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Corrosion Behaviour of Manganese‐Containing Stainless Steels. III. Their susceptibility towards pitting corrosion
Author(s) -
El Din A. M. Shams,
Badran M. M.,
Khalil S. E.
Publication year - 1973
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.19730240407
Subject(s) - passivation , pitting corrosion , corrosion , manganese , materials science , metallurgy , chloride , dissolution , polarization (electrochemistry) , alloy , cathodic protection , anode , electrode , chemistry , composite material , layer (electronics)
The pitting susceptibility of stainless steels with (%) 17.39 Cr, 5.3 Ni, 0.3–13.9 Mn in chloride solutions have been studied by a potentiodynamic cyclic polarization technique in solutions 0.1 N H 2 SO 4 + 0.9 N Na 2 So 4 + various amounts of NaCl. At low NaCl concentrations no pronounced influence of the chloride can be found and even at medium concentrations the passivation behaviour is generally maintained; in this region, however, there is an increase of dissolution and passivation current densities. High chloride concentrations, however, result in pitting which may be completely suppressed by a cyclic (anodic/cathodic) polarization technique. As to pitting resistance an alloy containing (%) 17.3 Cr, 5.3 Ni, 5.6 Mn is comparable to the steel CrNi 18 9.