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The aim of this study was to investigate and compare the relationship between corrosion resistance and roughness in the samples of carbon steel SAE 1020 and DOMEX® 700 MC steel. Surfaces with different roughnesses were compared. The metal alloys were analyzed via electrochemical impedance spectroscopy (EIS), anodic potentiodynamic polarization (APP), roughness tester and scanning electron microscopy (SEM). It was observed that the samples exhibited different behavior with respect to corrosion resistance, according to the surface conditions and materials that were tested. The lowest roughness values represented the best results in the electrochemical tests. The samples of carbon steel with lower maximum depth of valleys (Rv) showed the best protection properties compared to other samples.

This investigation reports the results of linear polarization of hot upset Ti-6Al-7Nb bar samples. Current-potential curves recorded in Hank’s solution were analyzed by correlating characteristics of passivation and microstructures obtained after processing. Results have shown that it is important to select temperature process and deformation rate as parameters when more noble potential values are required. Low deformation rate facilitates the formation of beta phase that is retained in the structure at room temperature shifting the corrosion potential to more positive values. However, samples hot compressed from 750°C to 1030 °C showed passive layer stability over a wide range of potentials extending from -0.15 V to 1.75 V vs SCE . Furthermore, passive films grown onto the Ti-6Al-7Nb samples surfaces have shown no sign of rupture for the processing conditions selected for this study

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