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Localized corrosion properties of low interstitial ferritic, high purity austenitic and high chromium duplex stainless steels
Author(s) -
Sinigaglia D.,
Rondelli G.,
Taccani G.,
Vicentini B.,
Dallaspezia G.,
Galelli L.,
Bazzoni B.
Publication year - 1980
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.19800311103
Subject(s) - materials science , metallurgy , crevice corrosion , austenite , chromium , austenitic stainless steel , corrosion , pitting corrosion , nickel , microstructure
Within the framework of a research aimed at characterizing the behaviour of new materials to pitting and crevice corrosion, an investigation has been made, using electrochemical techniques, of the following materials: ELI ferritic stainless steels (18 Cr‐2 Mo‐Ti; 21 Cr‐3 Mo‐Ti; 26 Cr‐1 Mo); high chromium duplex stainless steel (Z 5 CNDU 21‐08) and high chromium‐nickel austenitic stainless steel (Z 2 CNDU 25‐20); commercial austenitic stainless steels (AISI 304 L and 316 L) and laboratory heats of austenitic stainless steels with low contents of interstitials (LTM/18 Cr‐ 12 Ni, LTM/16 Cr‐ 14 Ni‐2 Mo). It was possible to graduate a scale of resistance to pitting and crevice corrosion in neutral chloride solutions at 40 C; in particular the two experimental austenitic stainless steels LTM/18 Cr‐ 12 Ni and LTM/16 Cr‐ 14 Ni‐2 Mo are at the same level as the AISI 316 L and 18 Cr‐2 Mo‐Ti, respectively. An occluded cell was developed and used for determining the critical potential for crevice corrosion (E localized corrosion ). For the steels under investigation E localized corrosion is less noble than E pitting especially for ELI ferritic 18 Cr‐2 Mo‐Ti and 21 Cr–3 Mo‐Ti.