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

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 evaluate papers within the quarter of corrosion. the purpose of those stories is to deliver convinced parts of corrosion technology 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 any such manner as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, actually, a specific goal in juxtaposing those pursuits as a result of the value of mutual interplay and interdisciplinarity so vital in corrosion reviews. it truly is was hoping that the corrosion scientists during this manner may possibly 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 contains, for that reason, not just the degradation of metals in aqueous en­ vironment but in addition what's mostly known as "high-temperature oxidation. " extra, the plan is to be much more common than those subject matters; the sequence will comprise all solids and all environments. at the present time, 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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Extra info for Advances in Corrosion Science and Technology: Volume 4

Example text

The axial extension increased with time of oxidation but extension ceased after long times, implying that the stresses in the oxide gradually diminished. Similar extensions were observed on oxidized thin plates, and winding up of helices was reported as on iron. 14 The closure of the right angle in L-shaped specimens due to surface oxide stresses was also noted. 3 MN/m2 at lOOO°e. This stress was attributed to grain boundary pressure within the columnar oxide grains, as described in an earlier section.

29 Surface Oxide Films at Elevated Temperatures 4 2 105 6 4 ~ 2 "u w ~10-6 o w I- ~ 6 a. 1(108) DYNES CI>{~, 2·4(108) DYNES CM , 1l4·1 (l08) DYNES CM~ 24 (lOS) DYNES C~ + o 2 ~ ~167 e e e l000 0 lOOOoe 900 0 9000 i5 0( W I- (J') 10 10 OXYGEN VACANCY 1 CONCENTRATION 10 (CM-3) 1()21 Fig. 21. Steady-state creep rate relationship with defect concentration for rutile (Ti02 ) (after Hirthe and Brittain 69 ). These researches show clearly that the mechanical properties of oxides are highly dependent upon the stoichiometry of the oxide and an excellent review of work in this field has recently been made by Clauer et al.

The rate of oxidation of the cylinder whose inner surface only was oxidizing (the other surface was clad with gold foil) was greater than the rate for the cylinder whose outer surface was oxidizing. Hence the oxidation rate was found to be greater when the oxide was und~r elastic compressive stress than when it was under elastic tension. However, the effects of curvature during oxide growth (as discussed earlier), oxide plasticity, and growth of CuO whiskers on Cu 2 0 cause the problem to be much more complex than the authors suggest, particularly since there is not a great difference in observed oxidation rates.

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