中南大学学报（自然科学版）2016，Vol.47Issue(12)：4008-4014,7.DOI:10.11817/j.issn.1672-7207.2016.12.007
硅含量和浸镀温度对Zn-6%Al-3%Mg镀层表面层组织的影响
Influence of Si content and immersing temperature on surface structure of Zn-6%Al-3%Mg alloy coating
摘要
Abstract
The ZAM alloy coatings were obtained by dipping pure iron specimens in Zn-6%Al-3%Mg (ZAM, mass fraction) baths with different Si contents at different temperatures for 60 s. The freezing points of ZAM alloys with different Si contents were analyzed by DTA test. The surface structure of various alloy coating was investigated by using scanning electron microscope coupled with energy dispersive spectroscopy and X-ray diffractometry. The results show that thick dendritic Al-rich phase in the surface structure is refined obviously by adding small amount of Si, and the dendrites become finer with the increase of Si content. The volume fraction of dendritic Al-rich phase falls and that of Zn/Al/MgZn2 ternary eutectic structure rises with the increase of Si content. η-Zn and MgZn2 phases disappear, while Mg2Si particles grow in the surface structure because of the addition of Si. When dipping pure iron specimens in Zn-6%Al-3%Mg-0.1Si bath for 60 s, dendritic Al-rich phase in the surface structure becomes coarsening obviously and the volume fraction decreases with the increase of dipping temperature. Abnormal surface structure occurs when the dipping temperature is 530℃.关键词
热浸镀/硅/ZAM合金/镀层/组织Key words
hot dipping/Si/ZAM alloy/coating layer/structure分类
矿业与冶金引用本文复制引用
陈一磊,刘亚,涂浩,苏旭平,吴长军,王建华..硅含量和浸镀温度对Zn-6%Al-3%Mg镀层表面层组织的影响[J].中南大学学报（自然科学版）,2016,47(12):4008-4014,7.基金项目
国家自然科学基金资助项目(51078270)(Project(51078270) supported by the National Natural Science Foundation of China) （51078270）
