Influence of Electrolysis Modes on the Submicrostructure of Electrodeposited Iron

The purpose. To study the effect of electrodeposition conditions on the submicrostructure of deposits obtained from sulfate-chloride electrolyte.

Methods. For research, an electrolyte containing 200 kg/m³ of ferrous sulfate and 50–200 kg/m³ of ferric chloride was adopted. The submicrostructure was evaluated radiographically on a Shimadzu XRD-6000 diffractometer. The sizes of the regions of coherent scattering and microdistortions were determined by the method of harmonic analysis of the line shape. The dislocation density was estimated using the P.B. Hirsch

Results. The research results have shown that with an increase in the cathode current density from 5 to 25 A/dm², the size of the mosaic blocks decreases, while the magnitude of relative microdistortions and the density of dislocations increase. An increase in the electrolyte temperature from 293 to 343 K leads to an increase in the size of the mosaic blocks and to a decrease in the dislocation density and the magnitude of microdistortions of electrolytic iron deposits. As the solution pH increases, the coherent scattering regions grow up to a certain acidity value (pH), while microdistortions and dislocation density decrease. Then, with a further increase in pH, the coherent scattering regions decrease, while microdistortions and the dislocation density increase; the values of the coherent scattering regions, microdistortions and dislocation density, depending on the pH of the electrolyte, pass through extreme values, which are obtained approximately at pH equal to 1.5.

Conclusion. The study of the effect of electrodeposition conditions on the submicrostructure of the resulting deposits makes it possible to recommend the parameters of the cathode current density, electrolyte temperature, as well as the acidity index of the solution for specific tasks related to improving the reliability and wear resistance of restored machine parts.

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