Magnetic and Electrochemical Techniques as Tools to Detect Deleterious Phases in Duplex Stainless Steels

Abstract

The development of techniques to detect deleterious phases in duplex and super duplex stainless steel has a great technicalscientific appeal. However, establishing a quality control of these steels using a unique technique of inspection requires an attentive analysis about its limits and sensibility of detections. Thus, the current work compares magnetic techniques based on eddy current methods and electrochemical potentiokinetic reactivation with double loop to detect deleterious phases in duplex stainless steel. The limitations and advantages of each technique are discussed mainly concerning the viability to detect sigma phase and chromium nitride. KEY WORDS: cyclic voltammetry, duplex stainless steel, sigma phase ISSN 0010-9312 (print), 1938-159X (online) 15/000141/$5.00+$0.50/0 © 2015, NACE International