Duplex S31254 with Inconel 625 in seawater application
Duplex S31254 with Inconel 625 in seawater application
(OP)
Hello,
I've been searching to fine the galvanic reaction between these two materials used in a flowing seawater application. The Duplex will have a very small exposed area and the Inconel will have a rather large exposed area, they are both in close contact with each other.
I have also been trying to place the Duplex on the galvanic series, any insight into that would be helpful as well. "Alloy 625" is clearly listed on most charts I have seen. For example: http://www.rowantechnology.com/wp-content/uploads/...
Please shed some light on this for me.
Thank You!
I've been searching to fine the galvanic reaction between these two materials used in a flowing seawater application. The Duplex will have a very small exposed area and the Inconel will have a rather large exposed area, they are both in close contact with each other.
I have also been trying to place the Duplex on the galvanic series, any insight into that would be helpful as well. "Alloy 625" is clearly listed on most charts I have seen. For example: http://www.rowantechnology.com/wp-content/uploads/...
Please shed some light on this for me.
Thank You!





RE: Duplex S31254 with Inconel 625 in seawater application
In a crevice corrosion situation the 625 may not be up to the task....
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Plymouth Tube
RE: Duplex S31254 with Inconel 625 in seawater application
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Duplex S31254 with Inconel 625 in seawater application
Of all of the various 6% Mo superaustenitic stainless grades S31254 is the least corrosion resistant.
N08367, N08925/26, and S32654 are all better alloys.
Steve, 22 has significantly better pitting resistance than 625. There have been many cases of 625 seals and flanges failing in seawater. I am not aware of any 22 (or 59 or 686) seawater failures.
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Plymouth Tube
RE: Duplex S31254 with Inconel 625 in seawater application
Please keep any comments coming.
RE: Duplex S31254 with Inconel 625 in seawater application
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Duplex S31254 with Inconel 625 in seawater application
Thanks again