Gavonized Corrosion between copper alloy and ss316, duplex
Gavonized Corrosion between copper alloy and ss316, duplex
(OP)
Hi Experts,
Condition: Pressure vessel and Sea water service.
The flange material: SB-283 C70620.
The bolt materials: SS316 or duplex/supper duplex or Monel.
Question: will it be gavonized corrosion between SB-283 C70620 and SS316 or duplex/supper duplex or Monel.
Thanks,
Condition: Pressure vessel and Sea water service.
The flange material: SB-283 C70620.
The bolt materials: SS316 or duplex/supper duplex or Monel.
Question: will it be gavonized corrosion between SB-283 C70620 and SS316 or duplex/supper duplex or Monel.
Thanks,
RE: Gavonized Corrosion between copper alloy and ss316, duplex
Yes the Monel is more noble but not by a huge amount.
316 or 2205 will not survive very long in seawater.
Superduplex is asking for issues.
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P.E. Metallurgy, consulting work welcomed
RE: Gavonized Corrosion between copper alloy and ss316, duplex
These dissimilar couplings can work provided your anodes never wear out. Once the anodes are gone the system will fail rapidly.
RE: Gavonized Corrosion between copper alloy and ss316, duplex
How about Incinel, SB-446 UNS NO6625 Gr.1 for sea water service and againt the gavonized corrosion with SB-283 C70620?
Thanks,
RE: Gavonized Corrosion between copper alloy and ss316, duplex
So going to 625 hardware would be even worse.
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P.E. Metallurgy, consulting work welcomed
RE: Gavonized Corrosion between copper alloy and ss316, duplex
RE: Gavonized Corrosion between copper alloy and ss316, duplex
Once corrosion starts the SS is no longer passive.
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P.E. Metallurgy, consulting work welcomed
RE: Gavonized Corrosion between copper alloy and ss316, duplex
Once corrosion starts the SS is no longer passive is certainly true when that applies to corrosion of the SS. Copper alloys near SS are anodic and prevent that corrosion of the SS from starting.
RE: Gavonized Corrosion between copper alloy and ss316, duplex
A potential difference of 0.25V is plenty to drive accelerated corrosion in warm water, it will take a bit more in colder water.
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P.E. Metallurgy, consulting work welcomed
RE: Gavonized Corrosion between copper alloy and ss316, duplex
Steve Jones
Corrosion Management Consultant
www.linkedin.com/in/drstevejones
All answers are personal opinions only and are in no way connected with any employer.
RE: Gavonized Corrosion between copper alloy and ss316, duplex
@SJones, the whole floating head soak in the sea water.