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Sacrifical Anode Performance for Dissimilar Metals in a non-submerged condition
3

Sacrifical Anode Performance for Dissimilar Metals in a non-submerged condition

Sacrifical Anode Performance for Dissimilar Metals in a non-submerged condition

(OP)
All,

I have encountered a condition where Steel and Bronze are physically touching in a humid and often times wet condition. This location is not frequently visible and is seldom observed (yearly to bi-yearly). Rusting has occurred on the steel and I have been tasked with providing recommendations for how to best move forward. Separating the two members is currently a last resort option, and as such I researched alternative methods on corrosion prevention and mitigation.

It appears to me that the use of a sacrificial anode assembly post cleaning and painting is a potential solution, however, I ask this forums expertise for the following items. This product provides an example of what I might recommend as a sacrificial anode assembly: http://www.performancemetals.com/anodes/AnodeProdu...

1) This assembly typically performs in a submerged state. This condition is not submerged, however it is conducive enough for corrosion. Am I correct in assuming that since the condition is producing a sufficient electrical connection for corrosion to occur it will also allow a sacrificial anode assembly to perform?

2) As a side note to 1, should this assembly be applied with a conductive glue/epoxy/adhesive?

3) Is there a relationship between proximity of sacrificial anode to protected anode and cathode, the environment and the material properties? (I.E. placing the assembly x inches away in a humid environment will be y% effective for the materials used)

4) Any "best practices" or "rules of thumbs" which you could share would be much appreciated.

Thank you for your time

RE: Sacrifical Anode Performance for Dissimilar Metals in a non-submerged condition

Just use the proper paints.
But in a sense that is CP, since the paints for steel contain Zn.
I would just contact coating companies and look at some good two or three layer coating systems.

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Plymouth Tube

RE: Sacrifical Anode Performance for Dissimilar Metals in a non-submerged condition

SJones- another LPS for posting that excellent reference, again. Now if only people would take a moment to actually read and understand it...!

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