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Galvanic Corrosion of Brass Tubesheet

Galvanic Corrosion of Brass Tubesheet

Galvanic Corrosion of Brass Tubesheet

(OP)
We have a brass exchanger tubesheet with Monel tubes.  The brass tubesheet is failing in a manner that I haven't seen before.  The brass is coming off in a "stringy" type fashion instead of pitting or cracking.  Is this common in brass ?  Is this typical of brass/monel galvanic corrosion ?

RE: Galvanic Corrosion of Brass Tubesheet

brass with more than 15% zinc and without tin undergo dezicification. The less corrosion resistant zinc is lost leaving a porous network of copper. see the Metals Handbook, desk edition page 7.36 for explanation and solutions.

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