Crevice corrosion of grades 2101 and 2205 duplex stainless steel in seawater environment

Aoki, So  ; Engelberg, D.*

The occurrence of localised corrosion (e.g. crevice, pitting) is still a major concern for the application of lean (grade 2101) and standard (grade 2205) duplex stainless steels in seawater environments. This presentation will address recent progress in providing a mechanistic understanding of the effect of microstructure that can lead to the nucleation of localized corrosion, and typical examples of ex- and in-situ corrosion experiments under electro-chemical control are provided. Both duplex stainless steel grades are assessed for their susceptibility to seawater crevice corrosion, with the effect of crevices nucleating around weld microstructure and heat affected zones (HAZ) discussed.