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Galvanic corrosion of cladded components

Galvanic corrosion of cladded components

Galvanic corrosion of cladded components

(OP)
Is is likely that galvanic corrosion  at the interface between cladding and carbon steel will occur in an aqueous, highly acidic environment with nickel-based cladding (e.g. Incoloy 825, Inconel 625) but not with stainless steel (e.g. 304/316 etc).

RE: Galvanic corrosion of cladded components

The interface shouldn't be exposed surely; wouldn't it defeat the object of cladding?  Bimetallic corrosion will occur with both stainless and nickel alloys.

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: Galvanic corrosion of cladded components

(OP)
I was thinking in terms of where the spec break occurs.  I have seen partial cladding/stripling with 300-series stainless steel in an acid dew point corrosion environment, but no preferential corrosion at athe interface.  I cannot say the same for at the interface of nickel-based cladding.

Any observations?

RE: Galvanic corrosion of cladded components

If there is attack at the interface I would question the quality of the cladding.  There is no crevice there.  If the fabrication is done correctly there should be no edge exposure.  The units I recall had weld overlay on edges.

Just based on gavanic potentials they should both corrode.  Your acid condensation issue does not rely on galvanic potential, just metal disolution rates.

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