Publication detail

Plasmachemical Removal of Corrosion Layers from Iron in Pulsed RF Discharge

SÁZAVSKÁ, V. KRČMA, F. ŠIMŠOVÁ, T. ZEMÁNEK, N.

Original Title

Plasmachemical Removal of Corrosion Layers from Iron in Pulsed RF Discharge

English Title

Plasmachemical Removal of Corrosion Layers from Iron in Pulsed RF Discharge

Type

abstract

Language

en

Original Abstract

Plasmachemical treatment of archaeological artefacts by RF hydrogen low pressure plasma is a relatively new technique developed during the 1980s. The corrosion removal process is very complex and its mechanism is not fully understood up to now and also optimal conditions are not known well. To study the process condition influence, the model corroded samples were prepared on iron with defined roughness using HCl, HNO_3 and H_2SO_4 corrosion agents. The corrosion layers before and after plasma treatment were analyzed by electron microscopy including the study of corrosion layer profile. The experiment was done in Quartz reactor with outer electrodes creating capacitive coupled RF discharge in pure hydrogen at pressure of 170 Pa. The duty cycle was varied from continuous regime up to 1:25. The plasma treatment duration was 40-120 minutes depending on the duty cycle. The results showed that the application of pulsed discharge regime could maintain the corrosion removal process at lower mean power as well and thus the treated samples were affected by lower heating stress. On the other hand, the process was significantly longer.

English abstract

Plasmachemical treatment of archaeological artefacts by RF hydrogen low pressure plasma is a relatively new technique developed during the 1980s. The corrosion removal process is very complex and its mechanism is not fully understood up to now and also optimal conditions are not known well. To study the process condition influence, the model corroded samples were prepared on iron with defined roughness using HCl, HNO_3 and H_2SO_4 corrosion agents. The corrosion layers before and after plasma treatment were analyzed by electron microscopy including the study of corrosion layer profile. The experiment was done in Quartz reactor with outer electrodes creating capacitive coupled RF discharge in pure hydrogen at pressure of 170 Pa. The duty cycle was varied from continuous regime up to 1:25. The plasma treatment duration was 40-120 minutes depending on the duty cycle. The results showed that the application of pulsed discharge regime could maintain the corrosion removal process at lower mean power as well and thus the treated samples were affected by lower heating stress. On the other hand, the process was significantly longer.

Keywords

RF discharge in hydrogen, removal of corrosion layers on iron, optical emission spectroscopy

RIV year

2008

Released

30.06.2008

Publisher

Sofia University

Location

Sofia

Pages from

42

Pages to

42

Pages count

1

BibTex


@misc{BUT31664,
  author="Věra {Sázavská} and František {Krčma} and Tereza {Šimšová} and Nikola {Zemánek}",
  title="Plasmachemical Removal of Corrosion Layers from Iron in Pulsed RF Discharge",
  annote="Plasmachemical treatment of archaeological artefacts by RF hydrogen low pressure plasma is a relatively new technique developed during the 1980s. The corrosion removal process is very complex and its mechanism is not fully understood up to now and also optimal conditions are not known well. To study the process condition influence, the model corroded samples were prepared on iron with defined roughness using HCl, HNO_3 and H_2SO_4 corrosion agents. The corrosion layers before and after plasma treatment were analyzed by electron microscopy including the study of corrosion layer profile. The experiment was done in Quartz reactor with outer electrodes creating capacitive coupled RF discharge in pure hydrogen at pressure of 170 Pa. The duty cycle was varied from continuous regime up to 1:25. The plasma treatment duration was 40-120 minutes depending on the duty cycle. The results showed that the application of pulsed discharge regime could maintain the corrosion removal process at lower mean power as well and thus the treated samples were affected by lower heating stress. On the other hand,  the process was significantly longer.",
  address="Sofia University",
  booktitle="Proceedings of 3rd International Workshop and Summer School on Plasma Physics",
  chapter="31664",
  howpublished="print",
  institution="Sofia University",
  year="2008",
  month="june",
  pages="42--42",
  publisher="Sofia University",
  type="abstract"
}