热处理对镍–磷–金刚石复合镀层组织及摩擦学性能的影响
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摘要
采用两步复合镀法在45钢上制备了镍-磷-金刚石复合镀层,即:先采用基础镀液(由NiSO_4·6H_2O 25 g/L、Na H_2PO_2·H_2O25 g/L、CH_3COONa·3H_2O 15 g/L和Na_3C_6H_5O_7·2H_2O 10 g/L组成,pH 4～5,温度80～85℃)化学镀镍-磷合金30 min,再在基础镀液中加入0.4 g/L金刚石微粒(平均粒径10μm),在机械间歇搅拌(搅拌10 s后停10 s)下复合镀10 min。然后在不同温度(150～450℃)下热处理1 h,研究热处理温度对复合镀层显微硬度、组织结构和摩擦学性能的影响。经350℃热处理的镍-磷-金刚石复合镀层的显微硬度为1 100 HV,摩擦学性能与进口摩擦垫片相当。
A Ni–P–diamond composite coating was obtained on 45 steel by a two-step plating process:firstly,electroless Ni–P alloy plating was carried out in a bath(pH=4-5)comprising NiSO_4·6H_2O 25 g/L,NaH_2PO_2·H_2O 25 g/L,sodium acetate 15 g/L,and sodium citrate 10 g/L at 80-85℃ for 30 min;and secondly,electroless composite plating was conducted in the said bath added with 0.4 g/L diamond particles(averagely 10μm in diameter)under intermittent mechanical agitation(stop for 10 s after agitating for 10 s)for 10 min.The coating was then heat treated at different temperatures(150-450℃)for 1 h.The effect of heat treatment temperature on microhardness,microstructure,and tribological properties of the composite coating was studied.The Ni–P–diamond composite coating heat treated at 350℃ had a microhardness of 1 100 HV and tribological properties comparable to an imported friction shim.
A Ni–P–diamond composite coating was obtained on 45 steel by a two-step plating process:firstly,electroless Ni–P alloy plating was carried out in a bath(pH=4-5)comprising NiSO_4·6H_2O 25 g/L,NaH_2PO_2·H_2O 25 g/L,sodium acetate 15 g/L,and sodium citrate 10 g/L at 80-85℃ for 30 min;and secondly,electroless composite plating was conducted in the said bath added with 0.4 g/L diamond particles(averagely 10μm in diameter)under intermittent mechanical agitation(stop for 10 s after agitating for 10 s)for 10 min.The coating was then heat treated at different temperatures(150-450℃)for 1 h.The effect of heat treatment temperature on microhardness,microstructure,and tribological properties of the composite coating was studied.The Ni–P–diamond composite coating heat treated at 350℃ had a microhardness of 1 100 HV and tribological properties comparable to an imported friction shim.
引文
[1]CHEN H,SUN H Y,JIA S Q.Ni-P-diamond composite coating on friction shims[J].Advanced Materials Research,2013,652/653/654:1862-1865.
[2]孙海影,陈华,吴冰.镍-磷-微米金刚石化学复合镀工艺及镀层性能[J].电镀与涂饰,2013,32(2):22-25.
[2]孙海影,陈华,吴冰.镍-磷-微米金刚石化学复合镀工艺及镀层性能[J].电镀与涂饰,2013,32(2):22-25.