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

This sequence was once geared up to supply a discussion board for evaluation papers within the region of corrosion. the purpose of those studies is to convey definite 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 includes 3 to 5 stories. The articles in every one quantity are chosen in this type of approach 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 due to the value of mutual interplay and interdisciplinarity so vital in corrosion experiences. it's was hoping that the corrosion scientists during this method could 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 feel. It contains, hence, not just the degradation of metals in aqueous en­ vironment but in addition what's regularly known as "high-temperature oxidation. " additional, the plan is to be much more normal than those issues; the sequence will contain 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 needs to be prolonged to liquid metals, a wide selection of gases, nonaqueous electrolytes, and different non­ aqueous liquids.

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The authors found a simple linear relationship between internal compressive stress and film thickness on zirconium, although the stresses in oxides on Zircaloy-2 increased rapidly to a maximum coinciding with the transition in oxidation kinetics. This result suggests that the transition from a parabolic to a linear rate la w is caused by the mechanical breakdown of the protective oxide at some critical film thickness. Howes and Richardson 1oo have examined iron-chromium alloys, Surface Oxide Films at Elevated Temperatures 39 again using the bending foil technique.

83 found that stressing an AI-Cu-Mg alloy in tension during anodizing resulted in a greatly extended fatigue life of the alloy, whereas stressing the alloy in compression during anodizing slightly reduced fatigue life. This is relevant, because if failure of an oxidized component under fatigue initiates at the surface, and propagation of the fatigue crack is rapid, it can be deduced that fracture of the oxide can be delayed when the oxide is in compression. The effect of environment observed by Grosskreutz 81 was again confirmed using this technique and, for example, the presence of high concentrations of water vapor in the environs of the fatigued specimen reduced fatigue life considerably.

However, the most important aspect of these results is that the creep rate is dependent upon oxide stoichiometry. It has been shown that changes in stoichiometry also affect the mechanical properties of rutile (Ti0 2 ). Hollox and Smallman 68 have shown that the yield point increases with oxygen ion vacancy concentration and Hirthe and Brittain 69 have shown that the creep rate of rutile can change by two orders of magnitude by changes in stoichiometry, as shown by Fig. 21. Seltzer et al. have shown that in uranium dioxide (U0 2 +x) the creep of both single-crystaFO and polycrystalline 71 oxide increases with increasing oxygen excess.

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