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Deterioration of copper and bronze caused by acidifying air pollutants (1995)

Reisener, A. ; Stöckle, B. ; Snethlage, R.

Springer

Water, air & soil pollution 85 (1995), S. 2701-2706

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ISSN: 1573-2932

Keywords: copper ; bronze ; field exposure ; material degradation. 3d roughness measurements ; dose-response-functions ; ozone ; sulfur dioxide

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract The ‘ICP on effects on materials’ was launched in 1985, within the framework of the Convention on Long-range Transboundary Air Pollution with the aim to find an approach for clearing the main gaps in the knowledge about material degradation caused by environmental impacts. The project was organized as a staggered8 year's material exposure programme accompanied by an extensive measuring programme for environmental parameters. During the evaluation of the 4 years data set it took shape that the most efficient parameters for quantifying the material degradation are the mass loss and especially for copper the corrosion volumes. Bronze already reacts extremely sensitive on low SO2 concentrations. The starting corrosion rate for copper is suprisingly high. A strong impact of chloride on the formation of pin holes for sheltered copper could be detected without showing high mass loss. At simultanous presence of ozone the corrosive action is catalysed by it's oxidation power and leads to severe mass loss. Based upon the 4 years data set for most of the materials preliminary dose-response-functions have been prepared. For the first time a synergetic effect of SO2 and ozone has been demonstrated in a field exposure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01186242

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Atmosphärische Korrosion unter kontrollierten Bedingungen: Konzeption und Aufbau einer Schadgasbewitterungsanlage zur Korrosionsuntersuchung an Bronze und Kupfer (1997)

Reisener, A. ; Still, M. ; Venzke, H.

Weinheim : Wiley-Blackwell

Materialwissenschaft und Werkstofftechnik 28 (1997), S. 131-141

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ISSN: 0933-5137

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: Atmospheric Corrosion under Controlled Conditions: Concept and Installation of an Apparatus for Monitoring Pollution Gas Induced Corrosion of Copper and Bronze SamplesThis paper describes an apparatus for the investigation of corrosion of copper and bronze samples on a laboratory scale at the Bayerisches Landesamt für Denkmalpflege, Munich. The chamber allows the influence of SO2 and NO2 contaminated test gas on the samples to be studied in combination with dew formation on the sample surface. By means of cooling and heating of the samples and the use of a gas mixing unit, a defined amount of dew and contamination can be reproducibly applied to the samples. The design and realization of the apparatus, including the component selection and details of construction to satisfy experimental demands, are discussed. Results of commissioning tests are shown, quantifying the homogenity of the chamber climate and the temperature distribution across the samples.

Notes: Es wird eine Schadgasbewitterungskammer vorgestellt, die für Korrosionsuntersuchungen an Bronze- und Kupferproben im Labormaßstab am Bayerischen Landesamt für Denkmalpflege installiert wurde. In dieser Kammer wird der Einfluß eines SO2/NO2 Schadgasgemisches bei Betauung der Proben untersucht. Dazu wird innerhalb der Kammer mit Hilfe eines reproduzierbar einstellbaren Wechselklimas eine künstliche Bewitterung des Probenmaterials erzeugt. Die Einstellung des Schadgasgehaltes sowie der Luftfeuchtigkeit im zugeführten Testgas erfolgt über eine Gasmischapparatur. Die periodischen Bewitterungs- und Trockenzyklen werden über Abkühlung bzw. Aufheizung der Proben gesteuert. In der vorliegenden Arbeit wird die Konzeption und die Verwirklichung der Anlage beschrieben. Dabei wird auf die Auswahl und Konstruktion der Einzelkomponeten sowie auf die eigentliche Klimagenerierung eingegangen. Untersuchungen zur Homogenität des Kammerklimas sowie zur Temperaturverteilung über die einzelnen Proben schließen die Inbetriebnahme der Bewitterungskammer ab.

Additional Material: 14 Ill.