Iron wetting behavior

In the last few decades, a considerable number of experimental studies have been carried out to determine partitioning of the candidate light elements between core and mantle at relevant pressures, temperatures, compositions, and redox conditions. The effects of light elements on the wetting behavior of liquid iron-alloy with respect... 

Figure 11 Wetting behavior of iron-Ught-element alloys, (a) Effect of bght element on surface tension at 1 bar (lida and Guthrie, 1988). (b) Effect of light elements on dihedral angle at 3-4 GPa (Minarik et at., 1996). (c) Effect of pressure on dihedral angle of Fe-Ni-S melt in equilibrium with mantle minerals (olivine, )8-phase, and y-phase below 25 GPa, magne-siowustite, perovskite, and y-spinel at 25 GPa, Shannon and Agee (1998)).

Behavior toward metals TeNA, whether wet or dry, did not attack steel, iron, tin, copper, brass, lead, aluminum or zinc in 14... 

The scope of the present paper is to emphasize the role of wetting and spreading in the aging by sintering, and in the redispersion of supported metal catalysts. In the next section, some experimental results regarding the behavior of iron supported on alumina are presented to demonstrate that surface phenomena do play a major role. This is followed by stability considerations which are employed to explain the coexistence of multilayer surface films with crystallites in an oxygen atmosphere and the rupture of thin films into crystallites in a hydrogen atmosphere. 

The reactions are of either liquid-gas (wet) or solid-gas (dry) type. Dry processes show high reaction rates enabling compactness, but a poor heat and mass transfer behavior compared with wet processes [19]. The examples of the 2-propanol - acetone system [44, 56], the cyclohexane-benzene system [31], the hydride system [30], and the sponge iron system [54] are given in more detail in appendix C. 

It is worth mentioning that at 0.6 M NaCI concentration for 46 days, the corrosion rate for CS and WS were of 3l00 xm per year and 3686 xm per year, respectively. For comparison purposes, it is possible to see that the performance of both steels in such aggressive environments of high chloride content is very poor, but it is even three to five times worse than in the case of total immersion tests. These corrosion rates seem to be inversely related to the iron conversion factor, which is lower (about 0.21) in the immersion tests than in the dry-wet tests (about 0.80). The different behaviors should be related to the type of iron phases, their characteristics, and their relative amounts. 

---