Investigation Of Alkaline Solution Temperature Increment Influence Onto SS316L Surface

This study deals with the electrochemical behaviors of SS316L at various temperatures in a 3M KOH solution. The mounted SS316L was subjected to electrochemical measurement using a Potentiostat with an exposure area of 1 cm². Following electrochemical measurements, the samples were analyzed with a Scanning electron microscope equipped with Energy dispersive spectroscopy (SEM-EDS) to observe the surface morphology and element distribution. Identifying the phases present in the samples is done through X-ray diffraction (XRD). On the basis of SEM images, the surface roughness was also examined. According to OCP investigations, only the lowest solution temperature sample (30 °C) show that they are moving forward in a positive direction. Shifting to a higher solution temperature (from 30 to 50 °C) led to an increase in passive current density according to LSV oxidation measurement. The lowest solution temperature sample (30 °C) shows the lowest corrosion rate and a higher capacitive arc. In contrast, higher hydrogen production is seen in the highest solution temperature sample (50 °C). Moreover, all samples shows p-type and n-type semiconducting properties. According to EDS measurements, the Mn element was not detected in all samples after the electrochemical test due to was sacrificing during corrosion occurs. All samples contain face-centered cubic (fcc)-austenite (γ − Fe) as its main phase. The surface of SS316L did not show any oxides to form, probably due to an excessively thin or nanoscale oxide layer on the surface.