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  • 1
    Electronic Resource
    Electronic Resource
    Carbon Steel Corrosion in Natural Waters and in the Corresponding Synthetic Waters Analysed by Impedance Spectroscopy (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 289-292 (Aug. 1998), p. 225-236 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.289-292.225.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Détermination du coefficient de diffusion des ions chlorures dans des bétons tunisiens (1991)
    Springer
    Materials and structures 24 (1991), S. 172-176 
    Details
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Summary Thus study deals with the penetration of chloride ions into various Tunisian cement concretes. The diffusion cell included a concrete plate, 2 cm thick, placed between two boxes containing, on one side, a chloride solution and on the other one, a saturated calcium hydroxide solution. The chloride content in the second solution was measured versus time by using a specific electrode. The ‘chloride content-time’ curves appeared to be of two parts. This result was interpreted by assuming that the diffusion process includes two stages. The apparent diffusivity of chloride in concrete was determined for these two stages. It is shown that the diffusivity decreases as a function of time, as if the chloride ions change the porosity of the hardened cement paste. The results obtained have made it possible to study the influence of cement type and concrete design on the diffusivity of chloride into the concretes under study.
    Notes: Résumé Cette étude présente un modèle de diffusion, basé sur la technique de cellule de diffusion, utilisé pour étudier la pénétration des ions chlorures dans le béton. La cellule de diffusion est constituée d'une plaque de béton, de 2 cm d'épaisseur, séparant deux compartiments parallélépipédiques, dont l'un contient une solution chlorurée et l'autre une solution saturée de chaux. La concentration des ions Cl− dans la seconde solution a été mesurée à laide d'une électrode spécifique. Il apparaît, en premier lieu, que les courbes de diffusion n'obéissent pas à la même loi et qu'elles comportent deux parties successives. En second lieu, la diffusivité des chlorures diminue au cours du temps. Les résultats ainsi obtenus nous ont permis d'étudier l'influence de la nature du ciment et de son dosage dans le béton sur la valeur de la constante de diffusion apparente.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02472982
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanisms of corrosion inhibition for an aluminium-silicon-magnesium alloy in 0.1 N NaOH solutions at 60 °C (1979)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 259-265 
    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: Mechanismus der Inhibierung der Korrosion einer Aluminium-Silicium-Magnesium-Legierung in 0,1 N NaOH bei 60 °CDer Mechanismus der Korrosionsinhibierung wurde mit einer Aluminium-Silicium-Magnesium-Legierung in 0,1 N NaOH bei 60 °C unter Verwendung billiger, nichttoxischer Stoffe als Inhibitoren untersucht. Die Wirkung von Kalzium- und Tartrat-Ionen wird voneinander getrennt betrachtet und gezeigt, daß ein unlösliches Kalzium-Aluminium-Tartrat vorliegt. Ebenso wird gezeigt, daß eine amorphe Aluminium-Silicat-Phase hoher Stabilität vorliegt; durch elektrochemische Messungen, gravimetrische Bestimmungen, Röntgen und IR-Spektroskopie wird gezeigt, daß Al3+ eine große Bedeutung besitzt.
    Notes: The mechanism of corrosion inhibition has been studied for an Al-Si-Mg alloy in a 0.1 N NaOH medium at 60 °C with cheap, non toxic substances. The effects of Ca2+ and tartrate ions are differentiated and the presence of an insoluble calcium alumino tartrate is evidenced. The greater stability of an amorphous alumino silicate phase is also emphasized, and with electrochemical measurements, weighing tests, X-ray diagrams and IR spectroscopy, the importance of AlIII is revealed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19790300407
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    Paper (German National Licenses)
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