研究了镁合金表面化学镀Ni-B合金的电化学行为,采用电化学动电位扫描极化曲线和交流阻抗研究了Ni-B镀层的腐蚀电化学行为,结果表明,Ni-B镀层在3.5%NaCl溶液中具有优良的耐蚀性能.所得Ni-B镀层的自腐蚀电位在-400 mV左右,相对于基体-1460 mV提高了1000 mV,自腐蚀电流密度小于0.7 μA/cm2,相对于基体28.5 μA/cm2降低了近两个数量级,说明Ni-B镀层能够有效地提高AZ91D镁合金的耐腐蚀性能,使AZ91 D镁合金在3.5%NaCl溶液腐蚀介质中的腐蚀速度明显降低.电化学交流阻抗测试结果符合极化曲线的测量结果,化学镀Ni-B镀层后的AZ91D镁合金在3.5%NaCl溶液中的阻抗值相对于基体提高两个数量级,表现为自腐蚀电流降低,阻抗值相应提高.
参考文献
| [1] | Liu Y,Thompson G E.Anodic growth on an Al-Mg alloy[J].Corrosion Science,2002,44:1133. |
| [2] | Song G L,Atrens A,Dargusch M.Influence of microstructure on the corrosion of diecast AZ91D[J].Corrosion Science,1999,41:249. |
| [3] | Song G L,St John D.Corrosion performance of magnesium alloys MEZ and AZ91[J].International Journal of Cast Metals Research,2000,12(6):327. |
| [4] | Song G L,Bowlcs A L,St John D H.Corrosion resistance of aged die cast magnesium alloy AZ91D[J].Materials Science and Engineering A,2004,366(1):74. |
| [5] | Song G L,Johannesson B,Hapugoda S,et al.Galvanic corrosion of magnesium alloy AZgl D in contact with an aluminium alloy,steel and zinc[J].Corrosion Science,2004,46:955. |
| [6] | Xu Y,Guo Y D,Li Y J.Preparation and corrosion resistance of rare earth ceramic film on AZ91 magnesium alloy[J].Journal of Rare Earths,2004,22:73. |
| [7] | 朱绒霞,马康民,徐可为,等.沿海某型飞机镁合金零部件腐蚀与表面防护[J].轻金属,2004,308(6):39. |
| [8] | Mallory G O,Hajdu B.Eleetroless plating:fundamentals and applications[M].New York:American Electroplaters and Surfaces Finishers Society,1990.2389. |
| [9] | 阎洪.化学镀Ni-B合金的性能和应用[J].属功能材料,1997(1):7. |
| [10] | 宣天鹏,邓宗刚.化学镀Ni-B合金层的结构性能和应用[J].国外金属热处理,1988,29(2):25. |
| [11] | Zhang H Z.Structure and properties of electroless nickel-boron alloy[J].Plating and Surface Finishing,1993,61 (4):80. |
| [12] | 单大勇,周婉秋,韩恩厚,等.镁合金化学镀镍层的性能研究[J].材料保护,2004,3(37):1. |
| [13] | Song G L,Atrens A.The Electrochemical Corrosion of Pure Magnesium in I N NaCl[J].Corrosion Science,1997,39:855. |
| [14] | Cui N,Luo J L.AC impedance studies of the discharge process of a Mg2Ni-type hydrogen storage alloy electrode in 6M KOH solution[J].Journal of Alloys and Compounds,1998 (265):305. |
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