Aqueous corrosion behaviour of Fe–Ni–B metal glasses
Aqueous corrosion behaviour of Fe–Ni–B metal glasses
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DOI：
10.1016/j.jallcom.2008.07.217
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发表时间：
2009-08
影响因子：
6.2
通讯作者：
A. Lekatou;A. Marinou;P. Patsalas;M. Karakassides
中科院分区：
文献类型：
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作者：
A. Lekatou;A. Marinou;P. Patsalas;M. Karakassides
用动电位极化、计时电流法和拉曼光谱研究了Fe-40Ni-20B(at%)非晶薄带在25°C 7N NaOH和3.5%NaC l中的腐蚀行为。在7N氢氧化钠中浸泡会导致多阶段钝化/伪钝化，这与相继形成以Fe_3O_4、Ni(OH)_2/NiO、Fe_2O_3/Fe_2O_3、Ni(OH)_2·2NiOOH和βNiO为基础的(Ni，Fe)化合物有关。Fe3O4、NiO、Fe2O3和βNiOOH是真正的钝化产物。虽然环境中的碳酸盐离子已经渗透到钝化膜中，但玻璃在7N NaOH中不容易点蚀。尽管无定形，玻璃在7N氢氧化钠中的行为是由其结晶金属成分的行为决定的。在3.5%的氯化钠溶液中，合金对局部腐蚀表现出轻微的敏感性。
The corrosion performance of Fe–40Ni–20B (at%) amorphous ribbons in 7N NaOH and 3.5% NaCl, at 25°C, is investigated by potentiodynamic polarization, chronoamperometry and Raman spectroscopy. Immersion in 7N NaOH induces a multiple stage passivation/pseudopassivation, which is associated with the successive formation of (Ni,Fe) compounds based on Fe3O4, Ni(OH)2/NiO, FeOOH/Fe2O3, Ni(OH)2·2NiOOH and βNiOOH. Fe3O4, NiO, Fe2O3and βNiOOH are responsible for true passivity. Although carbonate ions from the environment have penetrated the passive film, the glass is not susceptible to pitting in 7N NaOH. Despite amorphicity, the glass behaviour in 7N NaOH is governed by the behaviour of its crystalline metallic constituents. The alloy exhibits a slight susceptibility to localized corrosion, in 3.5% NaCl.