. Interesting question, Craig. It's nice to see students thinking. Yes, a plain steel nut should serve as a sacrificial anode on a stainless steel rod, but probably not a very practical one because it's life would be short.

I think steel wool causes rusting of stainless steel by imbedding small particles of steel into it.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey

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