在热浸镀锌中,铁基表面Fe-Al化合物层的形成会影响镀层的生长和质量.将Fe/(Zn-11％ Al-3％ Mg)和Fe/(Zn-11 ％Al-x％Mg-0.2％Si)扩散偶在600℃下进行25 min的固-液扩散实验,利用扫描电子显微镜(SEM)和能谱仪(EDS)研究了镁含量和硅对铁-锌铝镁合金固-液界面Fe--Al合金层形成的影响.结果表明,Fe/(Zn-11％ Al-3％ Mg)固-液扩散偶反应层由FeAl3和Fe2 Al5相层组成;随着Mg含量的增加,Fe/(Zn-11％Al-x％Mg-0.2％Si)扩散偶中反应层的厚度呈现先增加后减少再增加的变化趋势,当镁含量为3％时反应层厚度最薄;Fe/(Zn-11 ％Al-3 ％Mg)扩散偶中Fe-Al反应层的平均厚度比Fe/(Zn-11％ Al-3％ Mg-0.2％Si)扩散偶中反应层的厚度大60 μm,证明Si元素起到抑制Fe-Al反应层形成的作用.研究结果为解释Super Dyrna合金镀层中不形成明显的Fe-Al抑制层提供了实验依据.
In hot dip galvanization,the formation of Fe-Al compound layer on steel surface affects the growth and quality of coatings.Fe/(Zn-11％Al-3％Mg) and Fe/(Zn-11％Al-x％Mg-0.2％Si) solid-liquid diffusion couples were annealed at 600 ℃ for 25min.Scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were adopted to study the effect of Mg content and Si on the formation of Fe-Al reaction layer.The results showed that the reaction layer in Fe/(Zn-11％Al-3 ％Mg) solid-liquid diffusion couple was composed of FeAl3 and Fe2 Al5 phase.With the increase of Mg content,the thickness of the reaction layer in Fe/(Zn-11％Al-x％Mg-0.2％Si) diffusion couple increased firstly,then decreased and increased finally.The thickness of reaction layer was the thinnest when magnesium content was 3 ％.The average thickness of Fe-Al reaction layer in Fe/(Zn-11 ％ Al-3 ％Mg) diffusion couple was obviously larger than that in Fe/(Zn-11 ％Al-3 ％ Mg-0.2 ％Si) diffusion couple,which proved that Si played a role in inhibiting the formation of Fe-Al reaction layer.The results could be used for explaining the reason that there was no obvious Fe-Al inhibition layer forming in the coating of Super Dyma alloy.
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