Corrosion Behaviour of Manganese-Containing Stainless Steels. II. Potentiodynamic measurements in H2SO4 solutions

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

• Publisher: John Wiley and Sons
• Year: 1973
• Tongue: German
• Weight: 585 KB
• Volume: 24
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.19730240106

✦ Synopsis

Abstract

The behaviour of steels with (%) 17.3 Cr, 5.3 Ni, 0.3–13.9 Mn during potentiodynamic polarization k tests is comparable to that of 18 8 CrNi steels. Sharp peaks are found in the polarization curves; they correspond to the dissolution of the iron base: This region is followed by a passive zone characterized by low and potential‐independent current flow. At a certain potential, however, a steep current rise sets in. In diluted acid there is even a transpassivity zone corresponding to the dissolution of Cr and Mn. The beginning of this zone corresponds to the beginning of the steep current rise in more concentrated solution. Cyclic cathodic reduction and anodic oxidation results in a considerable reduction of the height of the peaks in the active region, while this treatment has no effect on the transpassive region. The optimum composition of a steel would be (%) 17.3 Cr, 5.3 Ni, 5.6 Mn; higher Mn contents deteriorate the corrosion behaviour.