TITLE:
Characterization and Corrosion Behaviour of Selected Duplex Stainless Steels in Acidic and Acidic-Chloride Solution
AUTHORS:
Oluwatoyin Adenike Olaseinde, Joasias Van der Merwe, Lesley Cornish
KEYWORDS:
Duplex Stainless Steels; Potentiodynamic Tests; Characterization
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.4 No.1,
January
27,
2014
ABSTRACT: The 2101, 2205 and 2507 are duplex stainless steels. They have two phases: austenite and ferrite. The metallurgical
characterization was performed by means of Scanning Electron Microscopy (SEM)
with EDX and X-ray diffractometry (XRD). The corrosion behaviour was evaluated by potentiodynamic tests. The
corrosion tests were conducted with the aid of potentiostat. The SEM and XRD
revealed phases of austenite and ferrite without any intermetallic phase. The
elemental analysis of the phases showed that the elements partitioned more into
the phases that they promoted. The corrosion resistance of
2507 was higher than 2205 and 2101 as it may be seen on the polarization
curves. Comparing the two media, the following relation to their corrosion
resistance: 2507 > 2205 > 2101 was established.