Fig. 4: Corrosion performance of the of the developed steels measured by immersion tests.

a, b Weight loss and c, d corrosion rate plotted as functions of the immersion time for the a, c 13Cr and b, d 16Cr steels in the 0.5 M H₂SO₄ solution. e SEM images of the 13Cr and 16Cr steels heat treated at different temperatures after the 7-h immersion.