Galvanic corrosion of cladded components

[kevlar49]

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).

 

[SJones]

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/

 

[kevlar49]

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?

 

[EdStainless]

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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