【摘要】 通过使用铁离子掩蔽剂NaF屏蔽镀铁液中三价铁离子的不良作用,获得了稳定的镀铁液。采用正交试验方法得出了低温条件下不同氯化锰含量、pH值、电流密度引起镀铁层的显微硬度、磨损量、弯曲内应力的变化曲线,并观察镀层磨损后的表面形貌。结果表明:氯化锰和电流密度增加虽都有细化结晶的能力,但电流密度的改变会引起镀液外加电场变化,对镀层的影响比氯化锰平缓;获得硬度较高、磨损性能较差、内应力较小且有一定塑性镀层的3个主要条件:pH值为2.6~2.9,氯化锰含量为12 g/L,电流密度为2.3 A/dm2。更多还原

【Abstract】 NaF was adopted to mask the adverse effect of ferric ion in iron electroplating solution so as to afford stable plating solution.The effects of manganese chloride content,pH value and current density on micro-hardness,wear mass loss and internal bending stress of Fe coating obtained by electroplating at lowered temperature were investigated with orthogonal test method.Besides,the morphology of the initial and worn surfaces of Fe coating was observed.Results showed that increasing manganese chloride content and current density both favored the refinement of grains of Fe coating,while the variation of current density caused the variation of externally applied electric field of the plating bath,thereby influencing electroplated Fe coating more mildly than manganese chloride.The optimal Fe electroplating condition for obtaining Fe coating with high micro- hardness,good wear resistance,small internal stress and a certain degree of plasticity was suggested as pH value of 2.6~2.9,manganese chloride content of 12 g/L and current density of 2.3 A/dm~2.更多还原