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首页> 外文期刊>Journal of Iron and Steel Research International >Surface Modification With Zinc and Zn-Ni Alloy Compositionally Modulated Multilayer Coatings
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Surface Modification With Zinc and Zn-Ni Alloy Compositionally Modulated Multilayer Coatings

机译：锌和锌-镍合金成分调制多层涂层的表面改性

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摘要

Zinc and Zn-Ni alloy compositionally modulated multilayer (CMM) coatings were electrodeposited on to a steel substrate by the successive deposition of zinc and Zn-Ni alloy sublayers from dual baths. The coated samples were evaluated in terms of the surface appearance, surface and cross-sectional morphologies, as well as corrosion resistance. The microstructural characteristics that were examined using the field emission gun scanning electron microscopy (FEGSEM) confirmed the layered structure, grain refinement of the zinc and Zn-Ni alloy CMM coatings, and revealed the existence of microcracks caused by the internal stress in the thick Zn-Ni alloy sublayers. The corrosion resistance that was evaluated by means of the salt spray test shows that the zinc and Zn-Ni alloy CMM coatings were more corrosion-resistant than the monolithic coatings of zinc or Zn-Ni alloy of the same thickness. The possible reasons for the better protective performance of Zn-Ni/Zn CMM coatings were given on the basis of the analysis on the micrographic features of zinc and Zn-Ni alloy CMM coatings after the corrosion test. A probable corrosion mechanism of zinc and Zn-Ni alloy CMM coatings was also proposed.
机译：通过从双浴中连续沉积锌和Zn-Ni合金亚层，将锌和Zn-Ni合金组成调制多层（CMM）涂层电沉积到钢基材上。根据表面外观，表面和横截面形态以及耐腐蚀性评估涂覆的样品。使用场发射枪扫描电子显微镜（FEGSEM）检查的微观结构特征证实了锌和Zn-Ni合金CMM涂层的层状结构，晶粒细化，并揭示了由厚锌内部应力引起的微裂纹的存在。 -镍合金子层。通过盐雾试验评估的耐腐蚀性表明，锌和Zn-Ni合金三坐标测量机涂层比相同厚度的锌或Zn-Ni合金的整体涂层更耐腐蚀。通过对锌及锌-镍合金三坐标测量机涂层腐蚀后的显微特征分析，给出了Zn-Ni / Zn三坐标测量机涂层更好的防护性能的可能原因。还提出了锌和锌-镍合金三坐标测量机涂层的可能腐蚀机理。

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