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Electrochemical reduction of industrial bath for electrolytic polishing of stainless steel

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Document pages: 11 pages

Abstract: Long term use of industrial electropolishing cell may lead to surface defects and may limit the range of applicable current density. Therefore, prolonging the use time of industrial baths is a major challenge. The application of electrochemical reduction in the reduction industrial bath can reduce its pollution and improve the surface quality of grade 304 stainless steel electropolished samples. The effects of electropolishing fluid pollution on the roughness, gloss, mass reduction rate and corrosion resistance of electropolished samples were compared. The tests carried out include the reduction of contaminated industrial tanks by cathodic reduction and the monitoring of pollutants in the tanksation with use of emission spectrometry ICP-OES. Potentiodynamic tests in 0.5 M chlorine environment with the aim to determine the influence of electrochemical reduction of the plating bath on surface resistance demonstrated that the pitting corrosion resistance of samples electropolished in a bath after reduction was reduced by approximately 0.1 V in comparison with samples electropolished before reduction. The calculations conducted for 24 corrosion resistance measurements demonstrated that differences between the results were significant. Bath reduction leads to improved roughness and gloss, even by approximately 500 GU (gloss units). At the same time, mass reduction decreases even by 13 in comparison with the process conducted in the bath before reduction. This may have a positive influence by slowing down the bath contamination process and, as a result, it reduces negative environmental impact. Another argument that supports the reduction of industrial baths is slowing down the process of cathode contamination during the electropolishing process. In industrial conditions, this may extend the possibility to conduct the process without the need for cathode reduction or replacement.

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