Crevice corrosion of carbamate pump cylinders

Intensive crevice cor ros ion occurs under rubber gaskets in the valve chambers of carbamate pump cylinders made of austenitic steels 10Kh17N13M3T, 08Khl7N15M3T, and Kh17N13M3B, which frequently causes failure of the seal . Examination of fourteen cylinders made Of austenitic steels af ter 2500-6100 h of operation showed cor ros ion in the intake valve chamber in a band 2 mm wide around the c i rcumference (the diameter of the gasket was 6 mm), the depth of the attack reaching 2 mm. The width of the corroded band in the valve chamber on the discharge side was ~3 mm, with a depth of 1 .5 mm.