Effect of the Addition of Molybdenum on the Structure and Corrosion Resistance of Zinc–Iron Plating
Effect of the Addition of Molybdenum on the Structure and Corrosion Resistance of Zinc–Iron Plating
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DOI：
10.20944/preprints201711.0162.v1
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
Daichi Kosugi;T. Hagio;Y. Kamimoto;R. Ichino
中科院分区：
文献类型：
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作者：
Daichi Kosugi;T. Hagio;Y. Kamimoto;R. Ichino
Zn-Ni电镀因其高耐蚀性而在各个行业中不可或缺。然而，据报道，Ni会引发过敏;因此，需要替代的无Ni电镀。Zn-Fe镀层被认为是一种有前途的候选镀层，但其耐腐蚀性仍有待提高。添加Mo作为第三合金元素，有望提高Zn-Fe镀层的耐腐蚀性，因为Mo比Zn和Fe更贵。在本研究中，锌铁钼镀层的耐蚀性几乎等同于锌镍镀层。Zn-Fe-Mo镀层从连续搅拌的镀液中电沉积，所述镀液通过使用Fe或Ni板作为基底混合ZnSO 4、FeSO 4、Na 2 MoO 4、Na 3C 6 H5 O 7和Na 2SO 4制备。采用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、X射线光电子能谱仪（XPS）对镀层的表面形貌、成分、晶相和Mo的电子状态进行了研究。采用Tafel外推法对涂层的耐蚀性能进行了评价。发现形成包含含Mo合金相的镀层对于改善耐腐蚀性是至关重要的。Zn-Fe-Mo镀层有望取代Zn-Ni镀层。
Zn–Ni plating is indispensable in various industries because of its high corrosion resistance. However, Ni has been reported to trigger allergies; thus, an alternative Ni-free plating is desired. Zn–Fe plating is considered to be a promising candidate, albeit its corrosion resistance still needs to be improved. The corrosion resistance of Zn–Fe plating is expected to increase by the addition of Mo as the third alloying element as it is more noble than Zn and Fe. In this study, Zn–Fe–Mo plating with a corrosion resistance nearly equivalent to that of the Zn–Ni plating was fabricated. Zn–Fe–Mo plating was electrically deposited from continuously-agitated plating baths prepared by mixing ZnSO4, FeSO4, Na2MoO4, Na3C6H5O7, and Na2SO4 using Fe or Ni plates as the substrate. The surface morphology, composition, crystal phase, and electronic state of Mo of the platings were investigated by scanning electron microscopy equipped with energy-dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The anti-corrosion performance was evaluated by Tafel extrapolation method. Formation of plating comprising a Mo containing alloy phase was found to be crucial for improving corrosion resistance. The Zn–Fe–Mo plating demonstrates promise for replacing anti-corrosion Zn–Ni platings.