Structure of Oxidation Film on Ignition-proof ZM5 Magnesium Alloys with MM （Mitschmetal） Addition

Li Huaji1; Deng Zhenghua1; Rao Jinsong1; Huang Rui1; Chen Jing2

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Structure of Oxidation Film on Ignition-proof ZM5 Magnesium Alloys with MM （Mitschmetal） Addition
Vol. 29, Issue 1, Pages: 5-7(2009)
Published： 2009 ，
DOI：

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[1]李华基,邓正华,饶劲松,黄锐,陈婧.混合稀土阻燃ZM5镁合金的氧化膜结构分析[J].特种铸造及有色合金,2009,29(01):5-7+7.

Li Huaji1, Deng Zhenghua1, Rao Jinsong1, et al. Structure of Oxidation Film on Ignition-proof ZM5 Magnesium Alloys with MM （Mitschmetal） Addition. [J]. Special Casting & Nonferrous Alloys 29(1):5-7(2009)
[1]李华基,邓正华,饶劲松,黄锐,陈婧.混合稀土阻燃ZM5镁合金的氧化膜结构分析[J].特种铸造及有色合金,2009,29(01):5-7+7. DOI：

Li Huaji1, Deng Zhenghua1, Rao Jinsong1, et al. Structure of Oxidation Film on Ignition-proof ZM5 Magnesium Alloys with MM （Mitschmetal） Addition. [J]. Special Casting & Nonferrous Alloys 29(1):5-7(2009) DOI：

摘要

通过添加0.1%的混合稀土（RE）到ZM5镁合金中

镁合金的起燃温度可提高约206℃

针对这种合金

利用SEM-EDS和X射线衍射分析表明

在高温下

该合金表面生成了一层由（RE）2O3（混合稀土氧化物）、MgO、Al2O3、Mg17Al12组成的致密氧化膜

混合稀土具有明显的表面富集现象;通过热力学研究氧化膜的形成过程发现

RE与MgO发生交互反应

使中间层的（RE）2O3增加

导致中间层致密度增加

从而起到阻燃的效果。

Abstract

Ignition point of ZM5 magnesium alloy with 0.1%MM addition can be increased by approximately 206℃. Microstructure of the ZM5 magnesium alloy with 0.1% MM addition was observed by SEM （scanning electron microscope）

EDS (energy dispersive spectrum and XRD （X-ray diffraction）. The results indicate that compact oxidation film composed of RE2O3

MgO

and Mg17Al12 phase is created on the surface of the ZM5 magnesium alloy

on which MM exhibits obvious enrichment. Thermodynamic analysis of the forming process of oxide film reveals that interaction between RE and MgO can increase the RE2O3 content in middle layer

resulting in the improvement of compactness of middle layer

which is responsible for the improvement of ignition-proof effects of ZM5 magnesium alloy.