Electrode Potential Difference of 625 and SDSS

[fujit]

We are considering coupling a 625 overlayed flange to a SDSS flange and want to know the electrode potential difference between the 625 and SDSS. I am looking for a reference for the EP values of the two metals for review and to keep as a record.

 

[rustbuster]

matweb.com

 

[EdStainless]

They are so close that I don't see that being an issue.
You do know that the 625 has a lower resistance to crevice corrosion than most SDSS grades, that is what I would worry about.

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Plymouth Tube

 

[fujit]

I know from past reports that the EPs are close for these materials but I would like to have a reference to use in support of our suggestion for the 625 clad.

 

[EdStainless]

Look at a traditional seawater galvanic series. All highly alloyed SS and Ni grades fall within a 0.100V range at one end. In order to get this level of corrosion resistance you need a similar corrosion potential.

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Plymouth Tube