Bi Metallic Corrosion: Can Galvanic Isolators Help?

Galvanic corrosion and pitting/crevice corrosion will be more likely issues if temperature and humidity cycling are present. the less noble metal(mild steel) will be attacked by the other. but If humidity is controlled in shed will be less issue than if humidity cycles from high to low over periodic useage cycles. At 1200 degrees and distilling wood you are creating a reducing environment, and Stainless loves Oxygen to form passive film. So I am concerned that all that excess carbon could lead to carburization embrittlement of the stainless- the excess carbon in combination with reducing atmosphere- diffuses rapidly into the material along grain boundaries. This is commonly referred to as metal dusting. this can happen even at relatively low temperatures- say 400-800 C. HAve you seen this occur?

When you say for purely commercial reasons, you do mean the accountants and price...

milo

Yes i will like to know the possibility of galvanic corrosion in a controlled environment

Predict the effect of Galvanic Corrosion is not so easy, it depends on many factor. You firstly need to have an electrolitic paths beetwen the two metals in order to have Corrosion, sea-water, condensing humidity from atmosphere etc etc.

The amount of corrosion depends on the difference of potential in the electrochemical series in that partilular environments, sea water is different from natural water, and also on the ratio of the area of the two materials exposed.

There are table that allow you to have an idea of the possibility to have Galvanic corrosion in atmosphere or sea-water.

For what i've understood if your bimetallic interface is exposed to a controlled environments, no rain, low humidity, i don't see the possibility to have a Galvanic Corrosion.

But this is just a first impression it will be necessary to have more information to give a reliable prediction.

Hope this help

Vict