By John R. Weeks, Hugh S. Isaacs (auth.), Mars G. Fontana, Roger W. Staehle (eds.)
This sequence was once equipped to supply a discussion board for overview papers within the quarter of corrosion. the purpose of those stories is to carry yes components of corrosion technology and know-how right into a sharp concentration. The volumes of this sequence are released nearly on a every year foundation and every comprises 3 to 5 experiences. The articles in each one quantity are sekcted in this sort of method as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, in reality, a selected goal in juxtaposing those pursuits as a result significance of mutual interplay and interdisciplinarity so vital in corrosion reports. it really is was hoping that the corrosion scientists during this means might remain abreast of the actions in corrosion know-how and vice versa. during this sequence the time period "corrosion" is utilized in its very broadest experience. It comprises, accordingly, not just the degradation of metals in aqueous en vironment but in addition what's in most cases often called "high-temperature oxidation. " additional, the plan is to be much more basic than those subject matters; the sequence will comprise all solids and all environments. this day, engineering solids contain not just metals yet glasses, ionic solids, polymeric solids, and composites of those. Environments of curiosity needs to be prolonged to liquid metals, a wide selection of gases, nonaqueous electrolytes, and different non aqueous liquids.
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Extra info for Advances in Corrosion Science and Technology
Basic to this model is the assumption that the presence of either nickel or chromium metals gives rise to the downstream effect in high-velocity sodium. This aspect of the mechanism suggests that a marked difference should be Corrosion and Deposition in Liquid Sodium 51 observed in the corrosion behavior of pure iron (which should show no downstream effect) and that of stainless steels (which does). The Corrosion of Pure Iron The reaction by which iron dissolves in sodium involves (1) an iron atom in the iron lattice, (2) the adsorption of the iron atom on the iron surface, (3) the diffusion of the iron atom on the iron surface to an active site, (4) the desorption of the iron atom from an active site and its dissolution in the sodium adjacent to the iron, and (5) the diffusion of the iron atom in sodium from the interface to the bulk sodium.
FeactJ} (31 ) The Corrosion of Stainless Steel in Sodium During the initial stages of the corrosion of stainless steel in sodium containing low concentrations of oxygen « 30 ppm), it has been observed that chromium and nickel are preferentially leached leaving a high concentration of iron on the surface. The concentration profile of nickel and chromium below the surface appears to remain constant with time once steadystate conditions are reached. In the downstream corrosion specimens, the thickness of the leached layer decreases and the concentration profile changes.
During this same rlln the corrosion rate decreased by a factor of",-, 2i in going from L/D = 200 to L/D = 600. In the BNL loops,42 most of the corrosion specimens are in the rising temperature region with only a short isothermal downstream section (up to 80L/D) at 760°C. The steady-state corrosion data for type 316 SS in this system are shown in Fig. 19. It is apparent that during the first 80L/D, the drop in corrosion rate is parabolic, or proportional to (LI D)2, as shown in Fig. 20. It is not clear at present whether this proportionality to (L/D)2 is coincidental and reflects merely a transition state, or whether the linear proportionality to L/ D from the data of Roy et al.
Advances in Corrosion Science and Technology by John R. Weeks, Hugh S. Isaacs (auth.), Mars G. Fontana, Roger W. Staehle (eds.)