Influence of parameters related to microstructure, chemical composition and environment characteristics on localized corrosion failure susceptibility of supermartensitic stainless steels

This work investigates the parameters that influence pitting resistance of UNS S41426 martensitic stainless steels. Chemical composition, microstructure, acceptable service temperature, chloride concentration, aeration conditions and pH are considered. Electrochemical techniques were used to assess the localized corrosion of two supermartensitic 13Cr stainless steels in compliance with the same classification standard, at different solution conditions, chloride concentration and temperatures. The results clearly showed higher pitting corrosion resistance for the material 2S13Cr, which is probably related to the concentration of some alloying elements, such as Cr and Mo. Temperature and chloride concentration increment contributed to pitting corrosion failure, as expected.

Automated summary

This study investigates the parameters influencing the pitting resistance of martensitic stainless steels, specifically focusing on the chemical composition, microstructure, service temperature, chloride concentration, aeration conditions, and pH. Electrochemical techniques were used to assess the localized corrosion of two supermartensitic 13Cr stainless steels under different solution conditions, with the results showing higher pitting corrosion resistance for material 2S13Cr. Temperature and chloride concentration increment were found to contribute to pitting corrosion failure.