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Laser raman spectroelectrochemical studies of anodic corrosion and film formation on iron in phosphate solutions

✍ Scribed by C.A. Melendres; N. Camillone III; T. Tipton

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 504 KB
Volume: 34
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(89)87098-7

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✦ Synopsis

Cyclic voltammetry of iron in phosphate solutions of varying pH show mostly active dissolution in acid solutions of 0.1 M H,PO, and NaH,PO,; complete passivity is observed in alkaline 0.1 M Na,HPO, and Na,PO,. The composition of the corrosion film formed in the latter solutions was determined by laser Raman spectroscopy to consist mainly of Fe304 with PO:-incorporated into the lattice structure of the film. In acid 0.1 M NaH,PO,, multilayer film formation occurs. The main component of the film appears to be Fe~(PO.&.SH,O 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.

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