纳米化对Fe-20Cr合金在[Cl~-]=0.1 mol/L硼酸缓冲溶液中Cl-吸附行为的影响
Influence of Nanocrystallization on Adsorption Behavior of Cl~- on Fe20Cr Alloy in 0.1 mol/L Cl~- Borate Buffer Solution
查看参考文献26篇
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文摘
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应用X射线光电子能谱(XPS)和第一性原理计算的方法研究了纳米化对Fe20Cr合金在Cl~-浓度为0.1 mol/L的硼酸缓冲溶液中Cl~-吸附行为的影响。结果表明, Cr对Cl-吸附行为有两方面的影响: 根据理论计算结果, 随着界面处Cr元素含量的增加Cl~-的吸附能逐步降低, 易于Cl~-的吸附; 但是在实际环境中Cr含量的增大导致合金更易于形成Cr氧化物的钝化膜, 从而阻止Cl~-的吸附行为。纳米化加速了Cr元素的扩散行为, 导致Cr元素在钝化膜内及钝化膜/金属界面的富集。由此可见, 纳米化抑制了Cl~-吸附及在钝化膜内的扩散行为, 提高了钝化膜的耐蚀能力。 |
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其他语种文摘
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The effect of nanocrystallization on the adsorption of Cl~- on Fe20Cr alloy in [Cl~-] =0.1 mol/L borate buffer solution was investigated by means of X-ray photoelectron spectrum(XPS) and calculations per the first-principles. The results show that the influence of Cr on Cl~- adsorption behavior could be described as the following two aspects : the one, in view of the calculation per the first-principles, is that the adsorption energy decrease with the increasing Cr content at the interface of passive film/alloy, which is conducive to the adsorption of Cl~-; the other is that the Cr enrichment may also facilitate the formation of passivation film, which inhibit the Cl~- adsorption. Nanocrystallization may enhance the diffusivity of Cr, which leads to the enrichment of Cr within the passive film as well as at the interface of passive film/alloy. Thus, nanocrystallization can inhibit the adsorption and the inward migration of Cl~-, and finally enhance the corrosion resistance of the alloy. |
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来源
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材料研究学报
,2016,30(1):6-14 【核心库】
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DOI
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10.11901/1005.3093.2015.345
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关键词
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金属材料
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纳米化
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XPS
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第一性原理计算
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Fe20Cr合金
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Cl~-吸附
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地址
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1.
大连理工大学, 大连, 116024
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中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-3093 |
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学科
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化学 |
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基金
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国家自然科学基金
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国家973计划
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文献收藏号
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CSCD:5624139
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