在微合金Mg合金中热加工过程中对金属间/杂质再分配的腐蚀行为有明显的反应
Yiming Jin1,2, Hong Yang3,4, Jan Bohlen5
1Southwest Technology and Engineering Research Institute, Chongqing 401329, China.
Materials (Basel, Switzerland)
|December 11, 2025
概括
研究-合金发现,铁-沉物显著加快腐蚀. 和等合金元素通过在热加工过程中改变沉物形成来减轻这种影响.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀科学 腐蚀科学
- 金工业是金工业的一个方面.
背景情况:
- 合金容易腐蚀,影响其结构应用.
- 了解沉物形成对于提高合金性能至关重要.
- 热加工显著影响合金的微观结构和性能.
研究的目的:
- 为了研究作为挤出的Mg-0.5Zn(-0.2X) 合金的腐蚀性能.
- 为了比较as-extruded合金及其as-cast对应的腐蚀行为.
- 为了确定合金元素 (Ca, Sr, Ag, In, Cu) 和铁沉对腐蚀的影响.
主要方法:
- 挤出具有控制参数的Mg-0.5Zn(-0.2X) 合金.
- 作为挤出和作为造合金的腐蚀性能测试.
- 微结构分析以确定沉物类型和分布.
- 沉形成的热力学分析 (形成的度,电位差异).
主要成果:
- 在Z05,Z0502-Ag和Z0502-In合金中,Fe-Si沉加速腐蚀.
- 封装在铁中的MgCaSi(Fe) 和MgSrSi(Fe) 沉物在Z0502-Ca和Z0502-Sr.中显示出较弱的腐蚀驱动力.
- 存在Mg2Cu间金属的存在掩盖了Z0502-Cu.Cu中的Fe杂质的影响.
- 在热加工过程中,铁的沉会通过改变金属间和杂质分布,对腐蚀产生重大影响.
结论:
- 热加工期间的铁沉是微合金系统腐蚀性能的一个关键因素.
- 合金元素会影响沉物的形成和分布,从而影响耐腐蚀性.
- 形成的和电位差异是热力学关键因素,在热处理过程中控制沉物分布.
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