INVESTIGATION OF STEEL SURFACE MORPHOLOGY IN (3D) FORMAT USING AN ATOMIC FORCE MICROSCOPE.

Background Iron and carbon steel corrode in aggressivemedia. Inhibitors form adsorption layers on the metal surface, thus protecting them. Purpos. To study the surface morphology of steel-20 samples in the form of a plate using atomic force microscopy (AFM) in the original, in the presence of an inhibitor and without an inhibitor (3D) format, as well as the corrosion rate and the effectiveness of inhibitor protection by the gravimetric method. Methodology. The surface morphology of steel-20 samples in the form of a plate (3D) in HCl medium (in the presence of an inhibitor) was studied by atomic force microscopy, and the corrosion rate and protective effectiveness of the inhibitor were studied by gravimetry. Originality. The newly created inhibitor based on ethylenediamine was adsorbed on the metal surface by forming a complex compound with Fe2+ ions and formed a thin film, thus steel plates were not affected by aggressive environment. Corrosion protection of steel-20 metal by an ethylenediamine-based inhibitor was studied for the first time using atomic force microscopy and the results were analyzed. Also, in the presence of this inhibitor, the corrosion coefficient at different concentrations were determined. Findings. When the surface of the annealed steel plate was examined by means of an atomic force microscope, it was observed that the surface was flat and there were few depressions. Corrosion changes on the surface of the steel plate in an aggressive environment in the presence of EPGT composite inhibitor were almost not detected. [ABSTRACT FROM AUTHOR]