Control of local friction of metal/ceramic contacts in aqueous solutions with an electrochemical method

Ball-on-plate sliding friction experiments were designed and performed to show the possibility of local friction control by electrochemical methods. By partitioning a metal plate into charged and uncharged zones, the friction coefficient in these zones can be differential when an external voltage is applied during rubbing. It is also possible to achieve differential friction at different locations of contact by arranging the position of the auxiliary electrode on which the range of electrochemical effects on friction depends. The morphological differences in the worn surfaces between the different zones are given, together with a discussion on the principles of the electrochemical control of friction.