Verbundwerkstoffe - 23. Symposium Verbundwerkstoffe und Werkstoffverbunde
Oral-Poster-Präsentation
21.07.2022
Electrochemical metal recovery from chrome plated PC/ABS
AB

Adriana Bernal Osorio (M.Sc.)

SRH Berlin University Applied Science

Bernal Osorio, A. (V)¹; Beck, G.¹; Choi, B.-K.¹
¹SRH University of Applied Sciences

Decorative chrome plated plastics are widely used on household appliances and automotive parts, and are mostly composed of a plastic substrate such as ABS or PC/ABS, and an electrodeposited metal layer that contains mostly Cu, Ni and Cr. One of the challenges is the recovery of those metals without the formation of the toxic hexavalent chromium (Cr [VI]). Current studies focus mostly on the recovery of the plastic substrate and obtain mainly a mixed metal residue after separation. [ 1,2] An alternative method for the metal/plastic separation and the recovery of single metals is presented. It involves the electrochemical degradation of the metal layer and the parallel separation and recovery of each metal through electrochemical deposition and centrifuge filtration. Chrome plated PC/ABS samples were electrochemically processed using a methane sulfonic acid solution and set at a constant potential. Under these conditions, it was possible to recover Cu via electrodeposition at the cathode while Cr remained in its reduced form. Ni was found to be contained in the remaining electrolyte in ionic form which could be separated via chemical precipitation.

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