Study of Localized Corrosion of AISI 430 and AISI 304 Batches Having Different Roughness

摘要: In this work, the localized corrosion resistance of different batches AISI 430 and 304 stainless steels, having Scotch-Brite surface finishing, was investigated as a function their roughness (in terms Rz) chemical composition. The study performed by recording anodic cyclic potentiodynamic polarization curves at room temperature in two NaCl solutions (0.35 1.75 wt %). From curves, potential (Ecorr), protection (Eprot), pitting (Epit) were obtained. general, results indicate that has better than 430, both initiation repassivation ability, independently from roughness. particular, an increase determined decrease Epit only case less concentrated solution. This result related to higher variability corresponding Rz values compared those 430. Finally, analysis loop hysteresis relation Epit−Eprot values, durability information on tested steels obtained: shows performances with respect thanks chromium content former latter.