By John R. Weeks, Hugh S. Isaacs (auth.), Mars G. Fontana, Roger W. Staehle (eds.)

This sequence used to be equipped to supply a discussion board for overview papers within the zone of corrosion. the purpose of those stories is to convey definite components of corrosion technological know-how and expertise right into a sharp concentration. The volumes of this sequence are released nearly on a each year foundation and every includes 3 to 5 studies. The articles in each one quantity are sekcted in this type of means as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, in truth, a specific target in juxtaposing those pursuits as a result significance of mutual interplay and interdisciplinarity so vital in corrosion reviews. it truly is was hoping that the corrosion scientists during this means may perhaps 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 more often than not often called "high-temperature oxidation. " extra, the plan is to be much more basic than those themes; 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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Type 321 stainless steel has a steeper temperature dependence than type 304 at both oxygen levels. Although only two points are shown on the BNL curves, each one is a mean of many individual specimens, as shown for type 316 SS in Fig. 19. It is difficult to select which of these temperature dependences to use in an evaluation of the activation energy for the corrosion process. Since the BNL data are the only ones known to have been obtained both at zero downstream and in the velocity-independent region, these will be used in further discussions of the corrosion mechanism.

The concentration Si of Fe in the Na can then be estimated at each point from the sum of the corrosions that occurred at each point upstream of point i. Corrosion Models Developed by Epstein and Co-Workers Such an approximation for k Fe has been proposed by Epstein 2 for the cases in which the rate-controlling step is liquid-phase diffusion of Fe through the boundary layer or is dissolution into the liquid in the boundary layer. Using a heat-transfer analogy for the rate of mass transfer in grams/ unit time, R T , in a liquid-phase diffusion-controlled system he gives (17) in which D is the diffusion coefficient of the solute in the liquid metal, d is the diameter of the tube, v is the flow velocity, v is the kinematic viscosity, So is the solubility, and LIT is the (small) temperature differential in the circuit.

13 attempted to explain the oxygen effect on the basis that the metal surface is oxygen-starved, so that boundary-layer diffusion of available oxygen from the Na was the rate-controlling step at v> Vc' Although this explanation was satisfactory with the data available at the time, Isaacs's58 results on oxygen migration in Na indicate that this model is incorrect. Also, the oxygen-diffusion model predicts that Vc should approach zero as the oxygen concentration increases, whereas, from the results of Thorley and Tyzack,16 this does not appear to be the case.

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