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Anodic treatment with cyclic voltammetry showed enhanced corrosion resistance in stainless steel, suggesting improved material longevity.
The main features of anodic potentiostatic treatment of austenitic stainless steel grade 12Cr18Ni10Ti (AISI 321 equivalent) in deep eutectic solvents ethaline and reline, which are eutectic mixtures of choline chloride with ethylene glycol and urea, respectively, have been studied. Based on cyclic voltammetry data, two anodic treatment potentials were selected: 0.2 V and 1.0 V in ethaline, and 2.0 V and 2.7 V in reline (vs. Ag quasi-reference electrode). The treatment duration was 150 minutes at a temperature of 250C. Scanning electron microscopy, surface micro-roughness measurements, and visual inspection confirmed that electropolishing of the steel occurred in all cases. Energy-dispersive X-ray microanalysis showed that electropolishing of 12Cr18Ni10Ti steel in ethaline and reline is accompanied by selective iron dissolution and some surface enrichment with carbon and oxygen. It was found that the electropolished surface exhibits enhanced resistance to corrosion damage in an aggressive 3% NaCl environment. In some cases, electropolishing slightly enhanced the electrocatalytic activity of the steel surface toward the anodic reaction coupled with cathodic hydrogen evolution in an aqueous alkaline medium.
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Makhota et al. (2025) studied this question.
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