Academic thesis
| Nicolas Hannay: | Experiments on removing oxide layers on brass using plasma-activated water | Back |
| Language: | Original - Translation | |
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| Abstract: | The removal of oxide layers from metals in restoration often presents both technical and ethical di- lemmas. Therefore, this master´s thesis investigated the potential of plasma-activated water (PAW) for removing oxide layers from brass surfaces. The aim was to evaluate the cleaning effect on artifi- cially aged samples and historical objects. Furthermore, comprehensive investigations of PAW´s pH value were carried out, and possibilities for producing plasma-activated hydrogels (PAH) were explored to enable more targeted application. PAW treatments resulted in a high gloss and brightening of the surfaces, which was interpreted as the removal of dull, overlying oxide layers. However, the original tone of the brass could not be achieved in any case. The surfaces remained redder and changed significantly after treatment. pH analyses confirmed PAW´s stability in closed, dark containers, while storage exposed to air or at elevated temperatures caused a decrease in pH. The increased pH values on the metal surface after treatment might indicate the formation of new corrosion products. The production of PAH was successful with the thickening agents Carbopol®, Xanthan, and Klucel® M. Attempts to remove oxide layers using the prepared gels yielded similar results to liquid PAW. Due to the strong color differences after treatment, the ongoing changes to the surface, and the risk of acidic residues, PAW cannot currently be recommended for removing oxide layers in restora- tion. However, its corrosion-removing properties open up potential applications in the (pre-)treat- ment of metals. |
| Keywords: | Plasma-activated water (PAW), Plasma-activated hydrogel (PAH), Brass, Oxide layer, Corrosion |
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| Contact: |
Nicolas Hannay nichannay@[Diesen Teil loeschen]googlemail.com |
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full-text thesis 
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This work is licensed under a Creative Commons BY-NC-ND 3.0 Germany License.
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| DOI (Digital Object Identifier) | 10.5165/hawk/552 |
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