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Electrochemical corrosion behavior of LDX 2101® duplex stainless steel in a fluoride‐containing environment
Author(s) -
Rosalbino Francesco,
Scavino Giorgio,
Ubertalli Graziano
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202011826
Subject(s) - materials science , passivation , corrosion , dielectric spectroscopy , fluoride , open circuit voltage , metallurgy , austenite , oxide , electrochemistry , austenitic stainless steel , metal , composite material , inorganic chemistry , electrode , layer (electronics) , chemistry , voltage , microstructure , physics , quantum mechanics
The effect of fluoride on the electrochemical corrosion behavior of an LDX 2101® duplex stainless steel (DSS) was studied. Open‐circuit potential ( E OC ) and electrochemical impedance spectroscopy (EIS) measurements were carried out in artificial saliva and with the addition of fluoride (1 wt% NaF). The electrochemical corrosion behavior of the AISI 316L austenitic stainless steel (SS) was also evaluated for comparison. Both open‐circuit potential and EIS results indicate that DSS and austenitic SS undergo spontaneous passivation due to spontaneously formed oxide film passivating the metallic surface, in the simulated aggressive environments. However, LDX 2101® exhibits superior corrosion resistance as compared with AISI 316L, and this improvement is ascribed to the formation of a passive film which shows a higher protective effect than the one formed on AISI 316L.