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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 235-238 (Oct. 1996), p. 911-916 
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Electrochimica Acta 39 (1994), S. 1781-1786 
    ISSN: 0013-4686
    Keywords: amorphous alloys ; electrocatalysis ; hydrogen evolution ; metallic glasses
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The knowledge of the relationship among chemical composition, microstructure, productive processes, functional properties, quality and price of the final product is an ever greater requirement for the firms producing dental alloys as well as for the dental laboratories making prosthesis. The present study deals with the evaluation of the corrosion resistance of high-Pd and Pd-Ag alloys by quantification of released ions following the recent European regulations suggested. Moreover the reliability of the alloys as far as concern their corrosion resistance was also investigated in relation to the different steps of alloy industrial production and restoration forming processes as well as after homogenization treatments followed by different cooling rate. The very complex microstructure of both alloys was greatly affected by the different casting conditions, deformation rate and thermal treatments used in alloy industrial production and prosthesis manufacturing. However the corrosion resistance of both alloys remained very good in all metallurgical states. The potentiodynamic tests allowed to distinguish among the structural conditions: the homogenization treatments, eliminating segregation inside the different phases, improved further the corrosion resistance of both alloys.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 98-106 
    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: Korrosionsverhalten von metallischen Gläsern des Typs Fe80-xCoxB10Si10 in sulfat und chloridhaltigen MedienDas Korrosionsverhalten einer Reihe von Glaslegierungen des Typs Fe80-xCoxB10Si10 mit x = 0, 15, 30, 55, 70 und 80, die für ihre magnetischen Eigenschaften bekannt sind, wurde in sulfat- und chloridhaltigen Lösungen unterschiedlicher pH-Werte gravimetrisch untersucht. Um eventuell bevorzugte Auflösungsreaktionen von Legierungselementen solcher Legierungen nachweisen zu können, wurde nach den Korrosionsversuchen die Zusammensetzung der Lösungen mittels Plasmamassenspektrometrie und optischer Emissionsspektroskopie untersucht.Dabei wurde beobachtet, daß die sulfathaltigen Lösungen aggressiver sind und daß die amorphen Legierungen mit zunehmendem Kobaltgehalt korrosionsbeständiger werden. Steigert man den pH des angreifenden Mittels von 1,5 auf 5,6, so nimmt die Korrosionsgeschwindigkeit um zwei Größenordnungen ab.Die Korrosionsprodukte wurden mittels Röntgenbeugung und Rasterelektronenmikroskopie untersucht; dabei zeigte sich, daß Fe2O3 · H2O der Hauptbestandteil des auf eisenreichen amorphen Legierungen in sulfathaltigen Medien entstehenden Überzugs ist.
    Notes: The corrosion behaviour of a series of glassy alloys, Fe80-xCoxB10Si10 (x = 0, 15, 30, 55, 70, 80), well known for their magnetic properties, has been investigated in sulphate- and chloride-containing solutions of different pH, employing weight loss measurements. In order to point out preferential dissolution reactions of metallic glasses constituent elements, analyses of the solutions were performed after corrosion tests by means of plasma source mass spectrometry and optical emission spectroscopy.A higher aggressivity of the sulphate containing solutions has been observed. The amorphous alloys exhibit an increased corrosion resistance with the increase of cobalt content. Increasing the pH of the aggressive media from 1.5 to 5.6 a decrease of two orders of magnitude in the corrosion rates has been observed.The corrosion products have been investigated by means of X-ray diffraction and scanning electron microscopy. Hydrated iron oxide Fe2O3 · H2O was the major constituent of the film formed on iron-rich amorphous alloys immersed in sulphate-containing media.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 45 (1994), S. 392-401 
    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: Austenitischer nichtrostender Sinterstahl: Korrosionsverhalten in sulfat- und chloridhaltigen MedienElektrochemische Untersuchungen (Polarisationskurven, Messungen des Polarisationswiderstandes) zusammen mit Massenverlustmessungen und quantitativen chemischen Analysen der Lösungen nach dem Tauchversuch wurden durchgeführt, um das Korrosionsverhalten gesinterter, austenitischer nichtrostender Stähle des Typs 304L und 316L in sulfat- und chloridhaltigen Lösungen zu beurteilen.Die Proben wurden in Stickstoffatmosphäre bei 1120 und 1190°C sowie im Vakuum bei 1200°C gesintert. Vor und nach den Korrosionsversuchen erfolgten Untersuchungen mit Röntgenbeugungsanalyse sowie rasterelektronenmikroskopische Aufnahmen in Verbindung mit EDS-Mikroanalyse.Es wurde versucht, eine Korrelation zwischen dem Korrosionsverhalten und den mechanischen Eigenschaften der Proben, wie Rockwellhärte, Schwindung, Schlagfestigkeit und Zugfestigkeit, festzustellen.
    Notes: Electrochemical investigations (polarization curves, polarization resistance measurements), together with weight loss measurements and quantitative chemical analysis of the solutions after immersion of samples were used to evaluate the corrosion behaviour of type 304L and 316L sintered austenitic stainless steels in sulphate and chloride containing solutions.The samples were sintered in nitrogen based atmosphere, at 1120 and 1190°C, and in vacuum at 1200°C and submitted to X-ray diffraction analysis and SEM observation together with EDS microanalysis before and after the corrosion tests.A correlation is tempted between the corrosion behaviour and the mechanical properties of samples as Rockwell hardness, shrinkage, unnotched impact strength, ultimate tensile strength.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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