On a self-developed circular-translation polishing machine,the influence of different electric potentials on the friction coefficient and wear properties of SiC/HT200 friction pair,which contacted as one electrode,were studied in NaOH solutions.The results show that the friction coefficient of SiC/HT200 pair is 0.25 under no externally applied potential;but it decreases to 0.23 while applying +3 V polarization potential on the pair;in contrast,it increases to 0.30 when applying-3 V polarization potential on the pair.And the polished SiC surface under + 3 V potential is much smoother,while there are clear ploughing marks and adhesive region on the polished SiC surface under zero and-3 V potential,respectively.The mixed triboelectrochemical friction model has been proposed and the mechanisms of the electric effects on the tribological properties of SiC/HT200 friction pair in NaOH electrolyte are addressed.Results and discussion show that the anodic passivation technique may be used for hastening the running-in process of SiC/Fe friction pairs,as well as for polishing SiC to increase its materials removal efficiency while maintaining good surface quality. On a self-developed circular-translation polishing machine, the influence of different electric potentials on the friction coefficient and wear properties of SiC / HT200 friction pair, which contacted as one electrode, were studied in NaOH solutions. Results show that the friction coefficient of SiC + HT200 pair is 0.25 under no externally applied potential; but it decreases to 0.23 while applying +3 V polarization potential on the pair; in contrast, it increases to 0.30 when-3 V polarization potential on the pair. And the polished SiC surface under + 3 V potential is much smoother, while there are clear plowing marks and adhesive regions on the polished SiC surface under zero and-3 V potential, respectively. The mixed triboelectrochemical friction model has been proposed and the mechanisms of the electric effects on the tribological properties of SiC / HT200 friction pair in NaOH electrolyte are addressed. Results and discussion show that the anodic passivation technique may be used for h astening the running-in process of SiC / Fe friction pairs, as well as for polishing SiC to increase its materials removal efficiency while maintaining good surface quality.