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  • Wiley-Blackwell  (2)
  • Taylor & Francis
  • 2000-2004
  • 1975-1979  (2)
  • 1965-1969
  • 1976  (2)
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  • 2000-2004
  • 1975-1979  (2)
  • 1965-1969
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  • 1
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Untersuchungen zur Lochkorrosion des Stahls Delta-52 in wässerigen Lösungen. -2. Änderung des Lochkorrosionspotentials in Abhängigkeit von der Konzentration des angreifenden AnionsDie potentiodynamischen anodischen Polarisationskurven wurden für eine Elektrode aus dem Stahl Delta-52 (0, 40, C, 0, 78Mn, 0, 045S, 0, 06p, 0, 23Si) aufgenommen; als Prüflösung diente verdünntes KOH mit und ohne Zusatz von Kaliumchlorid, -bromid und -jodid. Der auf dem Stahl vorhandene Oxidfilm beeinflußt die aktive Auflösung nicht, erst bei Potentialen über+2 V (ges. Calomal) tritt Passivität auf. Das Polarisationsverhalten des Stahls wird durch Zusatz der Halidionen nicht beeinflußt; oberhalb einer bestimmten Konzentration der Halide nimmt jedoch der Auflösungsstrom plötzlich steil zu, was auf den Beginn von Lochkorrosion hinweist; zwischen dem Lochkorrosionspotential und der Konzentration der Anionen besteht eine eindeutige Beziehung.
    Notes: Potentiodynamic anodic polarization curves have been traced for an electrode of the steel Delta-52 (0.40, 0.78Mn, 0.045 S, 0.06P, 0.23 Si): the aggresive media used were potassium hydroxide without and with additions of potassium chloride, bromide and iodide. The oxide film present on the steel surface does not inhibit active dissolution; only at potentials exceeding+2 (S. C. E.) passivity sets in. The polarization behaviour of the steel is not influenced by the addition of the halide salts; above a certain salt concentration, however, there is a sharp increase in dissolution current. This phenomenon is an indication of the start of pitting. Between the pitting potential and the anion concentration there exists a well defined relation.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low-temperature heat capacity of collagen (in the hydrated and dehydrated states) and the large entropy of collagen in the coiled state relative to the same protein in the helical state were investigated. The heat capacity for collagen in the solid state in the temperature range 4°-50° K changes proportionally to the square of temperature (Cp ∼ T2). Above 50°K there is a linear dependence (Cp ∼ T). The differences in the character of temperature dependence of heat capacity for the hydrated and dehydrated collagen show the importance of the specific interaction of water molecules with polypeptide chains of this protein. The peculiarities of the temperature dependence of the heat capacity difference (ΔCp) of hydrated denatured (random coiled) and hydrated native (helical) collagen are observed at 15°, 120°, and 240°K. These differences are caused by the varying degree of ordering of the hydrate water molecules in native and denatured collagen macromolecules. At all temperatures (4°-300°K) the entropy of the random coiled state is higher than that of collagen in the native state and at 298°K ΔS0298 = ∫0298 (ΔCp/T)dT = 0.8 cal/100 g °K.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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