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  • 1
    Electronic Resource
    Electronic Resource
    Application of the Polarization Resistance Method to the Study of Lead Corrosion in Sulphuric Acid (1975)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 758-764 
    Details
    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: Anwendung der Polarisationswiderstands-methode zur Untersuchung der Korrosion von Blei in SchwefelsäureDie Geschwindigkeit der Korrosion und ihre zeitliche Entwicklung wurden an Bleilegierungen in konzentrierter heißer Schwefelsäure mittels Polarisationswiderstandsmessungen untersucht. Bei den Legierungen mit Fähigkeit zu Selbstpassivierung und Aufrechterhaltung des passiven Zustandes unter den Versuchsbedingungen ist es möglich. aufgrund der elektrochemischen Meßwerte genaue Angaben über die zu erwartende Korrosion zu machen. Andererseits gibt es spezifische Probleme bei den Bleilegierungen, deren Korrosionspotential alterierend zwischen Aktiv- und Passivzustand wechselt. Trotzdem ist es bei gewissen Modifizierungen der Methode moglich, die Polarisations-widerstandsmessung auch unter diesen Bedingungen einzusetzen, wobei natürlich die Genauigkeit geringer ist als im Falle der Legierungen mit stabiler Passivität. Aufgrund der Versuchsergebnisse definieren die Autoren verschiedene Mechanismen für die Korrosion der Bleilegierungen in Schwefelsäure.
    Notes: The corrosion rates and their evolution with time of lead alloys in hot-concentrated sulphuric acid have been evaluated through polarization resistance measurements. For the case of alloys capable of being self-passivated and of retaining the passive state under the exposure conditions, accurate corrosion rates can be predicted from the electrochemical data. On the other hand, some special problems are associated with the application of the polarization method to lead alloys with exhibit alternating changes of corrosion potential between an active and a passive state. Nevertheless, the method, with some slight modifications, continues to be effective for determining corrosion rates although to a lesser degree of accuracy than with stable alloys. On the basis of the results obtained, the different mechanisms of lead alloy corrosion in sulphuric acid are outlined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19750261003
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  • 2
    Electronic Resource
    Electronic Resource
    Oxidation der Pb-Ca-Legierungen in flüssigem Zustand (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 815-820 
    Details
    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: Oxidation of PbCa alloys in the liquid stateThe effect of various temperatures, the composition of the alloy and the corroding atmosphere is studied with a thermobalance during the oxidation of molten PbCa alloys. The rate controlling step of the oxidation depends on the test conditions. The results obtained at 700°C are in agreement with data found in literature and according to which the oxidation increases with the Ca content; in this range calcium is subject to preferential oxidation. At 600°C and temperatures below that the addition of calcium does not only not increase oxidation but may give rise to a decrease.
    Notes: Mit einer Thermowaage wird die Wirkung verschiedener Temperaturen, der Zusammensetzung der Legierung und der Zusammensetzung der angreifenden Atmosphäre bei der Oxidation geschmolzener Pb-Ca-Legierungen untersucht. Der geschwindigkeitsbestimmende Schritt der Oxidation hängt von den Versuchsbedingungen ab. Bei 700°C bestätigen die bei der vorliegenden Untersuchung erhaltenen Ergebnisse die Literaturangaben, wonach die Oxidation bei zunehmendem Ca-Gehalt ansteigt; dabei wird das Calcium vorzugsweise oxidiert. Dagegen wird bei 600°C und darunter die Oxidation durch Zusatz von Calcium nicht nur nicht verstärkt, sondern sogar verringert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780291206
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the instantaneous rate of atmospheric corrosion (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 456-460 
    Details
    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: Bestimmung der momentanen Geschwindigkeit der atmosphärischen KorrosionEs wurde versucht, die Anwendbarkeit der Methode von Stern (Polarisationswiderstand) zur Ermittlung der momentanen atmosphärischen Korrosion zu bestimmen. Die bisher ausgeführten Untersuchungen zeigen gute Übereinstimmung zwischen den elektrochemisch ermittelten Daten über den Einfluß verschiedener Korrosionsfaktoren und der tatsächlichen Wirkung dieser Faktoren auf den Angriff von Metallen bei Bewitterung.
    Notes: An attempt has been made to determine the applicability of Stern's (or polarisation resistance) method for obtaining a reliable evaluation of the instantaneous rate of atmospheric corrosion.The tests carried out so far have revealed a good agreement between electrochemically obtained information on the influence of various corrosion factors and their real effect on the attack of metals when exposed to the atmosphere.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780290705
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  • 4
    Electronic Resource
    Electronic Resource
    Quantitative measurements of corrosion rate of reinforcing steels embedded in concrete using polarization resistance measurements (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 515-519 
    Details
    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: Quantitative Messung der Korrosionsgeschwindigkeit von Bewehrungsstahl in Beton mit Hilfe der PolarisationswiderstandsmessungAlle bisherigen Methoden zur Bestimmung der Korrosionsgeschwindigkeit von Bewehrungsstahl in gehärtetem Beton waren destruktiv und erforderten beträchtlichen Zeit- und Materialaufwand, wodurch eine umfassende Untersuchung dieser Korrosionserscheinungen erklärt wurde. Bei Verwendung der Polarisationswiderstandsmethode wurde an in gehärtetem Beton eingebetteten Stangen, wobei die Proben in gesättigter Calciumhydroxidlösung gelagert wurden, eine annehmbare Übereinstimmung zwischen den gravimetrisch und elektrochemisch ermittelten Gewichtsverlusten gefunden.
