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01149 OXIDATION OF IRON IN 288°C, OXYGEN-CONTAINING WATER

Product Number: 51300-01149-SG
ISBN: 01149 2001 CP
Author: Christopher S. Kumai and Thomas M. Devine
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In situ Raman spectroscopy, surface enhanced Raman spectroscopy, scanning electron microscopy and measurements of corrosion potential were used to investigate the films formed on iron in 288°C water with dissolved oxygen concentrations that ranged from 0 to 208 ppb. A double layer film of Fe304 that consists of an inner, conformal layer and an outer layer of faceted, loosely packed particles forms in water containing 0 to 22 ppb oxygen. Passivation of the iron surface begins at dissolved oxygen concentrations of = 8 ppb and is a two step process: first, between 8 and 22 ppb oxygen, there is an increase in protectiveness of the Fe304 and second, between 22 and 53 ppb the outer surface of Fe304 transforms to ~-Fe203, which completes passivation.

Keyword: Oxidation, Raman Spectroscopy, SERS, Iron, Passive Film
In situ Raman spectroscopy, surface enhanced Raman spectroscopy, scanning electron microscopy and measurements of corrosion potential were used to investigate the films formed on iron in 288°C water with dissolved oxygen concentrations that ranged from 0 to 208 ppb. A double layer film of Fe304 that consists of an inner, conformal layer and an outer layer of faceted, loosely packed particles forms in water containing 0 to 22 ppb oxygen. Passivation of the iron surface begins at dissolved oxygen concentrations of = 8 ppb and is a two step process: first, between 8 and 22 ppb oxygen, there is an increase in protectiveness of the Fe304 and second, between 22 and 53 ppb the outer surface of Fe304 transforms to ~-Fe203, which completes passivation.

Keyword: Oxidation, Raman Spectroscopy, SERS, Iron, Passive Film
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