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  • 1
    Electronic Resource
    Electronic Resource
    Surface modification of the IN-657 superalloy after exposure to a molten mixture: 82%K"2S"2O"7-18%V"2O"5 at high temperature
    Amsterdam : Elsevier
    Surface & Coatings Technology 68-69 (1994), S. 58-63 
    Details
    ISSN: 0257-8972
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0257-8972(94)90138-4
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  • 2
    Electronic Resource
    Electronic Resource
    MONITORING SUSPENDED PARTICULATE MATTER IN PUERTO RICO: FIELD MEASUREMENTS AND REMOTE SENSING (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 30 (1994), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The spatial distribution of suspended particulatematter (SPM) was estimated in Mayagüez Bay on the west coast of Puerto Rico by using traditional ship board measurements and remotely sensed data acquired over four days during January 1990. This effort was part of a joint project between NASA and the University of Puerto Rico to develop techniques to monitor the water quality of a Caribbean coastal zone. This paper presents the methods and algorithms developed to map and analyze short term changes in the source and spatial distribution of SPM in Mayagüez Bay by using remotely sensed data acquired by the Calibrated Airborne Multispectral Scanner (CAMS). A PC-based data acquisition system was developed to record continuous ship measurements of select in- water variables. Spectral reflectances derived from CAMS red and near-IR data were corrected for atmospheric effects and then used to generate maps of SPM. These maps displayed SPM plumes associated with the mouths of the bay's three river systems. Significant day-to-day differences in the spatial characteristics were observed, suggesting that changes in river discharge occurred. However, an analysis of estimated river discharge, sediment yield, local wind field, and thermal river plume indicates that observed sediment plumes result primarily from wind-driven resuspension events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1994.tb03290.x
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  • 3
    Electronic Resource
    Electronic Resource
    A Comparison of the High-Temperature Oxidation of 17Cr-2Ni and 18Cr-8Ni Austenitic Stainless Steels at 973 K (1998)
    Springer
    Oxidation of metals 49 (1998), S. 297-324 
    Details
    ISSN: 1573-4889
    Keywords: AISI 304 ; LOW-NICKEL AUSTENITIC STAINLESS STEEL ; HIGH TEMPERATURE ; HIGH MANGANESE ; ISOTHERMAL AIR OXIDATION
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior in air at 973 K of theaustenitic stainless steels 18Cr8Ni and17Cr-2.5Ni-10.5Mn-2Cu-0.17N (low-nickel content), wasstudied in a thermobalance. The steels were heated fromroom temperature up to 973K at 10 K min-1, oxidizedfor 80 hr and then cooled to room temperature at 80 Kmin-1. The two steels had the same weightgains, 0.18 mg cm-2, which is equivalent tooxidation layers about 1.15 μm theoretical thickness. In both cases, thegeneral shapes of the ΔWS-1 (mgcm-2) curves vs. t (hours) were parabolic,but X-ray diffraction of the oxidized surfaces, surfaceand crosssection optical microscopy and SEM observations and EDSmicroanalysis show important differences betweenthem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018830424480
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  • 4
    Electronic Resource
    Electronic Resource
    Corrosion Behavior of 12CrMoV Steel in Waste Incineration Environments: Hot Corrosion by Molten Chlorides (1998)
    Springer
    Oxidation of metals 49 (1998), S. 467-484 
    Details
    ISSN: 1573-4889
    Keywords: MOLTEN CHLORIDES ; WASTE INCINERATION ; 12CrMoV STEEL ; CORROSION RESISTANCE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The corrosion resistance of a 12CrMoV alloy incontact with a molten mixture of (52-48)mol.%PbCl2-KCl, similar to that found inwaste incineration plants, has been studied. Thecorrosion kinetics have been analyzed using continuous-currentelectrochemical techniques and electrochemical impedancespectroscopy (EIS). Studies were performed to determinethe influence that temperature and the presence of carbon in the salt have on the corrosion rate.Scanning electron microscopy (SEM) and electron-probemicroanalysis (EPMA) were used as additional analyticaltechniques to analyze the corrosion products in order to elucidate the corrosionmechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018851029023
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  • 5
    Electronic Resource
    Electronic Resource
    Corrosion Behavior of IN-800 Superalloy in Waste-Incineration Environments: Hot Corrosion by Molten Chlorides (1999)
    Springer
    Oxidation of metals 51 (1999), S. 507-525 
    Details
    ISSN: 1573-4889
    Keywords: MOLTEN CHLORIDES ; WASTE INCINERATION ; IN-800 SUPERALLOY ; CORROSION RESISTANCE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The corrosion resistance of the IN-800superalloy in contact with a molten mixture of (52-48)mol.% PbCl2-KCl, similar to that found inwaste-incineration plants, has been studied. Thecorrosion kinetics have been analyzed using continuous-currentelectrochemical techniques and electrochemical-impedancespectroscopy (EIS). Studies were performed to determinethe influence of temperature and of the presence of carbon in the salt on the corrosion rate.Scanning electron microscopy (SEM) and electron probemicroanalysis (EPMA) were used as additional techniquesto analyze the corrosion products in order to elucidate the corrosion mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018895312069