    Notes: Up to this time all the methods to measure the corrosion rate of reinforcing steels embedded in hardened concrete have been of the destructive type, which requires much time and materials and makes the full scale study of the phenomenon difficult. The authors have applied the polarization resistance method to bars embedded in hardened mortar and immersed in Ca(OH)2-saturated solution, and have found an acceptable agreement between the gravimetric and the electrochemical weight loss data.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780290804
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  • 5
    Electronic Resource
    Electronic Resource
    Polyanhydride-imides (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 55 (1976), S. 85-96 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Acht Imid-dicarbonsäuren wurden aus Trimellitsäureanhydrid, Pyromellitsäureanhydrid und verschiedenen aliphatischen Aminocarbonsäuren (HOOC—(CH2)n—NH2, n = 1,2,3,5) synthetisiert.Die entsprechenden Copolyimid-anhydride wurden nach den üblichen Methoden in Anwesenheit von Essigsäureanhydrid hergestellt1,2.Die Copolyimide haben eine aliphatisch-aromatische Struktur; ihre Eigenschaften wurden in Abhängigkeit der Struktur untersucht und durch IR-Spektren, Elementaranalyse und viskosimetrische Messungen charakterisiert. Löslichkeit, Hydrolysierbarkeit und Wärmestabilität wurden bestimmt.
    Notes: Eight imide-diacids were synthesized from trimellitic anhydride, pyromellitic anhydride and aminoacids of the formula HOOC—(CH2)n—NH2, with n = 1,2,3,5. From them, polyanhydride-imides were obtained following a general method of formation of polyanhydrides in the presence of acetic anhydride1,2.These co-polyimides have an aliphatic-aromatic structure and the relation between the general properties and the amount of the aliphatic part in the repeat unit was studied. IR spectroscopy, elemental analysis and viscosity measurements were used for the characterization. Studies of solubility, hydrolysis resistance and thermal properties were also made.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050550107
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  • 6
    Electronic Resource
    Electronic Resource
    Rheological and thermal properties of a commercial liquid-crystalline polyesteramide (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1533-1550 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A commercial main-chain liquid-crystalline, naphthalene-based polyesteramide, was studied by three experimental techniques: extrusion capillary rheometry, dynamic viscoelasticity, and differential scanning calorimetry (DSC). From capillary rheometry a maximum at 360°C was observed in viscosity temperature curve. This result is compared with literature data for other thermotropics, and the possibility of a transition from a nematic to an isotropic phase is considered. The results obtained from dynamic viscoelasticity and DSC agree, and reveal the existence of a glass transition at 128°C (by DSC) and 137-147°C (by viscoelastic measurements, depending on frequency) as well as melting at 282°C. Annealing below 230°C produces two types of crystals, whereas annealing above this temperature gives rise to only one type of crystal, the melting temperature of which can be, depending on annealing time, as high as 340°C. The results are compiled in a phase diagram with six regions, four of them corresponding to the solid state, one to a liquid mesophase, and one to an isotropic phase.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090280909
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of different cross-linking systems on properties of highly saturated nitrile rubber compounds (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 1073-1078 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The peroxide curing of highly saturated nitrile rubber was analyzed. Reactions such as chain scission occurred that account for the drop in physical properties. The results are compared with an alternative cross-linking that is currently being assessed. With a new curing agent the chain-scission reaction was not present and the properties of the compounds were improved. Finally, an estimation of the free volume of the materials tested was attempted by using the WLF equation. © 1994 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070540809
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  • 8
    Electronic Resource
    Electronic Resource
    Sequential analysis by cooperative reactions on copolymers I. A theoretical treatment (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 14 (1976), S. 645-648 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.130141102
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  • 9
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur neuer AM2X2-Verbindungen in den Systemen Erdalkalimetall-Platinmetall-GermaniumProfessor Harald Schäfer zum 80. Geburtstage gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 13-16 
    Details
    ISSN: 0044-2313
    Keywords: Earthalkali metal rhodium/ruthenium germanide ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of New AM2X2 Compounds in the Systems Earthalkali Metal/Platinum Metal/Germanium.Four new ternary compounds in the systems earthalkali metal/platinum metal/germanium have been prepared and characterised by single crystal X-ray investigation. BaRu2Ge2 crystallizes orthorhombically, space group Fddd, a=634.4(1) pm, b=1 056.5(3) pm, c=1 273,1(3) pm. SrRu2Ge2 (a=430.6(1) pm, c=1 030.3(2) pm), BaRh2Ge2 (a=418.9(5) pm, c=1 175.7(10) pm) and SrRh2Ge2 (a=418.3(3) pm, c=1 071.8(6) pm) crystallize in the ThCr2Si2-type structure (tetragonal, space group I4/mmm).
    Notes: Vier neue ternäre Verbindungen im System Erdalkalimetall-Platinmetall-Germanium konnten dargestellt und röntgenographisch charakterisiert werden. BaRu2Ge2 kristallisiert orthorhombisch, Raumgruppe Fddd, a=634,4(1) pm, b=1 056,5(3) pm, c=1 273,1(3) pm. Im ThCr2Si2-Typ (tetragonal, Raumgruppe 14/mmm) kristalisieren SrRu2Ge2 (a=430,6(1) pm, c=1 030,3(2) pm), BaRh2Ge2 (a=418,9(5) pm, c=1 175,7(10) pm) und SrRh2Ge2 (a=418,3(3) pm, c=1 071,8(6) pm).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190105
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