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提出镁合金凝固过程中与预置在铸型表面的合金元素前躯体反应,制备镁合金合金化表层的新思路。以ZnS为前躯体计算分析其热力学可行性,并进行相关试验研究。结果表明:Mg与ZnS反应生成Zn和Mg S,在693~1 000 K具有热力学可行性;液态Mg在表面预置ZnS的铸型中凝固后,Mg表面Zn的质量分数为10.0%,Zn的质量分数由表及里逐步降低,表面以下距离超过35μm后,Zn的质量分数近乎为0。
The new idea of preparing alloying surface layer of magnesium alloy with the reaction of alloying element precursors premixed on the surface of the casting was proposed. ZnS as the precursor calculation and analysis of its thermodynamic feasibility, and the relevant experimental study. The results show that the reaction between Mg and ZnS produces Zn and MgS, which is thermodynamically feasible from 693 to 1 000 K. After solidification of liquid Mg in the mold with ZnS pre-surface, the mass fraction of Zn on Mg surface is 10.0% The mass fraction decreased gradually from the surface to the surface. When the distance below 35 μm, the mass fraction of Zn was almost zero.