Abstract
In this paper we present microhardness measurements of stainless steel surface treated by diffuse discharge in air atmosphere. The cleaning from carbon in comparison to the initial sample was observed at a depth exceeding 20 nm. The oxygen concentration was also increased in comparison to that in the initial sample at a depth of up to about 50 nm. Comparative analysis shows that after treatment the microhardness of stainless steel surface increased in 2 times due to interaction of near-surface layers with product of plasma chemical reactions produced in diffuse discharge.
Highlights
Diffuse discharges with runaway electron preionization have attracted much interest because of the possibilities to uniformly generate rather big volume of plasma in different gases (including electronegative [1]) at atmospheric and elevated pressures [2]
In recent years, diffuse discharges with runaway electron preionization have attracted much interest because of the possibilities to uniformly generate rather big volume of plasma in different gases at atmospheric and elevated pressures [2]
After runaway electrons preionized diffuse discharge (REP DD) treatment, concentration changes of the main chemical elements within the surface layers were studied by Auger electron spectroscopy (AES) with the use of STIL-2 Auger-spectrometer [7]
Summary
Diffuse discharges with runaway electron preionization have attracted much interest because of the possibilities to uniformly generate rather big volume of plasma in different gases (including electronegative [1]) at atmospheric and elevated pressures [2]. REP DD was employed for surface treatment of stainless steel in air atmosphere. The aim of the work to study changes in microhardness of near-surface layer, its roughness characteristics, as well as surface element composition which was occurred under the action of REP DD.
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