LASER RAMAN SPECTROELECTROCHEMICAL STUDIES OF ANODIC CORROSION AND FILM FORMATION ON IRON IN PHOSPHATE SOLUTIONS
LASER RAMAN SPECTROELECTROCHEMICAL STUDIES OF ANODIC CORROSION AND FILM FORMATION ON IRON IN PHOSPHATE SOLUTIONS
复制标题
DOI：
10.1016/0013-4686(89)87098-7
复制
发表时间：
1989-02-01
影响因子：
6.6
通讯作者：
TIPTON, T
中科院分区：
文献类型：
--
作者：
MELENDRES, CA;CAMILLONE, N;TIPTON, T
铁在不同pH的磷酸盐溶液中的循环伏安显示，铁在0.1M H3PO4和Na2PO4的酸性溶液中主要被活化溶解，而在碱性的0.1M Na2HPO4和Na3PO4中则完全被钝化。激光拉曼光谱分析表明，在后两种溶液中形成的腐蚀膜主要由Fe3O4组成，膜的晶格结构中含有PO43-−。在0.1M的NaH_2PO_4溶液中，形成多层膜。薄膜的主要成分似乎是Fe3(PO4)2·8H2O，俗称橄榄石。然而，观察到的几个拉曼光谱仍然没有被指认，因为它们与已知标准化合物的拉曼光谱不匹配。X射线衍射分析表明，相应的材料是高度无序或无定形的。
Cyclic voltammetry of iron in phosphate solutions of varying pH show mostly active dissolution in acid solutions of 0.1 M H3PO4and NaH2PO4; complete passivity is observed in alkaline 0.1 M Na2HPO4and Na3PO4. The composition of the corrosion film formed in the latter solutions was determined by laser Raman spectroscopy to consist mainly of Fe3O4with PO43−incorporated into the lattice structure of the film. In acid 0.1 M NaH2PO4, multilayer film formation occurs. The main component of the film appears to be Fe3(PO4)2·8H2O commonly known as vivianite. Several of the Raman spectra observed, however, remain as yet unassigned because they do not match those of known standard compounds. X-ray diffraction analyses indicate that the corresponding materials are highly disordered or amorphous.