Corrosion Behavior of Super-Ferritic Stainless Steels in NaCl Media

RAÚL B. REBAK; NATALIA SILVINA ZADOROZNE; ALICIA ARES; JORGE VIER

Congreso; TMS 2017; 2017

Recent worldwide demand hasdriven nickel and molybdenum prices to record high values. Alloys containingsignificant amounts of nickel and molybdenum, such as the austenitic and duplexgrades, have experienced significant price increases and some spot shortageshave resulted in some regions. With low or no nickel content and reasonablemolybdenum content, super-ferritic stainless steels are now proving to be themost cost effective corrosion resistant materials.  The electrochemical behaviorAPTM® (Fe?21Cr?5Al?3Mo?0.04C) and 4C54®(Fe?26.5Cr?0.8Mn-0.5Si) super-ferritic stainless steel in NaCl solutions hasbeen studied using open circuit potential measurements, potentiodynamicpolarization curves, and electrochemical impedance spectroscopy. The aim is tocompare the behavior of these materials with austenitic stainless steel alloy316 (Fe-18Cr-10Ni-2.5Mo). The results indicatethat the APTM alloy presents a better performance than the AISI 316 stainlesssteel, while 4C54® does not, especially at anodic potentials. Thegood behavior of APMT® may be attributed to Al and Mo content in itscomposition