Abstract
The quantification of intermetallic phases (σ, χ and Cr2N, mainly) and the influence on susceptibility to localized corrosion of super duplex stainless steels have a strong scientific and practical appeal. Mainly enable the reduction of costs in terms of unwanted stops, preventing failures of equipment and facilitate the estimated of remaining life of a component whose corrosive process is an imminent risk. Currently, the techniques of electrochemical potentiodynamic reactivation with double loop (DL-EPR, following the ISO 12732) and eddy current (EC) are presented as potentials tools for characterization of the susceptibility to localized corrosion of stainless steels. The application of these techniques in welded joints of stainless steels is a technical challenge, which basically involves the development of a methodology where aspects related to the limits of detection and characterization needs to be better analyzed. In this sense, this paper presents a comparison between techniques of DL-EPR and EC to quantification of intermetallic deleterious phases in super duplex stainless steel (UNS S32750) under different isothermal treatments (annealing and aging).
