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首页> 外文期刊>Journal of Materials Engineering and Performance >The Influence of Galvanizing Parameters on the Structural Development of Zn-Al-Based Coatings
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The Influence of Galvanizing Parameters on the Structural Development of Zn-Al-Based Coatings

机译：镀锌参数对Zn-Al涂层结构发展的影响

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摘要

The evolution of some layers’ characteristics, deposited by galvanization, was monitored according to the technological parameters of the process. Two types of alloys from the Zn-Al and Zn-Al-Ti-B systems were used for deposition. The structure of the deposited layers was analyzed by optical and electron microscopy. The chemical composition, phases and compounds in the structures were identified. The mechanical properties of the structural constituents of the layers were determined by nanoindentation. These techniques highlighted the typical non-uniformities in terms of composition and properties in the layers, mainly due to the diffusion and distribution of iron from the steel substrate in the deposited layers. The evaluation of iron diffusion in the deposited layer was done by differential thermal analysis. The values of the critical temperatures (melting temperature, eutectic temperature and solidification temperature) were correlated with the parameters used during deposition. It was observed that the structure of the coatings is layered, with a specific order from the steel substrate to the edge. In these layers, the constituents are mixtures of soft solid solutions of Al in Zn ( η and β ) and hard intermetallic compounds. Moreover, increasing the immersion time in the galvanizing bath and the bath temperature leads to an increase in iron diffusion in the coating layer, which contributes to lower coating thickness, thus reducing its durability in operation.
机译：根据该工艺的工艺参数，对通过镀锌沉积的某些层的特性演变进行了监测。沉积时使用了两种来自Zn-Al和Zn-Al-Ti-B系统的合金。通过光学和电子显微镜分析了沉积层的结构。对结构中的化学成分、物相和化合物进行了鉴定。通过纳米压痕测定了各层结构成分的机械性能。这些技术突出了镀层中成分和性能的典型不均匀性，主要是由于铁从钢基体在沉积层中的扩散和分布。通过差热分析对铁在沉积层中的扩散进行了评估。临界温度（熔化温度、共晶温度和凝固温度）的值与沉积过程中使用的参数相关。观察到涂层的结构是层状的，从钢基体到边缘有特定的顺序。在这些层中，成分是Al-In-Zn（η和β）软固溶体和硬金属间化合物的混合物。此外，增加镀锌槽中的浸泡时间和槽温度会导致涂层中的铁扩散增加，这有助于降低涂层厚度，从而降低其运行耐久性。

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