Corrosion between 2 different materials

[VikasP]

Hi,
The piping material is duplex steel however nuts, bolts & washers are in stainless steel 304 or 316 grade. Is there any chance of galvanic or any other corrosion between duplex steel flanges & stainless steel nut bolts?
Thanks for reply

 

[Latexman]

What’s the potential difference on the galvanic emf chart/list?

Good Luck,
Latexman

 

[Dhurjati Sen]

What is the intended life of the nuts, bolts and washers?

DHURJATI SEN
Kolkata, India

 

[EdStainless]

Will these materials be wet?
will that water be highly conductive?
What is the max temperature?

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P.E. Metallurgy, consulting work welcomed

 

[TugboatEng]

Leakage should also be considered. Depending on fluid if a leak develops, even a miniscule one, it can lead to stress corrosion cracking of the fasteners which can result it catastrophic failure of the connection. Is this risk tolerable?

 

[Opensource]

Hi

What is the Duplex steel type ? Chemical composition ?
What is the service ?
Project conditions ?
Why is that you are using bolts & washers are in stainless steel 304 or 316 grade and not other type of materials ?

 

[EdStainless]

Either use matching duplex fasteners or use fluoropolymer coated steel fasteners.

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P.E. Metallurgy, consulting work welcomed