By D. Chatterji, R. C. DeVries, G. Romeo (auth.), Mars G. Fontana, Roger W. Staehle (eds.)
This sequence was once equipped to supply a discussion board for assessment papers within the quarter of corrosion. the purpose of those studies is to carry definite components of corrosion technological know-how and expertise right into a sharp concentration. The volumes of this sequence are released nearly on a every year foundation and every includes 3 to 5 experiences. The articles in each one quantity are chosen in one of these manner as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, in reality, a selected target in juxtaposing those pursuits as a result of significance of mutual interplay and interdisciplinarity so very important in corrosion experiences. it truly is was hoping that the corrosiori scientists during this manner may perhaps remain abreast of the actions in corrosion expertise and vice versa. during this sequence the time period "corrosion" is utilized in its very broadest experience. It contains, hence, not just the degradation of metals in aqueous en vironment but additionally what's usually known as "high-temperature oxidation. " additional, the plan is to be much more normal than those subject matters; the sequence will comprise all solids and all environments. this day, engineering solids comprise not just metals yet glasses, ionic solids, polymeric solids, and composites of those. Environments of curiosity needs to be prolonged to liquid metals, a large choice of gases, nonaqueous electrolytes, and different non aqueous liquids.
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Additional info for Advances in Corrosion Science and Technology: Volume 6
Effect of pack porosity on the amount of coating deposited on an Fe-based alloy CRM-15D at 1000"F for 10hr. 65 important factor (Fig. 14). Brill-Edwards and Epner noticed, however, that at high temperatures, the porosity had little influence on the deposition rate. Brill-Edwards and Epner found that the microstructural features of the substrate surface had significant influence on the deposition process. The nonuniform coatings obtained at low temperatures (near 1200°F or 650°C) showed the following characteristic features: (a) grain centers and phase boundaries were the preferential sites for deposition; (b) deposition on secondary carbides was minimal even after long times; (c) gross variations were present in the thickness of the deposit.
Chemical diffusion coefficients for Ni-Aluminide phases. 54 1. Analysis of layer growth data from all of the above-mentioned couples indicated volume diffusion as the rate controlling process in each case. 2. No concentration dependence of the diffusion coefficients could be determined from the layer growth experiments, probably because exact concentration profiles within the different phases could not be obtained. 3. A considerable deviation was found between the value of Vi) for y'-AI and Ni-AI couples and the value for Vi) for P-Al couples for unknown reasons.
An activity gradient is thus set up in the immediate vicinity of the alloy surface and it in turn sets up an Al flux to the alloy. If diffusion is slow in the gas phase and fast in the aluminide phase, a boundary layer develops, increases in thickness for a while, and then assumes a steady-state value. The model of Levine and Caves allows the calculation of the steadystate Al flux across this boundary layer and shows that an integration of this Protection of Superalloys for Turbine Application 41 instantaneous flux yields the total weight gain by the alloy with reasonable accuracy for iodide- and bromide-activated packs.