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

2021; Elsevier BV; Volume: 127; Linguagem: Inglês

10.1016/j.engfailanal.2021.105524

1873-1961

Caio Vinícius Leão Sabará, Lucas Nascimento Santana Prachedes, Luan Carrera Santos, Marco Antônio Sabará, Rhuan Costa Souza, A.F. Sene, Lecino Caldeira, Gustavo L. Vaz, Jefferson Rodrigues de Oliveira, José Antônio da Cunha Ponciano Gomes, Alysson Helton Santos Bueno,

Welding Techniques and Residual Stresses

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 2-S13Cr, 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.