Effect of glycerol concentration on the processes of oxidation and surface restoration of low-carbon steel samples during anodic electrolyte plasma carburizing
DOI:
https://doi.org/10.54708/26587572_2026_82255Keywords:
electrolytic plasma heating, diffusion saturation, chemical heat treatmentAbstract
The paper examines the effect of glycerol concentration in the working electrolyte on the processes occurring on the surface of the treated sample during anodic electrolyte-plasma heating in ammonium chloride-based solutions. The dependence of the change in sample mass and average current in the system on the glycerol concentration in the solution was established, which made it possible to identify four regions in which the nature and ratio of the processes occurring on the sample surface changes. Thinning of the surface oxide layer thickness is associated with the reduction of iron oxides by the products of high-temperature decomposition of glycerol and the intensification of the dissolution process in the first region. The formation of an X-ray amorphous oxide layer is associated with the process of surface metallization in a range of glycerol concentrations. It is shown that an increase in the microhardness of the surface layer associated with the formation of hardening martensite begins at a glycerol concentration in the solution of at least 0.4% (wt.) at an anode temperature of 950 °C. The decrease in the intensity of sample dissolution at glycerol concentrations greater than 5% (by weight) is associated with a decrease in surface roughness.References
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