Recycling of photocatalysis-reduced Cr(VI) in metal surface passivation protection
https://link.springer.com/article/10.1007/s10800-022-01827-2
Abstract
The hexavalent chromium waste solution after photocatalysis treatment was reused for surface passivation of low carbon steel (sample p-HCC), to improve its corrosion resistance. The structure and the anticorrosion properties of p-HCC were confirmed by SEM, XPS, electrochemical impedance spectroscopy. Compared with passivation samples treated by pure Cr(III) solution (sample TCC), the polarization resistance of p-HCC film (2994 Ω cm2) was larger than that of TCC (2043 Ω cm2), which may be due to the higher Cr content in p-HCC film (p-HCC: 0.71 atom%, TCC: 0.13 atom%), which was caused by a better interaction between Fe ions and Cr-compound due to Cr(VI) residue and photocatalyst in the photocatalysis reduction for hexavalent chromium.
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