Oxygen corrosion identification

Kotz R, Stucki S, Scherson D, Kolb DM (1984) In-situ identification of Ru04 as the corrosion product during oxygen evolution on ruthenium in acid media. J Electroanal Chem 172(1) 211-219... 

In characterizing HTC, X-Ray Diffraction is a very useful and reliable technique for indexing patterns of phases leading to phase identification in the corrosion product known as surface scale. In fact, this high temperature phenomenon is different from the mst layer formation (in the presence of moisture) since it virtually occurs in dry gaseous environments or molten salts, hi certain cases, HTC may be an internal oxidation process when oxygen diffusion is faster than the surface oxidation rate. 

Identification of localized corrosion The attack was due to crevice corrosion. The rolled joint was not very tight, and, therefore, the steam condensate penetrated into the gap. A differential aeration cell was formed due to the depletion of oxygen in the crevice formed by the rolled joint because of its not being tight. 

Oxygen is the most relevant nonmetallic element that can be dissolved in both liquids, Pb and Pb-Bi (Fig. 2.5), and that impacts the corrosion of structural materials in the liquid metals. Therefore, hereafter the solubility limits of oxygen as reported in the open literature are reported. When the solubility limits are exceeded, both in liquid Pb and liquid Pb-Bi solids oxides are formed. The identification of the optimal oxygen content in liquid Pb or Pb-Bi, as will be discussed in section 2.4, is very important in order to minimize corrosion degradation issues. 

The following example deals with the spectroscopic identification of corrosion products which are generated during the oxygen evolution on Ru... 

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