Galvanic Corrosion question for the experts
Galvanic Corrosion question for the experts
(OP)
I have been asked to review the corrosion potential of a bolted joint. The fastener material is MP35N. This fastener is being used to bolt together two pieces of Monel K-500. The environment will be in seawater and the flow rates around the fastener head are likely to be very very low if any at all.
I have been reading a great deal and have come to the conclusion that MP35N is susceptible to Galvanic corrosion when used in the preceeding fassion. The question for me now is how much corrosion can I expect and over what time frame.
I am primarily a Mechanical Engineer and I have no background in Corrosion Engineering so I was wondering if someone more experienced could provide some insight or direction...
My Mechanical group really has no one experienced with corrosion either so I am alone with this.
any help would be appreciated...
Adam





RE: Galvanic Corrosion question for the experts
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Plymouth Tube
RE: Galvanic Corrosion question for the experts
I have pretty much come to the same conclusion as you - the two metals, although different, are very close on the galvanic series and thus shouldnt pose a problem...
any other opinions out there in the eng-tips world?
RE: Galvanic Corrosion question for the experts
Use a good quality marine paint to give the bolt/fastener extra protection
Offshore Engineering&Design
RE: Galvanic Corrosion question for the experts
RE: Galvanic Corrosion question for the experts
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Plymouth Tube
RE: Galvanic Corrosion question for the experts
I have found in MIL-STD-889B Notice 3 that Nickel-Copper and Nickel-Cobalt alloys are incompatible in a seawater environment anyhow.
I'm going to have to look at different alloys with mechanical properties close to MP35N.
Thanks for the help everyone!