Publication detail

Reduction of Corrosion Layers in Low Temperature Plasma

KRČMA, F. SÁZAVSKÁ, V. ZEMÁNEK, N. ŘÁDKOVÁ, L. FOJTÍKOVÁ, P. PŘIKRYL, R. KOZÁK, O. JANOVÁ, D. SLÁMOVÁ, J.

Original Title

Reduction of Corrosion Layers in Low Temperature Plasma

English Title

Reduction of Corrosion Layers in Low Temperature Plasma

Type

conference paper

Language

en

Original Abstract

Plasma chemical treatment of archaeological artifacts by RF hydrogen low pressure plasma is a relatively new technique developed during the 1980s. The corrosions as well as their removal are a very complex problem. The mechanism of corrosion removal is not fully understood up to now and thus optimal conditions are not known well. Because each archaeological object is original it is necessary to study the influence of processes and discharge conditions using the model corroded samples. The sample heating due to the interaction with RF field created by plasma as well as heating directly by contact with plasma must be decreased as much as possible to protect the material structure changes. On the other hand, particular power is necessary for the creation of plasma with sufficiently high concentration of reactive particles, mainly of atomic hydrogen. Thus the pulsed discharge should be a best way how to solve these antagonistic tasks. Our study was done using model corrosion samples of iron, copper, bronze and brass prepared by the action of HCl, HNO3 and H2SO4 acids and ammonia solution. The duty cycle was varied from continuous regime up to 1:10. The plasma treatment duration was 40-120 minutes depending on the material, corrosion kind and duty cycle. The results showed that the application of pulsed discharge regime can conserve the corrosion removal process at lower mean power as well and thus the treated samples were affected by lower heating stress but the process was significantly longer. Our first results demonstrated applicability of the special software commonly used for the photogrammetry as a tool for the surveying of sample surfaces in a microscale.

English abstract

Plasma chemical treatment of archaeological artifacts by RF hydrogen low pressure plasma is a relatively new technique developed during the 1980s. The corrosions as well as their removal are a very complex problem. The mechanism of corrosion removal is not fully understood up to now and thus optimal conditions are not known well. Because each archaeological object is original it is necessary to study the influence of processes and discharge conditions using the model corroded samples. The sample heating due to the interaction with RF field created by plasma as well as heating directly by contact with plasma must be decreased as much as possible to protect the material structure changes. On the other hand, particular power is necessary for the creation of plasma with sufficiently high concentration of reactive particles, mainly of atomic hydrogen. Thus the pulsed discharge should be a best way how to solve these antagonistic tasks. Our study was done using model corrosion samples of iron, copper, bronze and brass prepared by the action of HCl, HNO3 and H2SO4 acids and ammonia solution. The duty cycle was varied from continuous regime up to 1:10. The plasma treatment duration was 40-120 minutes depending on the material, corrosion kind and duty cycle. The results showed that the application of pulsed discharge regime can conserve the corrosion removal process at lower mean power as well and thus the treated samples were affected by lower heating stress but the process was significantly longer. Our first results demonstrated applicability of the special software commonly used for the photogrammetry as a tool for the surveying of sample surfaces in a microscale.

Keywords

corrosion of metals, hydrogen plasma, RF pulsed discharge, photogrammetry, surface analyses

RIV year

2009

Released

07.09.2009

Publisher

FEKT VUT

Location

Brno

ISBN

978-80-214-3793-7

Book

Proceedings of XVIIIth Symposium on Physics of Switching Arc

Pages from

60

Pages to

69

Pages count

10

BibTex


@inproceedings{BUT30595,
  author="František {Krčma} and Věra {Sázavská} and Nikola {Zemánek} and Lucie {Řádková} and Petra {Miková} and Radek {Přikryl} and Osvald {Kozák} and Drahomíra {Janová} and Jitka {Slámová}",
  title="Reduction of Corrosion Layers in Low Temperature Plasma",
  annote="Plasma chemical treatment of archaeological artifacts by RF hydrogen low pressure plasma is a relatively new technique developed during the 1980s. The corrosions as well as their removal are a very complex problem. The mechanism of corrosion removal is not fully understood up to now and thus optimal conditions are not known well. Because each archaeological object is original it is necessary to study the influence of processes and discharge conditions using the model corroded samples. The sample heating due to the interaction with RF field created by plasma as well as heating directly by contact with plasma must be decreased as much as possible to protect the material structure changes. On the other hand, particular power is necessary for the creation of plasma with sufficiently high concentration of reactive particles, mainly of atomic hydrogen. Thus the pulsed discharge should be a best way how to solve these antagonistic tasks. Our study was done using model corrosion samples of iron, copper, bronze and brass prepared by the action of HCl, HNO3 and H2SO4 acids and ammonia solution. The duty cycle was varied from continuous regime up to 1:10. The plasma treatment duration was 40-120 minutes depending on the material, corrosion kind and duty cycle. The results showed that the application of pulsed discharge regime can conserve the corrosion removal process at lower mean power as well and thus the treated samples were affected by lower heating stress but the process was significantly longer. Our first results demonstrated applicability of the special software commonly used for the photogrammetry as a tool for the surveying of sample surfaces in a microscale.",
  address="FEKT VUT",
  booktitle="Proceedings of XVIIIth Symposium on Physics of Switching Arc",
  chapter="30595",
  howpublished="print",
  institution="FEKT VUT",
  year="2009",
  month="september",
  pages="60--69",
  publisher="FEKT VUT",
  type="conference paper"
}