Letter 34007

Crevice corrosion of Monel 400 in sea water [U.K.] 

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We have experienced quite severe corrosion of cast Monel 400 ball valves. The valves have been submerged in possibly polluted stagnant sea water for approx 2 years. On testing, the balls were found not to open because of corrosion at the contact with nylon/polythene? seats.

Does anyone have info on the likelihood of crevice corrosion of cast Monel or experience of this type of problem.

All assistance gratefully accepted.

Regards

Martin Rich
Ship Repair - Plymouth, Devon, UK

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