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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Application of the Polarization Resistance Method to the Study of Lead Corrosion in Sulphuric Acid (1975)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 26 (1975), S. 758-764 
    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: Anwendung der Polarisationswiderstands-methode zur Untersuchung der Korrosion von Blei in SchwefelsäureDie Geschwindigkeit der Korrosion und ihre zeitliche Entwicklung wurden an Bleilegierungen in konzentrierter heißer Schwefelsäure mittels Polarisationswiderstandsmessungen untersucht. Bei den Legierungen mit Fähigkeit zu Selbstpassivierung und Aufrechterhaltung des passiven Zustandes unter den Versuchsbedingungen ist es möglich. aufgrund der elektrochemischen Meßwerte genaue Angaben über die zu erwartende Korrosion zu machen. Andererseits gibt es spezifische Probleme bei den Bleilegierungen, deren Korrosionspotential alterierend zwischen Aktiv- und Passivzustand wechselt. Trotzdem ist es bei gewissen Modifizierungen der Methode moglich, die Polarisations-widerstandsmessung auch unter diesen Bedingungen einzusetzen, wobei natürlich die Genauigkeit geringer ist als im Falle der Legierungen mit stabiler Passivität. Aufgrund der Versuchsergebnisse definieren die Autoren verschiedene Mechanismen für die Korrosion der Bleilegierungen in Schwefelsäure.
    Notes: The corrosion rates and their evolution with time of lead alloys in hot-concentrated sulphuric acid have been evaluated through polarization resistance measurements. For the case of alloys capable of being self-passivated and of retaining the passive state under the exposure conditions, accurate corrosion rates can be predicted from the electrochemical data. On the other hand, some special problems are associated with the application of the polarization method to lead alloys with exhibit alternating changes of corrosion potential between an active and a passive state. Nevertheless, the method, with some slight modifications, continues to be effective for determining corrosion rates although to a lesser degree of accuracy than with stable alloys. On the basis of the results obtained, the different mechanisms of lead alloy corrosion in sulphuric acid are outlined.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19750261003
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidation der Pb-Ca-Legierungen in flüssigem Zustand (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 815-820 
    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: Oxidation of PbCa alloys in the liquid stateThe effect of various temperatures, the composition of the alloy and the corroding atmosphere is studied with a thermobalance during the oxidation of molten PbCa alloys. The rate controlling step of the oxidation depends on the test conditions. The results obtained at 700°C are in agreement with data found in literature and according to which the oxidation increases with the Ca content; in this range calcium is subject to preferential oxidation. At 600°C and temperatures below that the addition of calcium does not only not increase oxidation but may give rise to a decrease.
    Notes: Mit einer Thermowaage wird die Wirkung verschiedener Temperaturen, der Zusammensetzung der Legierung und der Zusammensetzung der angreifenden Atmosphäre bei der Oxidation geschmolzener Pb-Ca-Legierungen untersucht. Der geschwindigkeitsbestimmende Schritt der Oxidation hängt von den Versuchsbedingungen ab. Bei 700°C bestätigen die bei der vorliegenden Untersuchung erhaltenen Ergebnisse die Literaturangaben, wonach die Oxidation bei zunehmendem Ca-Gehalt ansteigt; dabei wird das Calcium vorzugsweise oxidiert. Dagegen wird bei 600°C und darunter die Oxidation durch Zusatz von Calcium nicht nur nicht verstärkt, sondern sogar verringert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780291206
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  • 4
    Electronic Resource
    Electronic Resource
    The protective action of two vapour phase inhibitors on the corrosion of mild steel (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 343-347 
    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: 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
    URL: http://dx.doi.org/10.1002/maco.19900410605
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of grid cast structure on the anodic corrosion of lead (1972)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 554-561 
    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: Einfluß der Gußstruktur der Gitter auf die anodische Korrosion des BleisDer Einfluß der Gußstruktur auf das Ausmaß des anodischen Angriffs ist an sechs Legierungen auf Bleibasis untersucht worden. Ein Vergleich der Gewichtsverluste einer Reihe von Platten, die jeweils in zwei deutlich unterschiedenen Gußgefügen untersucht wurden (fein- und grobkörnig) zeigt, daß die Struktur die Korrosion häufig sehr stark beeinflußt. Die Richtung dieses Einflusses ist abhängig von der Art der jeweiligen Legierung. In manchen Fällen ist der Angriff bei grobkörniger Metallstruktur stärker, während in anderen Fällen der gegenteilige Effekt beobachtet wird. Abschließend wird eine theoretische Deutung der wichtigsten beobachteten Tatsachen gegeben. Diese Deutung beruht auf einer Analyse der Möglichkeiten eines selektiven Angriffs des Metalls und der Zerstörung von Gefügeeinheiten.
    Notes: The influence of cast structure on the magnitude of the anodic attack has been studied for six lead base materials.A comparison of the losses of weight of series of grid samples corresponding to the testing of two well differentiated cast structures for each material (a “coarse” structure and a “fine” one) shows that there is often a significant influence of the structure on the corrosion. The direction of the effect depends on the type of alloy tested. In some cases the “coarse” structure motivates a higher attack than the “fine” structure; in other cases, the opposite effect is encountered.Finally, a theoretical justification is given of the principal facts observed. This is chiefly based on an analysis of the possibilities of selective attack of the material and disintegration of structural units.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19720230705
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the interfacial chemistry of chlorinated rubber paint on different substrates after the curing process (1998)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 26 (1998), S. 433-443 
    Details
    ISSN: 0142-2421
    Keywords: chlorinated rubber ; metallic substrates ; polymeric sheet substrate ; interfacial degradation ; curing process ; adhesion ; XPS ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The interfacial chemistry of a highly pigmented chlorinated rubber paint applied over aluminium, cold-rolled and stainless steel, copper and zinc metallic substrates and poly(vinyl chloride) (PVC) polymer sheet have been studied using x-ray photoelectron spectroscopy (XPS). The results obtained by XPS were compared with those of bond strength measurements. The XPS analyses reveal significant differences in the failure mode. The chlorinated rubber paint on the PVC polymer sheet displays the highest bond strength value and on the zinc the lowest. Chemical changes, suggesting dehydrochlorination of chlorinated rubber paint in the paint/metal interfacial region, were only observed on the metallic substrates. With the aluminium, stainless steel, copper and zinc substrates, the curing of the chlorinated rubber paint causes the formation of a highly hydrocarbon-enriched interfacial paint surface. In contrast, the chlorinated rubber paint/PVC polymer sheet system shows no change in the interfacial surface composition. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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