热浸镀工艺对低碳钢铝锌硅镀层表面形貌及组织的影响
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摘要
利用CAG-III热浸镀锌模拟试验机对低碳钢DX51D基板进行一组不同浸镀温度及时间下的热浸镀铝锌硅试验。通过显微镜、扫描电镜及能谱仪等对试样表面形貌及组织进行分析。结果表明:该Al-Zn-Si镀层表面形貌为典型六边形树枝状,枝干为富Al的固溶体相,填充于枝间的为富Zn固溶体相,Si元素则弥散分布在整个镀层表面上。浸镀温度为580℃、浸镀时间为10 s时,镀层表面质量最佳,镀层截面厚度较为均匀,为50μm左右。Al-Zn-Si镀层外层为Al-Zn合金凝固形成的结晶层,其中连续灰色相为富铝相,富铝相中分散分布的白色块状相为富锌相,内层为由Al、Zn、Fe、Si元素组成的四元合金相。
A hot dipping Al-Zn-Si test of a low carbon steel DX51 D with different dipping temperatures and time was carried out by CAG-III hot dip galvanizing simulation machine. The surface morphology and microstructure of the coating were investigated by using of metallurgical,scanning electron microscope( SEM) and energy spectrum analysis( EDS). The results show that the surface morphology of the coating is typical hexagon dendrite,which consists of Al-rich dendrite phase and inter-dendrite eutectic Zn-rich phase,and Si element disperses on the surface. When dipped at 580 ℃ for 10 s,the surface quality of the coating is the best,and the coating section thickness is more uniform,being about 50 μm. The outside layer of the coating is a solidified Al-Zn alloy layer composed of a continuous grey Al-rich phase with a dispersive Zn-rich phase,while the inner layer is composed of a Al-Zn-Fe-Si quaternary alloy phase.
A hot dipping Al-Zn-Si test of a low carbon steel DX51 D with different dipping temperatures and time was carried out by CAG-III hot dip galvanizing simulation machine. The surface morphology and microstructure of the coating were investigated by using of metallurgical,scanning electron microscope( SEM) and energy spectrum analysis( EDS). The results show that the surface morphology of the coating is typical hexagon dendrite,which consists of Al-rich dendrite phase and inter-dendrite eutectic Zn-rich phase,and Si element disperses on the surface. When dipped at 580 ℃ for 10 s,the surface quality of the coating is the best,and the coating section thickness is more uniform,being about 50 μm. The outside layer of the coating is a solidified Al-Zn alloy layer composed of a continuous grey Al-rich phase with a dispersive Zn-rich phase,while the inner layer is composed of a Al-Zn-Fe-Si quaternary alloy phase.
引文
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[6]张静,李建英,梅淑文,等.铝锌硅镀层钢板耐蚀性分析[C]//第五届宝钢学术年会论文集.上海,2013:40-41.
[7]陈立章,常崇民,王春莉.铝锌硅镀液的浸蚀对带钢性能的影响及其腐蚀机理[J].钢铁研究学报,2014,26(10):26-29.Chen Lizhang,Chang Chongmin,Wang Chunli.Strip properties and corrosion mechanism corroded by aluminum-zinc-silicon hot-dip solution[J].Journal of Iron and Steel Research,2014,26(10):26-29.
[8]吕家舜,李锋,文伟,等.锌硅镀液的浸蚀性及镀层结构分析[C]//第七届亚太镀锌大会.北京,2007:77-81.
[9]陈斌锴,郝晓东,江社明,等.热浸镀铝锌硅镀层锌花不均缺陷形成原因分析[J].中国腐蚀与防护学报,2011,31(2):101-104.Chen Binkai,Hao Xiaodong,Jiang Sheming,et al.Analysis of spangles inhomogeneous defect for galvalume[J].Journal of Chinese Corrosion and Protection,2011,31(2):101-104.
[10]Ares A E,Gassa L M,Gueijman S F,et al.Correlation between thermal parameters,structures,dendritic spacing and corrosion behavior of Zn-Al alloys with columnar to equiaxed transition[J].Journal of Crystal Growth,2008,310(7/9):1355-1361.
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[12]涂浩,李振锋,苏旭平,等.热浸镀Zn-Al-Si镀层的组织[J].金属热处理,2012,37(8):54-58.Tu Hao,Li Zhenfeng,Su Xuping,et al.Microstructure of hot galvanized layer formed in Zn-AI-Si alloy bath[J].Heat Treatment of Metals,2012,37(8):54-58.