ABSTRACT
The effectiveness of Zn-anodes for long-term cathodic protection against the propagation of crevice corrosion in AISI316L pipe couplings in sea water was investigated. Corrosion potential measurements using mini-capillaries in simulated crevices, and testing of actual pipe couplings under wet/dry service conditions showed that Zn-anodes attached before testing prevent the initiation of crevice corrosion. Attachment after exposure stopped propagation of crevice corrosion for long periods of time, even when first attached after 1500 h of corrosion as well as under cyclic wet/dry loading over a 9 month period.
