Corrosion behaviour of sintered ferrous alloys and Ferro-TiC in H₂SO₄and NaCl solutions

Abstract

The room temperature corrosion behaviour of plain carbon steel Fe-0.5C, low alloy steel Fe-5Cu-0.5C, tool steels ASP 23 and ASP 30, and ferro-TiC cermet was investigated in H₂SO₄ (0.1-5<i>N</i>) and 0.6 <i>N</i> NaCl solutions by potentiodynamic polarization technique. The study also includes X-ray diffraction, optical microscopy and scanning electron microscopy of the as-received as well as corroded surfaces. Porosities present in Fe-0.5C and Fe-5Cu-0.5C steels were found to be responsible for their poor corrosion resistance. ASP 30 steels were found to exhibit good corrosion resistance as compared to ASP 23 in both the media.