Structure inhibited pit initiation in a Ni–Nb metallic glass
Structure inhibited pit initiation in a Ni–Nb metallic glass
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DOI：
10.1016/j.corsci.2009.12.014
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发表时间：
2010-04
影响因子：
8.3
通讯作者：
Zi Ming Wang;J. Zhang;X. Chang;W. Hou;J. Wang
中科院分区：
文献类型：
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作者：
Zi Ming Wang;J. Zhang;X. Chang;W. Hou;J. Wang
选择在失透过程中会发生多晶型转变的模型金属玻璃Ni 50 Nb 50，以阐明非晶结构与腐蚀的相关性。通过对非晶态合金和晶态合金的对比，详细研究了非晶态合金的电化学极化行为、膜击穿和表面膜的组成。有趣的是，发现相对于晶化样品，非晶样品的点蚀起始被大大抑制。其原因可能与钝化膜下的界面缺陷有关，钝化膜抑制了点蚀前体的形成。
A model metallic glass Ni50Nb50, which would undergo a polymorphous transformation during devitrification, was selected to clarify the correlation of amorphous structure with corrosion. The electrochemical polarization behaviour, film breakdown and composition of surface film have been studied in detail by comparing the amorphous alloy with its crystalline counterparts. Interestingly, it was found that the pit initiation is inhibited greatly on amorphous sample relative to the crystallized one. The origin is thought to be related to the defective interface beneath passive film that inhibits the formation of pitting precursors in corrosion.