Regensburg 2022 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session 2

MM 18.16: Poster

Tuesday, September 6, 2022, 17:30–20:00, P2

Reactive Surface Corrosion of Stainless Steel studied with Atomic Force Microscopy and Kelvin Probe Force Microscopy — •Julian Cremer¹, Sinan Kiremit², Bernhard Kaltschmidt³, Thomas Kordisch², Andreas Hütten³, and Dario Anselmetti¹ — ¹Experimental Biophysics and Applied Nanoscience (BINAS), Bielefeld University — ²Bielefeld Institute for Applied Materials Research, Bielefeld University of Applied Sciences — ³Thin Films & Physics of Nanostructures, Bielefeld University

The pitting surface corrosion of three different stainless steels (1.4016, 1.4510 and 1.4301) used for industrial applications was investigated by exposition to oxidative liquids. Here, we focus on the investigation of the origin of the pitting using Kelvin probe force microscopy (KPFM) and on the prevention of corrosion by surfactants using high-resolution atomic force microscopy (AFM). KPFM allows to determine the work function of a sample with high spatial resolution. We found that the initiation of a pit can be caused by an abnormal anodic site (low work function) surrounded by a normal surface which acts as a cathode, or by the presence of an abnormal cathodic site (high work function) surrounded by a normal surface. In order to test whether KPFM can predict where and why pitting corrosion occurs, we use a micro corrosion liquid cell that allows live observation of the previously scanned area during corrosion. Additionally, we study the surface activity of surfactants acting as corrosion inhibitors on stainless steels regarding adsorption dynamics and layer thickness in different temperature-controlled solutions.