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  • 1
    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.
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  • 2
    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.
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 73-80 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The passivating surface oxide on titanium is one of the elements considered in the explanation of the favorable biolgic response of this metal in implant applications. In the present study, transmission electron microscopy was used to identify the crystal structure and morphology of the oxide film on commercially pure titanium specimens befor and after immersion in simulated physiologic fluids. The results show that the oxide layer is composed mainly of anatase and rutile, both of which are tetragonal in structure. Although the simulated physiologic fluids did not induce an observable change in the crystal structure for the immersion times investigated, the results indicate an immersion-induced change in microstructure from a finegrained to a coarser-grained structure. The grain growth observed could be attributed to the growth of the native oxide crystals; however, it most likely results from the formation of a new oxide layer. The results also support oxide thickening as one of the processes associated with passive dissolution of titanium. © 1995 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 31 (1996), S. 227-234 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Titanium and its alloys, like the majority of metallic implant materials, release passive metal dissolution products. This raises the issues of amount and fate, i.e. transport, storage, and/or excretion of these metal dissolution products. In this paper we document titanium levels in tissues local to a commercially pure titanium implant in the absence of wear; compare these values to control tissues; and determine the relative contribution of the local accumulation to total release. Titanium fiber felts were implanted into the tibia of rabbits for periods up to 1 year. Bone and muscle tissue samples near the implant were collected. Using electrothermal atomic absorption spectrophotometry the samples were analyzed for titanium content.Compared to controls, titanium levels in the bone near the implant were elevated at 1-, 4-, and 12-month postoperative time points. The 12-month time point had higher periprosthetic bone titanium levels than both the 1- and the 4-month implant groups. Titanium levels in muscle tissue near the felt also indicated release was occurring. The data support the hypothesis that metal species released from titanium implants in the absence of wear have a limited solubility. As a result, they tend to remain in an area local to the implant. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
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