Galvanic Corrosion Potential
Galvanic Corrosion Potential
(OP)
I would like to assess the likelyhood of galvanic corrosion taking place between a High Alloy super duplex steel (Alloy 255) and a Grey Cast Iron in a marine environment. I understand that the galvanic potential is related to the "nobility" of the metals in question. However, I would just like to now if it may be a problem? and if so what measures I should take to mitigate the risk....many thanks in advance.....





RE: Galvanic Corrosion Potential
RE: Galvanic Corrosion Potential
RE: Galvanic Corrosion Potential
RE: Galvanic Corrosion Potential
I meant to use the word "isolate" rather than "insulate", but I think you understood. Stevenal has a good suggestion about cathodic protection. The more wetted surface area you can coat, the lower the required amperage for protection will be.
Also, be on the lookout for MIC caused by anerobic bacteria, esp. SRB's. They are REAL nasty.
RE: Galvanic Corrosion Potential
RE: Galvanic Corrosion Potential
What counts is the surface condition-active or passive. Passive surface SS (a thin Cr oxide layer) is VERY noble to grey cast iron-at least to the iron in it.
RE: Galvanic Corrosion Potential
Based on practical experience S/S can and does hookup with any thing in seawater. It maight take a little longer to start but it will.