Abstract
The radial (depth) and lateral (length) corrosion propagation behavior of 316LN stainless steel, 2101 LDX duplex stainless steel, and MMFX-2 compared to plain carbon steel were characterized in saturated Ca(OH)2 with NaCl additions. Radial pit growth was ohmically controlled for all materials but repassivated more readily at high potentials in the case of 316LN and 2101 LDX stainless steels. Conversely, pit growth on carbon steel propagated at all applied anodic potentials and did not repassivate until deactivation by cathodic polarization. Stainless steel showed the highest resistance to lateral corrosion propagation from an active site during microelectrode array testing. In contrast, carbon steel was found to easily undergo widespread depassivation along the surface compared to stainless steel. 2101 LDX duplex stainless and MMFX-2 showed similar radial propagation behavior and corrosion morphology, which was intermediate between carbon steel and 300 series type stainless steel.
Published Version
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