Advances in Corrosion Science and Technology by John R. Weeks, Hugh S. Isaacs (auth.), Mars G. Fontana,

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

This sequence was once prepared to supply a discussion board for assessment papers within the zone of corrosion. the purpose of those studies is to deliver definite components of corrosion technology and expertise right into a sharp concentration. The volumes of this sequence are released nearly on a each year foundation and every comprises 3 to 5 reports. The articles in every one quantity are sekcted in this kind of manner as to be of curiosity either to the corrosion scientists and the corrosion technologists. there's, in reality, a specific target in juxtaposing those pursuits as a result of the value of mutual interplay and interdisciplinarity so vital in corrosion reports. it really is was hoping that the corrosion scientists during this method 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 experience. It comprises, as a result, not just the degradation of metals in aqueous en­ vironment but additionally what's as a rule known as "high-temperature oxidation. " extra, the plan is to be much more basic than those themes; the sequence will contain 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 has to be prolonged to liquid metals, a wide selection of gases, nonaqueous electrolytes, and different non­ aqueous liquids.

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Since these loops have no corrosion samples at < 150LjD, this observation is entirely consistent with Romano's results shown in Fig. 25. Wachtel and Chen 60 developed a computer program using the classical mass transfer formulation, to which they added a subroutine to describe the effect of particulates on the corrosion process. The basic assumptions used in these calculations, in addition to those inherent in the program, are as follows. (a) Particulates are uniformly dispersed throughout the Na.

11. Effect of oxygen on the selective leaching process. Schematic drawing. " Corrosion and Deposition in Liquid Sodium 21 from ""'3 up to 12 ppm, depletion of Cr and Ni decreases 48 in the hightemperature region. Zebroski et al. 43 ,47 have noted that the steady-state surface of stainless steel in Na containing'"'" 50 ppm oxygen is enriched in Ni and Cr and depleted in Fe. This behavior as sketched schematically by these authors is shown in Fig. II. Nickel-Base and Intermediate Alloys The early stages of the corrosion behavior of Ni-base alloys-the Inconels and Hastelloy N, for example-is somewhat different from that of the stainless steels.

If precipitation of solutes from the liquid metal is a more efficient process than dissolution, deposits will form only in the coldest portion of the mainstream circuit. l This "efficient precipitation" sets the steady-state concentration of dissolved solute in the liquid at approximately the solubility of the solute at the minimum mainstream temperature (or at a critical supersaturation level above the solubility at Tmin) and gives rise to massive deposits and the LlT effect. Since the corrosion rate is proportional to the term (So - S'), in which So is the solubility at the corroding temperature and S' the steady-state solute level, the corrosion rate at constant maximum temperature is increased as LlT is increased, or Tmin , and therefore S', are decreased.

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