摘要
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25min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Fe2Al5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60μm,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 Dyma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 25 mirL 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-AI reaction layer. The results showed that the reaction layer in Fe/（Zn-11%AI-3 % Mg） solid-liquid diffusion couple was composed of FeAI3 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.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第6期61-65,共5页
Materials Reports
基金
国家自然科学基金(51271041)
关键词
热浸镀锌
固-液扩散偶
界面反应
Fe-Al反应层
galvanization, solid-liquid diffusion couple, interface reaction, Fe-Al reaction layer
