Comparison on corrosion resistance and surface film of pure Mg and Mg-14Li alloy
Comparison on corrosion resistance and surface film of pure Mg and Mg-14Li alloy
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纯镁与Mg-14Li合金耐蚀性及表面膜层比较
DOI：
10.1016/s1003-6326(20)65388-2
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发表时间：
2020-09-01
影响因子：
4.5
通讯作者：
ZHANG, Peng
中科院分区：
文献类型：
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作者：
LI, Chuan-qiang;TONG, Zhi-pei;ZHANG, Peng
研究六方密实（HCP）纯Mg和体心立方（BCC） Mg-14wt不同的耐蚀性和表面膜类型。在0.1 mol/L NaCl中，对%Li合金进行了析氢、失重、现场电化学结合拉曼光谱测试和显微组织观察等一系列实验。结果表明，纯Mg的耐蚀性优于Mg- 14li，且在0.1 mol/L NaCl中浸泡16 h后，两种镁体系表面膜的保护功能均有所提高。通过扫描电镜（SEM）证实，Mg- 14li表面有一层铰接的、厚的、针状的含有Li2CO3的表面膜，不同于纯Mg表面典型的薄片状Mg(OH)(2)膜。然而，两种表面膜都可能在高阳极过电位下被击穿。因此，两种Mg体系的不同耐蚀性归因于其表面形成的不同保护膜。
To study different corrosion resistances and surface film types of hexagonal close-packed (HCP) pure Mg and body-centered cubic (BCC) Mg-14wt.%Li alloy in 0.1 mol/L NaCl, a series of experiments were conducted, including hydrogen evolution, mass loss, in-situ electrochemical testing combined with Raman spectroscopy and microstructural observation. The results indicate that the corrosion resistance of pure Mg is superior to that of Mg-14Li, and the protective function of the surface films on both magnesium systems is elevated within 16 h of immersion in 0.1 mol/L NaCl. An articulated, thick, and needle-like surface film containing Li2CO3 on Mg-14Li, different from the typically thin, flaky Mg(OH)(2) film on pure Mg, is confirmed via scanning electron microscopy (SEM). However, both surface films can be broken down at a high anodic over-potential. Thus, different corrosion resistances of the two Mg systems are ascribed to various protective films forming on their surfaces.