Abstract
Stainless steels usually suffer localized corrosion, such as pitting and crevice corrosion, in chloride containing oxidizing environments. Their corrosion resistance depends on materials chemical composition, microstructure, heat treatment, surface finishing, and also on environment character (composition of electrolyte, temperature, pH, flow, etc.). The subject of the work is investigation of mechanical (grinding) and combined (grinding + pickling) surface treatment effect on corrosion behavior of stainless steel AISI 316Ti. The selected properties of surfaces are determined including surface roughness, surface-free energy, topography (by atomic force microscopy) and chemical composition using scanning electron microscopy. Corrosion susceptibility of the specimens with ground or ground and pickled surfaces to local corrosion has been studied by the three types of corrosion tests (exposure test, potentiodynamic polarization, and electrochemical impedance spectroscopy). The experiments enable not only to compare corrosion resistance after different surface treatment, but to follow response of the surface state on corrosion mechanism of the different experimental methods.
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