Surface characterization and reactivity of a nitrogen atomized 304L stainless steel powder

Journal Article · Mon Feb 28 23:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02651592· OSTI ID:7274370

Bracconi, P; Gasc, G ^[1]

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1. Univ. of Burgandy, Dijon (France). Lab. for the Reactivity of Solids

The oxide layer on the surface of the particles of a nitrogen atomized 304L stainless steel powder was quantitatively characterized using X-ray photoelectron spectroscopy (XPS), secondary-ion microprobe (IMP) analysis, selective reduction of surface iron oxide by hydrogen, and chemical analysis for total oxygen, all as a function of particle size. The composition and thickness of the oxide layer do not depend significantly on particle size. A 5.8-nm-thick outer layer made of MnO and Fe[sub 2]O[sub 3] islands covers a 2.4-nm-thick inner layer of Cr[sub 2]O[sub 3]. The reaction of the powder with O[sub 2] impurity in either H[sub 2] or N[sub 2] exhibits different kinetics and mechanism in both cases. In H[sub 2], a selective oxidation of the alloying elements Mn, Cr, and Si takes place above 400 C with a parabolic isothermal rate law. In N[sub 2], iron also is oxidized, isolated Fe[sub 2]O[sub 3]-rich microcrystals form over a Cr[sub 2]O[sub 3]-rich uniform underlayer, and the isothermal kinetics are accelerated.

• OSTI ID: 7274370
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:3; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ACTIVATION ENERGY
ALLOYS
AUSTENITIC STEELS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CHROMIUM-NICKEL STEELS
CORROSION PRODUCTS
CORROSION RESISTANT ALLOYS
ENERGY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
IRON OXIDES
KINETICS
LOW CA
MANGANESE COMPOUNDS
MANGANESE OXIDES
MATERIALS
METALLURGY
NICKEL ALLOYS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POWDER METALLURGY
REACTION KINETICS
SILICON COMPOUNDS
SILICON OXIDES
STAINLESS STEEL-304L
STAINLESS STEELS
STEEL-CR19NI10-L
STEELS
TRANSITION ELEMENT COMPOUNDS