Corrosion Behaviour of Manganese-Containing Stainless Steels. III. Their susceptibility towards pitting corrosion

✍ Scribed by A. M. Shams El Din; M. M. Badran; S. E. Khalil

• Publisher: John Wiley and Sons
• Year: 1973
• Tongue: German
• Weight: 452 KB
• Volume: 24
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.19730240407

✦ Synopsis

Abstract

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.