Download Advances in Corrosion Science and Technology: Volume 4 by P. Hancock, R. C. Hurst (auth.), Mars G. Fontana, Roger W. PDF

By P. Hancock, R. C. Hurst (auth.), Mars G. Fontana, Roger W. Staehle (eds.)

This sequence was once prepared to supply a discussion board for evaluate papers within the zone of corrosion. the purpose of those studies is to carry convinced parts of corrosion technological know-how 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 every one quantity are chosen in the sort of manner as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, in truth, a specific objective in juxtaposing those pursuits a result of value of mutual interplay and interdisciplinarity so vital in corrosion reports. it really is was hoping that the corrosion scientists during this means may possibly remain abreast of the actions in corrosion expertise and vice versa. during this sequence the time period "corrosion" is utilized in its very broadest feel. It comprises, consequently, 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 common than those themes; the sequence will comprise all solids and all environments. this present day, engineering solids contain not just metals yet glasses, ionic solids, polymeric solids, and composites of those. Environments of curiosity has to be prolonged to liquid metals, a wide selection of gases, nonaqueous electrolytes, and different non­ aqueous liquids.

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Additional resources for Advances in Corrosion Science and Technology: Volume 4

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Preoxidized specimens were strained in a simple bend test and oxide fracture was detected by a change in current of an electrolytic cell, by Harrison. 3 % 34 P. Hancock and R. C. Hurst were measured, which are similar to those for bulk oxides. However, later work by Harrison (quoted in Ref. 08% at 300°C in tension, but strains of 5% were possible in compression. However, both the surface and bulk oxides of magnetite examined were extremely porous and these results may be expected for oxides of similar structure.

A discontinuous stress measuring technique, which overcomes the influence of curvature on oxidation, is to oxidize a foil and then remove one side of the oxide, causing the foil to bend. accodine and Schlege1. 102 The authors extended the investigation by dissolving some metal away from the back of the oxide, leaving an unsupported "window" of oxide. This area was air-pressurized and the deformation of the oxide observed, which enabled the mechanical properties of the oxide to be determined. The authors concluded that for this system all the measured stress was induced by cooling and that this stress was probably much greater than isothermally induced stresses.

The bending strip method was first applied to the oxidation of a metal by Dankov and Churaev95 in a modified form. They oxidized a thin, vapordeposited metal on a mica substrate and found that the bending of the mica was indicative of compressive stresses in both FeO and NiO and tensile stresses in MgO, as would be expected from Pilling-Bedworth ratio considerations. Bradhurst and Leach 77 measured the current density dependence of bending stress during the anodizing of aluminum foils. The measured stress was less than that predicted solely by Pilling-Bedworth ratio, although this may be expected for anodized films where both anionic and cationic diffusion may be occurring simultaneously.

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