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  • 6
    Electronic Resource
    Electronic Resource
    Changes in cold sealed aluminium oxide films during ageing (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 843-852 
    Details
    ISSN: 1572-8838
    Keywords: ageing ; aluminium ; anodizing ; cold sealing ; highly dry atmosphere ; sealing quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract EIS in the 100 kHz–1 mHz frequency range was applied to the study of changes in cold sealed aluminium oxide films exposed to highly wet and extremely dry atmospheres. Information about these changes was obtained from evolution of the impedance diagrams and, in particular, from film resistance and capacitance values determined from them. Results show that sealing quality, assessed from EIS, increases over months and years as ageing proceeds in a natural atmosphere. The analysis was completed with the aid of XPS and EDX techniques and standard quality control tests. Measurements show that specimens aged very rapidly in wet atmospheres, so that they passed all sealing quality tests within 72h. The sealing quality improves with ageing even in highly dry atmospheres despite the fact that pores lose part of their initial filling water. XPS analysis revealed that fluorine and nickel concentrate in the outer layers of cold sealed anodic films; on the other hand, films obtained by the traditional HTS procedure exhibit a uniform composition throughout their thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003569330080
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of porous aluminium oxide films from a.c. impedance measurements (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 229-238 
    Details
    ISSN: 1572-8838
    Keywords: ageing ; aluminium ; anodizing ; sealed specimens ; unsealed specimens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract An equivalent circuit (EC) that reproduces the a.c. impedance of porous aluminium oxide films in a highly approximate manner is proposed. The results reveal that electrochemical impedance spectroscopy (EIS) is a powerful tool for obtaining detailed information on the electrochemical properties of both the porous and barrier layer on which the corrosion resistance of aluminium depends. The impedance at a given frequency can be used for accurate calculation of the electrochemical parameter for the oxide film represented by each element of the EC. In this way, the effects of any factor on sealing and ageing of anodized aluminium oxide films can be precisely analysed. The EIS technique provides an effective, advantageous alternative to existing seal quality control tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003481418291
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  • 8
    Electronic Resource
    Electronic Resource
    Nachweis und Bestimmung der Halogene (1933)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 94 (1933), S. 52-54 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332319
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  • 9
    Electronic Resource
    Electronic Resource
    Wolfram und Molybdän (1937)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 111 (1937), S. 416-424 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01365599
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  • 10
    Electronic Resource
    Electronic Resource
    Corrosion behaviour of highly alloyed stainless steels in mixed chloride and fluoride aqueous solutions (1997)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 216-220 
    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: Korrosionsverhalten hochlegierter nichtrostender Stähle in chlorid- und fluoridhaltigen wäßrigen LösungenAn zwei Typen von nichtrostenden Stählen -einem Duplex Stahl (ferritisch-austenisch) und zwei austenischen Stahlsorten -- wurde das Korrosionsverhalten unter Anwendung von gravimetrischen und elektrochemischen Verfahrensweisen untersucht. Die verwendeten Elektrolyten waren eine Mischung aus Chloridionen (3000, 9000 und 15000 ppm) und Fluoridionen (4800 und 15000 ppm) mit einem pH-Wert von 3. Die Arbeitstemperatur betrug 60 und 70°C. Die elektrochemischen Ergebnisse zeigen, daß der Duplex-Stahl eine höhere Korrosionsbeständigkeit aufweist. In manchen Fällen zeigte dieser Werkstoff nach 60 Tagen Lochfraß. Die gravimetrischen Ergebnisse zeigen niedrige Korrosionsgeschwindigkeiten bei allen drei untersuchten Materialien.
    Notes: Laboratory weight loss and cyclic potentiodynamic polarization corrosion tests were performed on two types of corrosion resistant alloys, a duplex alloy (ferritic-austenitic stainless steel) and two austenitic stainless steels, in mixtures of chloride (3000, 9000 and 15000 ppm) and fluoride (4800 and 15000 ppm) ions at pH 3. Two temperatures were tested, 60 and 70°C. The electrochemical results indicate that the duplex stainless steel presents high corrosion resistance. Weight loss results show low corrosion rates of the two types of stainless steels after 60 days exposure. Sonic pits-crevices were found under the corrosion crust deposits on the duplex stainless steel.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19970480403
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