ISSN 2594-5327
65º Congresso ABM — vol. 65, num.65 (2010)
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Abstract
The effect of hydrogen on plasma post-oxidation, following plasma nitriding of a ferrous alloy was investigated. The increase of the hydrogen concentration in the plasma reduces progressively the hematite/magnetite concentration ratio in the outermost oxide layer down to zero at 25% H2 concentration. Atomic hydrogen originated from scission of hydrogen molecules in the plasma leads to reduction of Fe(III) in hematite into Fe(II) in magnetite by controlling the gas mixture reduction potential.
The effect of hydrogen on plasma post-oxidation, following plasma nitriding of a ferrous alloy was investigated. The increase of the hydrogen concentration in the plasma reduces progressively the hematite/magnetite concentration ratio in the outermost oxide layer down to zero at 25% H2 concentration. Atomic hydrogen originated from scission of hydrogen molecules in the plasma leads to reduction of Fe(III) in hematite into Fe(II) in magnetite by controlling the gas mixture reduction potential.
Keywords
Plasma post-oxidation; Hydrogen; Magnetite.
Plasma post-oxidation; Hydrogen; Magnetite.
How to refer
Rovani, Ane Cheila;
Cemin, Felipe;
Echeverrigaray, Fernando Graniero;
Basso, Rodrigo Leonardo de Oliveira;
Amorim, Cintia Lugnani Gomes de;
Soares, Gabriel Vieira;
Baumvol, Israel Jacob Rabim;
Figueroa, Carlos Alejandro.
THE INFLUENCE OF HYDROGEN ON PLASMA OXIDATION OF NITRIDED FERROUS ALLOYS
,
p. 4101-4107.
In: 65º Congresso ABM,
Rio de Janeiro,
2010.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-16827
