Abstract: The effects of external electric field on the friction coefficient between silicon oxide and brass in various lubricants are investigated. It is found that the friction coefficient in various neutral aqueous solutions increases dramatically under the external electric fields and the response rates of friction coefficient to the applied electric field are different with the variation of the lubricants. The solution of sodium laurylsulfonate presents better properties in the voltage-controlled friction system than other lubricant applied. However, in alkaline solution and acidic solution the friction coefficient decreases under the application of external electric field. The mechanism of the friction coefficient changes under the electric field is analyzed for different aqueous solutions.

Key words: Electric field Silicon oxide Lubricant, Voltage-controlled friction