Corrosion Behavior of Stainless Steel in Seawater in the Presence of Sulfide

The effect of temperature (from 288 to 308 K) and concentration sulfide ions (up 40 ppm) on the corrosion behavior AISI 304L 316L stainless steels in seawater was studied with measurements open-circuit potential, linear potentiodynamic polarization, electrochemical impedance spectroscopy. An increase pollutant negatively affects stability at open circuit (the resistance, compactness, thickness surface layer decrease current increases), passive region passivation increases, depassivation potential decreases, narrows), transpassive rate metal dissolution increases). occurrence pitting samples confirmed optical microscopy a non-contact 3D profilometer. A few large pits (depth 80–100 μm width 100 μm) were formed steel, while several smaller 40–50 50 steel. With increasing ion concentration, width, depth, density increased both steel samples. In range ions, exhibited higher resistance. Overall, influence more pronounced than temperature.