Galvanic corrosion between Ti Gr.2 and Duplex S31803
Galvanic corrosion between Ti Gr.2 and Duplex S31803
(OP)
Hey,
i'm trying to prove that there will be no galvanic corrosion between the materials mentioned in the thread title.
Looking at the galvanic table I see that Ti and Stainless steel are quite close. I don't see duplex beeing listen though.
Anyone here know the anodic index of Duplex S31803 steel? I have found that titaion has a AI = 0.30V, but am unable to find it for duplex.
Thank you
i'm trying to prove that there will be no galvanic corrosion between the materials mentioned in the thread title.
Looking at the galvanic table I see that Ti and Stainless steel are quite close. I don't see duplex beeing listen though.
Anyone here know the anodic index of Duplex S31803 steel? I have found that titaion has a AI = 0.30V, but am unable to find it for duplex.
Thank you





RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
- Relative ratio of the Areas of the two metals
- Electrolyte
As a reference for the potential of the two materials you can see :
"There is no major difference in corrosion potential between highly alloyed stainless steels and titanium."
http://www.outokumpu.com/pages/Page____26793.aspx
hope this help
S.
Corrosion Prevention & Corrosion Control
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
As for the relative ratio of areas, I'm not quite following.
If I am considering a bolt and a nut, would not the ratio then equal to 1?
Thank you
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
http://www.corrosion-club.com/galvanic.htm
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
If you have an electrolyte with low conductivity then the effect of galvanic corrosion are different.
there are many things to consider..........
Galvanic Corrosion
S.
Corrosion Prevention & Corrosion Control
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
Beware of using Ti coupled with duplex in nut/bolt combinations in marine environments. Crevice corrosion of the duplex stainless may result.
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
The published galvanic series is in FLOWING seawater. Stagnant crevice conditions are a more series situation.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
There is no major difference in corrosion potential between highly alloyed stainless steels and titanium. [http://www.outokumpu.com/pages/Page____26793.aspx]
I can't find duplex in the galvanic chart, nor can I find its Anodic Index, but I assume they are close to each other as long as duplex is passive.
But, because I am using Duplex as the nut, my construction will be prone to crevice attacks (stagnant seawater), and thus I have to look at the duplex as active. When in its active state, they are far apart in the galvanic chart and should not be used together.
Am I thinking right?
Thanks!
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
Another importatn factor is the operating temperature of you water.
See these graph from Outokumpu on Crevice behaviour of duplex and stainless steel. In my opinion you've to define exactly the temperature and cl- concentrations.
http://www.outokumpu.com/pages/Page____26793.aspx
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there is also a free software from NIDI to evaluate the possibility of crevice corrosion:
http
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S.
Corrosion Prevention & Corrosion Control
RE: Galvanic corrosion between Ti Gr.2 and Duplex S31803
Thank you very much for your time!