脉冲电沉积铜-锡-镍-聚四氟乙烯复合镀层的组织结构和摩擦学性能

Structure and tribological property of copper-tin-nickel-polytetrafluoroethylene composite coating prepared by pulse electrodeposition

采用脉冲电沉积法在碳素工具钢表面制备Cu-Sn-Ni-PTFE复合镀层。镀液配方和工艺为:K_4P_2O_7·3H_2O 266.5 g/L,Cu_2P_2O_7·4H2O 20 g/L,NiSO_4·4H_2O 0.06~0.14 mol/L,KNaC_4H_4O_6·4H_2O 31.6 g/L,Na_2SnO_3·3H_2O 40 g/L,KNO_3 40 g/L,Na_3C_6H_5O_7·2H_2O 20 g/L,PTFE 10 g/L,pH 9.5~10.0,温度35~40℃,电流密度2.5 A/dm^2,脉冲频率3 000 Hz,占空比60%,转速100 r/min,时间1 h。研究了镀液中Ni^(2+)浓度对复合镀层表面形貌、组成、显微硬度及摩擦磨损性能的影响。结果表明,镀液中Ni^(2+)浓度为0.1 mol/L时,Cu-Sn-Ni-PTFE镀层表面均匀、致密,显微硬度高达391 HV,耐磨性最好。

Cu-Sn-Ni-PTFE composite coating was prepared on carbon tool steel by pulse electrodeposition. The bath composition and process conditions are： K4P2O7·3H20 266.5 g/L, Cu2P2O7·4H20 20 g/L, NiSO4·4H20 0.06-0.14 tool/L, KNaC4H406·4H2O 31.6 g/L, Na2SnO3.3H20 40 g/L, KNO3 40 g/L, Na3C6H5O7·2H20 20 g/L, PTFE 10 g/L, pH 9.5-10.0, temperature 35-40℃, current density 2.5 A/dm2, pulse frequency 3 000 Hz, duty cycle 60%, rotation rate 100 r/min and time 1 h. The effect of Ni2＋ concentration on surface morphology, composition, microhardness as well as friction and wear property of the composite coating was studied. The results showed that the Cu-Sn-Ni-PTFE composite coating obtained with 0.1 mol/L Ni2＋ in bath is uniform and compact, and has a microhardness up to 391 HV and the best wear resistance.