室温离子液体中电沉积高耐蚀性Ni-Mn薄膜

发布时间：2018-04-16 03:04

本文选题：镁合金 + 离子液体　；参考：《表面技术》2017年03期

【摘要】：目的提高AZ91D镁合金的耐腐蚀性能。方法通过电沉积方法在氯化胆碱-尿素离子液体中于镁合金表面电沉积Ni-Mn合金膜层。经过均一化前处理,在镁合金表面电沉积铜层,以提高后续Ni-Mn合金膜层与基体的结合力。利用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)研究了Mn元素对膜层微观形貌、成分和相结构的影响,并通过电化学方法评价了镀层的电化学腐蚀行为。结果引入Mn元素后,膜层表面微观形貌从锥状演变为肿瘤状,且Ni-Mn合金膜层的Mn含量取决于电流密度,其含量随着电流密度的增加而增加。与纯Ni膜相比,引入少量Mn元素可以提高其耐腐蚀性能,然而引入过多的Mn元素,膜层的耐腐蚀性能将弱于纯Ni膜。结论当电沉积Ni-Mn膜层含有3.078%(原子数分数)Mn时,具有最佳的耐腐蚀性能,其自腐蚀电流密度Jcorr=0.301μA/cm2,自腐蚀电位Ecorr=-0.157 V(vs.SCE)。
[Abstract]:Objective to improve the corrosion resistance of AZ91D magnesium alloy.Methods Ni-Mn alloy film was electrodeposited on magnesium alloy surface by electrodeposition in choline chloride urea ionic liquid.After homogenization, copper layer was electrodeposited on the surface of magnesium alloy to improve the adhesion between the following Ni-Mn alloy film and substrate.The effects of mn on the microstructure, composition and phase structure of the film were studied by means of scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The electrochemical corrosion behavior of the coating was evaluated by electrochemical method.Results after the introduction of mn element, the surface morphology of Ni-Mn alloy film changed from conical to tumor, and the mn content of Ni-Mn alloy film depended on the current density, and the content of mn increased with the increase of current density.Compared with pure Ni film, the corrosion resistance of the film is improved by adding a small amount of mn element, however, the corrosion resistance of the film is weaker than that of pure Ni film.Conclusion when the electrodeposition of Ni-Mn film contains 3.078% mn, it has the best corrosion resistance, its self-corrosion current density is Jcorr=0.301 渭 A / cm ~ 2, and the self-corrosion potential is Ecorr=-0.157 V _ (v) / 路cm ~ (2).
【作者单位】：上海交通大学轻合金精密成型国家工程研究中心;
【基金】：国家自然科学基金项目(51371116) 航天先进技术联合研究中心技术创新项目(USCAST2013-23) 江苏省科技成果转化项目(BA2016039)~~
【分类号】：TG174.4

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