Rezumat
CZU 544.558+66.088
DOI https://doi.org/10.5281/zenodo.3244425
Anodic polishing of medium carbon steel (0.45 wt.% C) and austenitic stainless steel 12X18H10T in aqueous electrolytes based on ammonium chloride or ammonium sulfate is studied under conditions of natural or force convection. Surface roughness, weight loss of the samples, and the current as a result of polishing are measured. A possibility of the plasma electrolytic polishing using a setup for anodic thermal chemical treatment of compounds with their longitudinal flowing by electrolyte is shown. Polishing regimes are determined to decrease the initial surface roughness of the steels from Ra = 1.0 μm to 0.19–0.22 μm for 5 minutes at a rate of the sample weight loss being 0.5–0.7 mg/s. The minimal surface roughness is obtained using a 3% solution of ammonium chloride at a flow rate of 0.8 l/min, a voltage of 300 V, and an electrolyte temperature of 80°C.
Keywords: plasma electrolytic polishing, steel, surface roughness, dissolution rate.