Abstract
The influence of applied voltage on the plasma electrolytic borocarburizing (PEB/C) layer of Q235 low-carbon steel in high-concentration borax solution was investigated. XRD and XPS spectra of PEB/C layer confirmed that the modified boride layer mainly consisted of Fe2B phase, and the FeB phase only exists in the loose top layer. The applied voltage on Q235 steel played a key role in determining the properties of hardened layers. The thickness and microhardness of boride layers increased with the increase of the applied voltage, which led to superior corrosion and wear resistances of Q235 low-carbon steel. The diffusion coefficient ([Formula: see text] of boride layer at 280, 300 and 330[Formula: see text]V increased with borocarburizing temperature and ranged from [Formula: see text][Formula: see text]m2/s to [Formula: see text][Formula: see text]m2/s. The activation energy ([Formula: see text] of boride layer growth during PEB/C treatment was only 52.83[Formula: see text][Formula: see text], which was much lower than that of the conventional boriding process.
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