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  • Polymer and Materials Science  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 343-347 
    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: Schutzwirkung von zwei Dampfphaseninhibitoren bei der Korrosion von StahlUntersucht wurde die Wirkung von zwei Dampfphaseninhibito-ren (Dicyclohexylammoniumnitrit (DICHAN) und Dicyclohexyl-amin (DICHAMIN)) bei der Korrosion von Stahl an der Atmosphäre (100% RF) unter isothermen Bedingungen (25 °C). Um an dünnen adsorbierten Feuchtigkeitsschichten elektrochemische Daten zu erhalten, wurde ein Dampfphaseninhibitor-Monitor entwickelt. Die Meßdaten wurden mit Hilfe von drei elektrochemischen Methoden und mittels Bildanalyse überprüft. Die Versuchsergebnisse zeigen, daß die Korrosion von Stahl durch die beiden Verbindungen gehemmt wird. Der verwendete Monitor in Verbindung mit den elektrochemischen Techniken ermöglicht die Deutung des Inhibierungsmechanismus.
    Notes: The action of two vapour phase inhibitors (VPI), dicyclohexyl-ammonium nitrite (DICHAN) and dicyclohexylamine (DICHAMIN), on the atmospheric corrosion of mild steel at a relative humidity of 100% and under isothermal conditions (25 °C) has been studied. In order to obtain electrochemical data with thin adsorbed moisture layers a vapour phase inhibitor monitor (VPIM) was developed. A check of the data was done by three electrochemical techniques and by the image analysis technique. The tests carried out have revealed that the corrosion rate of mild steel decreases in the presence of DICHAN and DICHAMIN. With the VPIM and the electrochemical techniques used it is possible to understand the inhibition mechanism of these two vapour inhibitors on the atmospheric corrosion of steel.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 46 (1995), S. 515-519 
    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: Korrosion von Bronze durch Essig- und Ameisensäuredämpfe, Schwefeldioxyd und NatriumchloridpartikelVorliegende Arbeit behandelt die Korrosion von Bronze mit und ohne künstlicher Patina durch Essig- und Ameisensäuredämpfe, Schwefeldioxyd und Natriumchlorid bei relativer Luftfeuchtigkeit von 100%. Die eingesetzten Verfahren waren Gravimetrie, Röntgenstrahlenbeugungsanalyse, Infrarotanalyse und Rasterelektronenmikroskopie. Wie Schwefeldioxyd und Natriumchlorid erzeugen auch Essig- und Ameisensäuredämpfe auf Bronze eine starke Korrosion. Die wichtigsten identifizierten Bestandteile sind Cuprit, Kupferschwefel, hydratisiertes Kupfersulfat, Kupferazetat und Kupferformiat.
    Notes: This paper studies the corrosion of patinated and unpatinated bronze by acetic and formic acid vapours, sulphur dioxide and sodium chloride salt particles, at 100% relative humidity. Weight loss, X-ray diffraction, infrared and scanning electron microscopy were the techniques used. Acetic and formic acid vapours, sulphur dioxide and sodium chloride produce a high corrosion rate on bronze. In general, no protective effect was found by the patina on bronze. The principal compounds identified were Cu2O, Cu2S, Cu5(SO4)2(OH)6 · 5H2O, Cu(CH3CO2)2 · XH2O and Cu(HCO2)2.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 26 (1992), S. 1039-1051 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Because periprosthetic infection remains a vexing problem for patients receiving implanted devices, we evaluated the effect of several materials on neutrophil free radical production. Human peripheral blood neutrophils were incubated with several sterile, lipopolysaccharide (LPS)- free biomaterials used in surgically implantable prosthetic devices: polyurethane, woven dacron, and Velcro. Free radical formation as the superoxide (O2-) anion was evaluated by cytochrome c reduction in neutrophils that were exposed to the materials and then removed and in neutrophils allowed to remain in association with the materials. Neutrophils exposed to polyurethane or woven dacron for 30 or 60 min and then removed consistently exhibited an enhanced release of O2- after simulation via receptor engagement with formyl methionyl-leucyl- phenylalanine. Enhanced reactivity to stimulation via protein kinase C with phorbol myristate acetate, however, was not consistently observed. The cells evalu- ated for O2- release during continuous association with the biomaterials showed enhanced metabolic activity during short periods of association (especially with polyurethane and woven dacron). Although O2- release by neutrophils in association with these materials decreased with longer periods of incubation, it was not obliterated. These studies, therefore, show that several commonly used biomaterials activate neutrophils soon after exposure and that this activated state diminishes with prolonged exposure but nevertheless remains measurable. The diminishing level of activity with prolonged exposure, however, suggests that ultimately a depletion of reactivity may occur and may result in increased susceptibility to periprosthetic infection.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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