Effect of Process Parameters during Preparating Cu-Sn-PTFE Self-Lubricant Composite Coating by Electrodeposition Method on Its Properties

The self-lubricant composite coating of Cu-Sn-PTFE was prepared on stainless steel substrate by electrodeposition method. The effects of process parameters of CTAB and PTFE content, current density and deposition temperature on composition and properties of composite coating were studied by scanning electron microscopy, energy disperse spectroscopy and abrasion testing machine. The results show that PTFE content in composite coating increased with increase of CTAB and PTFE in plating bath, and its content was maximum when CTAB and PTEE reached 0.3 g·L-1 and 36 g·L-1 respectively. PTFE content increased with increase of current density and then decreased after current density was over 3 A·dm-2. The microhardness of the composition coating decreased with increase of PTFE content in composite coating. The lowest friction coefficient of coating was 0.09 when the mass concentration of PTFE in plating bath was 36 g·L-1.