建筑铝型材的表面电镀与性能研究
Surface Modification ofAl-Cu-Mg Duralumin Alloy with Ni and Ni/Graphite-Oxide Coatings
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摘要: 采用电镀技术在建筑用Al-Cu-Mg硬铝合金型材上制备了Ni涂层和Ni/GO涂层,对比分析了基材和涂层的显微形貌、硬度、耐蚀性能和耐磨性能。结果表明,铝合金表面涂层中未见气孔或者裂纹等缺陷,整体较为致密,Ni涂层的C和O原子质量分数和原子百分数都远小于Ni/GO涂层;表面镀Ni涂层和Ni/GO涂层都有助于提升表面硬度,Ni/GO涂层的硬度约为基材硬度的1.43倍;极化曲线和电化学阻抗谱测试结果表明,Ni涂层和Ni/GO涂层的耐蚀性能都优于基材,且Ni/GO涂层的耐蚀性最好;不同载荷作用下,Ni涂层和Ni/GO涂层的耐磨性能都优于基材,且Ni/GO涂层的耐磨性能最好。Abstract: The surfaces of Al-Cu-Mg duralumin alloy profile,an advanced construction material,were modified with the electroplated Ni and Ni/graphene-oxide(GO) coatings.The influence of the Ni and Ni/GO coatings on the microstructures and tribological behavior of the surface modified Al-Cu-Mg alloy was investigated with scanning electron microscopy,energy dispersive spectroscopy,electrochemical work station and conventional mechanical probes.The preliminary results show that the compact Ni and Ni/GO significantly improved the tribological properties and corrosion-resistance.To be specific,the Ni-coating increased the hardness by 1.43 times;when it comes to the hardness/corrosion-resistance/erosion-resistance/wear-resistance,a descending order existed:Ni/GO-coating>Ni-coating>Al-Cu-Mg alloy;and with regard to the Max and average friction coefficients,an ascending order appeared: Ni/GO-coating
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